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    Wyświetlanie 1-45 z 45
    Tytuł:
    Process improvement and kinetic study on copper leaching from low-grade cuprite ores
    Autorzy:
    Bai, S.
    Fu, X.
    Li, C.
    Wen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/109660.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cuprite
    dissolution kinetics
    sulfuric acid leaching
    SCM
    Opis:
    Process improvement and kinetic study on copper leaching from low-grade cuprite ores in sulfuric acid solution are presented in this paper. Effects of major leaching parameters on copper leaching efficiency are determined. The results indicate that copper minerals in the raw ores are mainly cuprites. The reaction rate of this ore increases with an increase in temperature, reaction time, sulfuric acid concentrations and decrease in the particle size of ore. Leaching of about 92.5% of copper is achieved using 0.125-0.074 mm ore particle size at a reaction temperature of 353 K for 180 min reaction time with 150 g/dm3 sulfuric acid. The solid/liquid ratio was maintained constant at 1:15. Leaching kinetic indicates experimental data complies with shrinking core mode (SCM). It is found in the study that agitation rate is not an influential factor on leaching rate and that the dissolution rate is controlled by surface chemical reaction. The average activation energy of the process is determined to be 45.28 kJ mol-1, and the reaction order of H2SO4 is 0.8093.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 300-310
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Copper Leaching from Chalcopyrite: Mechanochemical Approach
    Ługowanie miedz z chalkopirytu – aspekt mechaniczny i chemiczny
    Autorzy:
    Tesinsky, M.
    Balaz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/971182.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    mielenie
    aktywacja mechaniczna
    ługowanie
    chalkopiryt
    milling
    mechanical activation
    leaching
    chalcopyrite
    Opis:
    In the presented work, possibilities of intensification of copper leaching from chalcopyrite CuFeS2 induced by mechanical activation was studied. In this article, the influence of mechanical activation time on copper leaching efficiency is compared. This study also shows how mechanical activation time influences selectivity of copper and iron leaching. For mechanical activation, planetary mill Fritsch Pulverisette 6 at 400 rpm and room temperature was used. Grinding chamber (250 cm3 in volume) and 50 balls (10 mm in diameter) made of tungsten carbide were used. Specifically, the effect of mechanical activation time (4, 20, 30 minutes), the effect of temperature (40, 60, 80°C) on the copper recovery by leaching and the effect of the leaching atmosphere (air, argon) were examined. The results showed that the highest possible recovery of copper from chalcopyrite was obtained after 20 minutes of milling and leached in hydrochloric acid at 80°C, with air atmosphere without any oxidizing reagents.
    W artykule przedstawiono możliwości intensyfikacji procesu ługowania miedzi z chalkopirytu CuFeS2 za pomocą aktywacji mechanicznej. Zbadano wpływ czasu aktywacji mechanicznej na efektywność ługowania miedzi. Wyniki badań pokazały również wpływ czasu na selektywność rozdziału miedzi i żelaza. Do aktywacji mechanicznej wykorzystani młyn planetarny Fritsch Pulverisette 6, aktywację prowadzono przy obrotach 400 rpm, w temperaturze pokojowej. Do badan wykorzystano komorę mielenia o objętości 250 cm3 i 50 kul o średnicy 10 mm wykonanych z węglika wolframu. Określono wpływ czasu aktywacji mechanicznej (4, 20, 30 minut), wpływ temperatury (40, 60, 80°C) na odzysk miedzi w procesie lugowania w atmosferze powietrza i argonu. Wyniki wskazują, że najwyższy możliwy odzysk miedzi z chalkopirytu uzyskano po 20 minutach mielenia i ługowaniu w kwasie solnym w temperaturze 80°C, w atmosferze powietrza, bez jakichkolwiek czynników utleniających.
    Źródło:
    Inżynieria Mineralna; 2017, R. 18, nr 1, 1; 1-5
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on hydrometallurgical processes using nuclear techniques to be applied in copper industry. 2. Application of radiotracers in copper leaching from fl otation tailings
    Autorzy:
    Rogowski, M.
    Smoliński, T.
    Pyszynska, M.
    Brykała, M.
    Chmielewski, A. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/146346.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    flotation waste
    hydrometallurgy
    leaching
    radiotracer
    Opis:
    The use of radiotracers in the present study is intended to replace traditional steps of metal quantitative analysis (solution sampling and instrumental chemical analysis) and to allow real-time measurements of metal concentrations during the leaching process. In this study, 64Cu, an isotope of copper, was selected as a radiotracer. Samples of copper flotation tailings were irradiated in the Maria research reactor (Świerk, Poland) and mixed with an inactive portion of the milled flotation waste. The leaching process was carried out in a glass reactor, and the radiation spectrum was measured using a gamma spectrometer. The material was then treated using various acids (sulphuric acid, nitric acid, acetic acid, citric acid, and ascorbic acid) in a wide range of their concentrations. Experiments with the radiotracer were conducted in sulphuric and nitric acids. The amount of the leached metal (copper) was calculated on the basis of the peak area ratio in the gamma-ray spectrum of the activated tailings and standard samples. Inductively coupled plasma mass spectrometry (ICP-MS) was also used to analyse the metal content. Maximum recovery of 56% Cu was achieved using 9 M HNO3, whereas the recovery was lowest for ascorbic acid (1%). Both analytical methods were compared, and the results presented in this paper are in good agreement with radiometric measurements obtained using ICP-MS analysis.
    Źródło:
    Nukleonika; 2018, 63, 4; 131-137
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thiosulfate-copper-ammonia leaching of pure gold and pressure oxidized concentrate
    Autorzy:
    Porvali, A.
    Rintala, L.
    Aromaa, J.
    Kaartinen, T.
    Forsen, O.
    Lundstrom, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/110672.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    gold leaching
    thiosulfate
    quartz crystal microbalance
    Opis:
    In this research cyanide-free leaching of pure gold and pressure oxidized refractory gold concentrate by thiosulfate-copper-ammonia solutions were examined. A quartz crystal microbalance (QCM) was used to study gold leaching as a factorial series where the best gold leaching rate (2.987 mg/(cm2∙h)) was achieved with a solution consisting of 0.2 M (NH4)2S2O3, 1.2 M NH3, 0.01 M CuSO4 and 0.4 M Na2SO4. Temperature had the greatest effect on the gold leaching rate. An increase in thiosulfate concentration (0.1–0.2 M) increased gold dissolution. The combined effect of temperature and ammonia concentration had a statistically significant effect on the gold leaching rate at 0.1 M M2S2O3. Combination of applied potential and NH3:S2O3 ratio had a statistically significant effect on the gold leaching rate at 0.2 M M2S2O3. An increase in applied potential decreased the gold dissolution rate at low ammonia concentrations but increased it at high concentrations. A pressure oxidized gold concentrate was leached for 6 hours in the batch reactor leaching experiments. The effect of rotative velocity (1.26–1.56 m/s) and slurry density (10–30 wt%) was investigated at the following leaching parameters: 0.2 M Na2S2O3, 0.6 M NH3, 0.01 M CuSO4, 0.4 M Na2SO4. Lower slurry density (10 wt%) resulted in a higher Au leaching efficiency. An increase in the rotation rate did not have an effect on the final Au leaching recovery. The best Au leaching efficiency (89%) was achieved with 590 rpm mixing, 1.56 m/s rotative velocity and 10 wt% slurry density.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1079-1091
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laccase treatment of Norway spruce wood surface improves resistance and copper fixation of treated wood
    Autorzy:
    Vaukner Gabric, M.
    Boncina, T.
    Humar, M.
    Pohleven, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/52295.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    laccase
    treatment
    Norway spruce
    Trametes versicolor
    wood surface
    wood decay
    resistance
    copper leaching
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2016, 59, 198
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contaminants of post-leaching copper solutions and their behavior during extraction with industrial extractants
    Autorzy:
    Gotfryd, L.
    Pietek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/109816.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    industrial copper extractants
    copper contaminants
    copper extraction isotherms
    Opis:
    Several copper extractants have been examined in laboratory glassware with a special attention paid to their behavior towards cations others than copper(II). In the studies 25 vol. percent of hydrocarbon (Exxsol D80 AZ) solutions of six industrial copper extractants have been used. They were mainly rea-gents of hydrooxime type (LIX 860N-IC, LIX 984, LIX 984N, LIX 84-I, Acorga M5640) and diketone type LIX 54-100. Individual isotherms of independent extraction of copper(II) and selected cations (Fe3+, Fe2+, Co2+, Ni2+, Zn2+, Mn2+, Cd2+, Mg2+) versus equilibrium pH have been compared. Investigations have been conducted with synthetic 0.1 mol/L solutions of their sulfates. The values of pH50% − parameter defined as an equilibrium pH at the moment of half-and-half extraction of the investigated cationic spe-cies have been presented. Also ΔpH50%, that is differences between values of pH50% for specific cation Me(II) and copper(II): ΔpH50% = pH50%(Me) − pH50%(Cu), have been given. In addition to that 25% LIX 984 has been used in counter-current pilot trials for copper(II) extraction from naturally contaminated solutions produced by bioleaching of industrial sulfide copper concentrate to observe behavior of investi-gated contaminants such as correlations between their real co-extraction with copper(II) and the position of their extraction on the pH scale. Copper electrolyte/strip solution, working alternately within close loop of coupled stripping - electrowinning system, has been analyzed during consecutive cycles to observe building up of the contaminants concentrations in the course of test.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 1; 133-143
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on hydrometallurgical processes using nuclear techniques to be applied in copper industry. I. Application of 64Cu radiotracer for investigation of copper ore leaching
    Autorzy:
    Smoliński, T.
    Rogowski, M.
    Brykała, M.
    Pyszynska, M.
    Chmielewski, A. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/147894.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    copper ore
    hydrometallurgy
    leaching
    NAA
    Opis:
    Scientific objective of this work was elaboration of radiometric method for the development of hydrometallurgical process for recovery of Cu from the copper ore. A neutron activation analysis (NAA) was identified as a very convenient tool for the process investigation. The samples of copper ore were activated in a nuclear reactor. The parameters of the neutron activation were calculated. Radioisotope 64Cu was selected as an optimal tracer, and it was used for the investigation of the leaching process. During the experiments, various processes applying leaching media such as sulphuric acid, nitric acid, and organic acids were investigated. The recovery of the metals using sulphuric acid was insufficient, around 10%. Investigated organic media also did not meet expectations. The best results were obtained in experiments with nitric acid. Up to 90% of Cu and other metals were extracted from the copper ore. Copper concentration calculations obtained by NAA were confimed by inductively coupled plasma mass spectrometry (ICP-MS) technique. Both techniques gave comparable results, but the advantage of the NAA is a possibility for easy online measurements without shutting down or disturbing the system.
    Źródło:
    Nukleonika; 2018, 63, 4; 123-129
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selective leaching of copper from near infrared sensor-based preconcentrated copper ores
    Autorzy:
    Ambo, Amos Idzi
    Iyakwari, Shekwonyadu
    Glass, Hylke J
    Powiązania:
    https://bibliotekanauki.pl/articles/1449474.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    near infrared
    leaching
    pre-concentration
    ore characterization
    copper
    Opis:
    Copper oxide ore was pre-concentrated using near infrared sensor-based method and classified as product, middling and waste. The product and middling fractions were leached with ammonium chloride reagent. The effect of temperature, ammonium chloride concentration, solid- liquid ratio, stirring speed and particle size experimental variables were investigated. Mineralogical and chemical analysis of the ore fractions indicated that copper content was in accordance with the preconcentration strategy, with the product having a higher concentration than the middling and waste. The rate of copper extraction was found to be higher in the product than in the middling sample which further supports the near infrared classification, QEMSCAN®, X-ray diffraction, SEM mineralogical and X-ray florescence and Inductively coupled plasma Mass spectrometry chemical data. It was revealed that the leaching rate increases with increasing ammonium chloride concentration, temperature and decreasing ore particle size, stirring speed and solid-liquid ratio. Analysis of the experimental data by shrinking core model indicated that the dissolution kinetics follow the heterogeneous reaction model for the chemical control mechanism where the activation energies of 45.9 kJ/mol and 47.5 kJ/mol for product and middling fractions respectively were obtained. Characterization of the residue obtained at optimum leaching condition with X-ray diffraction suggests that copper was selectively leached when compared to the profile of the raw ore. The trace levels of metals associated with abundant X-ray diffraction profiles of residue found in the leachate further confirm the selective leaching process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 1; 204-218
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leaching kinetics of copper from chalcopyrite concentrate in nitrous-sulfuric acid
    Autorzy:
    Gok, O.
    Anderson, C. G.
    Cicekli, G.
    Cocen, E. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/109914.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chalcopyrite
    pressure leaching
    nitrogen species
    kinetics
    Opis:
    Treating chalcopyrite flotation concentrates by hydrometallurgical techniques seems to be the most convenient method for leaching copper due to concerns over air pollution and regulations regarding the emission of sulfur dioxide that result from smelting. In this study, the leaching recovery-time trajectories of bulk chalcopyrite concentrate obtained from a flotation plant in the Kastamonu region of Turkey are presented. The effects of various parameters were elucidated in the nitrous-sulfuric acid electrolyte (CNaNO2:0.05 M–0.15 M, CH2SO4:1 M) at a moderate temperature (80–120 °C). A high level of copper recovery (98%) from bulk chalcopyrite concentrate was obtained under a total pressure of 6 atm at 120°C within 2 h when using small amounts of nitrite species due to their autocatalytic behavior in acidic solutions. The kinetics were well correlated with the shrinking core model for the diffusion controlled mechanism with an apparent activation energy of 34.06 kJ·mol–1. Elemental sulfur was the primary leaching product on the mineral surface, as confirmed using XRD and SEM/EDX. The semi-empirical equation explaining the reaction rate under the present conditions was expressed as follows: ...[wzór].
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 399-413
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of the Effectiveness of Biological and Chemical Leaching of Copper, Nickel and Zinc from Circuit Boards
    Autorzy:
    Andrzejewska-Górecka, Dorota Anna
    Poniatowska, Agnieszka
    Macherzyński, Bartłomiej
    Wojewódka, Dominik
    Wszelaka-Rylik, Małgorzata Edyta
    Powiązania:
    https://bibliotekanauki.pl/articles/124999.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    bioleaching
    chemical leaching
    e-waste
    PCBs
    heavy metals
    Opis:
    The progress of civilization brings with it the development of advanced technologies and increased demand for electric and electronic equipment. That directly influences the increase of produced e-waste, called Waste of Electrical and Electronic Equipment (WEEE). Due to the fact that deficit and critical metals are running out throughout the World, and due to increased demand for those metals, their alternative source and recovery methods have to be found. As an alternative biotechnological methods can be used. The advantage of biological methods over chemical processes is its selectivity in regard to different metal groups, simplicity of technological process, economic effectivity (lower energy expenditure) and lack of negative impact on environment. The aim of this work was to compare the effectiveness of biological and chemical leaching of copper (Cu), nickel (Ni) and zinc (Zn) from circuit boards (PCBs).The experiment was conducted in variants which included factors such as temperature (24°C and 37°C) and speed of mixing. In case of all metals higher effectiveness was achieved in variants conducted in the temperature of 24°C and faster mixing than in temperature of 37°C and slower mixing. In case of cooper and zinc better results of metal removal were achieved in bioleaching variant. In case of nickel faster result of metal removal were achieved in chemical leaching, but at the end of the experiment the effectivity of chemical leaching and biological leaching was similar. The maximum efficiency of cooper, nickel and zinc release was adequately 100%, 90%, 65%.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 9; 62-69
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chloride leaching of silver and lead from a solid residue after atmospheric leaching of flotation copper concentrates
    Autorzy:
    Chmielewski, T.
    Gibas, K.
    Borowski, K.
    Adamski, Z.
    Wozniak, B.
    Muszer, A,
    Powiązania:
    https://bibliotekanauki.pl/articles/109629.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    copper concentrate
    atmospheric leaching
    chloride leaching
    silver
    lead
    Opis:
    Recovery of silver and lead by means of chloride leaching of solid residue after atmospheric leaching of the copper concentrate from Lubin Concentrator (KGHM) was investigated. The effect of leaching temperature, chloride concentration, Fe(III) and oxygen presence, solid-to-liquid ratio and feed preleaching with NaOH on the silver and lead recovery was analyzed. Chloride leaching appeared to be very effective for recovery of lead, whereas satisfactory recovery of silver was observed after chemical pretreatment of the leaching feed with alkali solution of NaOH in order to liberate Ag entrapped in the jarosite structure. It was found that to achieve the satisfactory recovery of Ag and Pb leaching had to be performed in acidified 4 M chloride concentration at temperature of 90 oC. The presence of oxidants, that is O2 and iron(III) ions, was beneficial in the initial stage of the process. The maximum recovery of Ag and Pb was found for the solid-to-liquid ratio of 1:10 after 10 hours leaching.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 893-907
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thiosulfate leaching of silver from a solid residue after pressure leaching of industrial copper sulfides flotation concentrates
    Autorzy:
    Wejman-Gibas, K.
    Chmielewski, T.
    Borowski, K.
    Gibas, K.
    Jeziorek, M.
    Wodka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/109947.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    atmospheric leaching
    silver
    sodium thiosulfate
    ammonia
    Lubin copper concentrate
    Opis:
    Hydrometallurgical recovery of silver from a solid residue after pressure leaching of a flotation copper concentrate from the Lubin Concentrator (KGHM Polska Miedz S.A.) was investigated. Thiosulphate leaching was examined with regard to the highest possible leaching efficiency and optimization process parameters. The effect of thiosulfate ions concentration within the range from 0.25 to 1.00 mol/dm3 at a constant ammonia concentration, and ammonia concentration within the range from 0.40 to 1.00 mol/dm3 at a constant thiosulfate concentration on leaching recovery of selected metals were examined. Moreover, the effect of copper(II) ions addition on silver leaching was studied. It was shown that the leaching recovery of silver increased with increasing thiosulfate and ammonia concentration. At the highest thiosulfate ions concentration, the observed silver leaching recovery was 60%. The best results were obtained at an ammonia concentration of 0.80 mol/dm3, where the leaching recovery of Ag reached 75%. It was established that addition of Cu(II) did not affect silver leaching. Nearly 100% efficiency of thioslulohate silver leaching was achieved by pretreatment of the solid residue after pressure leaching with NaOH solutions.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 601-610
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ utleniacza na ługowanie ołowiu z koncentratu miedziowego
    The effect of oxidant on leaching lead from copper concentrate
    Autorzy:
    Sanak-Rydlewska, S.
    Bieszczad, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/318797.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    koncentrat miedziowy
    obróbka chemiczna
    zawartość ołowiu
    ługowanie
    copper concentrate
    chemical treatment
    lead content
    leaching
    Opis:
    W artykule podano wyniki doświadczeń laboratoryjnych ługowania ołowiu z koncentratu miedziowego za pomocą octanu amonu. Przebadano wpływ dodatku nadtlenku wodoru do roztworu ługującego na stopień ługowania ołowiu z koncentratu. Proces prowadzono przez 60 minut w temperaturze 293 K, stosując roztwory octanu amonowego o stężeniu 10% i 40% wagowych.
    This article presents results of laboratory experiments of leaching lead from copper concentrate with ammonium acetate. The effect of addition of hydrogen peroxide to the leaching solution on the rate of lead leaching from copper concentrate was studied. The process was carried out for 60 minutes at 293 K, in 10 and 40 percent (by weight) ammonium acetate solutions.
    Źródło:
    Inżynieria Mineralna; 2001, R. 2, nr 1, 1; 35-39
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ługowanie miedzi i cyny z odpadów elektronicznych za pomocą bakterii Acidithiobacillus ferrooxidans
    Leaching of copper and tin from electronic waste using Acidithiobacillus ferrooxidans
    Autorzy:
    Blazek, V.
    Zavada, J.
    Bouchal, T.
    Lebr, J.
    Fecko, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/318276.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    odpad elektroniczny
    ługowanie bakteryjne
    Acidithiobacillus ferrooxidans
    electronic waste
    leaching
    bacterial leaching
    Opis:
    Określono efekt ługowania metali z odpadów elektronicznych przy użyciu bakterii Acidithiobacillus ferrooxidans w warunkach statycznych. Zbadano ługowanie miedzi i cyny z płytki drukowanej układu elektronicznego i porównano do ługowania chemicznego. Całkowita ilość usuniętych metali była nieco mniejsza we wszystkich przypadkach. Dodatek bakterii ulepszył proces ługowania miedzi, jednak porównywalne rezultaty otrzymano poprzez dodanie mineralnej pożywki nie zawierającej bakterii. Ługowanie cyny przebiegało w inny sposób, a obecność bakterii nie polepszyła wydajności procesu.
    This contribution is focused on the leaching of metals from electronic waste using bacterium Acidithiobacillus ferrooxidans under static conditions. Leaching of copper and tin from circuit board using bacteria was verified and compared to chemical leaching. The overall amounts of leached metals were quite low in all variants. Addition of bacteria improved the leaching of copper; however comparable results were obtained by addition of the sole nutrient medium without bacteria. Leaching of the tin followed different pattern and was not improved by presence of bacteria.
    Źródło:
    Inżynieria Mineralna; 2012, R. 13, nr 1, 1; 1-7
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recovery of cobalt and nickel by atmospheric leaching of flotation sulfide concentrate from lubin concentrator
    Autorzy:
    Gibas, K.
    Borowski, K.
    Chmielewski, T.
    Wejman, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/951849.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    atmospheric leaching
    cobalt
    nickel
    sulphuric acid
    Lubin copper concentrate
    Opis:
    An experimental study on leaching of cobalt and nickel from a Lubin (Poland) sulfide flotation copper concentrate with oxygenated sulphuric acid solution in the presence of iron(III) sulfate is presented. The effect of temperature, iron(III) concentration, initial sulphuric acid concentration, oxygen flow rate and chloride ions addition on cobalt and nickel leaching were examined. The obtained results show, that enhancing investigated leaching parameters increases both the rate and leaching recovery of nickel and cobalt. The effect of iron(III) ions concentration is particularly significant. Additionally, a significant correlation between copper and nickel/cobalt leaching recovery was observed. Due to the fine dissemination of nickel and cobalt, they were leached remarkably faster when copper leaching recovery exceeded 90%.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 1; 191-203
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of Increasing the Recovery of Non-Ferrous Metals From the Low-Grade Copper-Nickel Ores for Heap Leaching
    Metody zwiększenia odzysku metali nieżelaznych z niskiej jakości rudy miedziowo niklowej przed ługowaniem na hałdzie
    Autorzy:
    Svetlov, A.
    Makarov, D.
    Pripachkin, P.
    Usov, A.
    Potokin, A.
    Goryachev, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/318351.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    surowce naturalne i antropogeniczne zawierające siarczki
    metale nieżelazne
    rozdrabnianie impulsami elektrycznymi
    natural and anthropogenic sulphide-containing raw materials
    non-ferrous metals
    electric pulse destruction
    Opis:
    The paper discusses two methods of ore pre-treatment. In the first case, ore crushing with sulfuric acid agglomeration was applied and followed heap leaching was applied. The second method involved electropulse destruction of pre-crushed ore, and then the heap leaching was performed.
    W pracy omówiono dwie metody wstępnej przeróbki rudy o niskiej zawartości miedzi i niklu. W pierwszym wariancie zastosowano przygotowanie rudy przy użyciu kwasu siarkowego i kolejno ługowanie na hałdzie. Drugi wariant polegał na obróbce wstępnie rozdrobnionej rudy w separatorze elektrycznym a następnie ługowanie na hałdzie.
    Źródło:
    Inżynieria Mineralna; 2018, R. 19, nr 1, 1; 173-177
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of lead nitrate and pre-aeration on the deportment of base/precious metals in cyanide leaching of a pyritic refractory gold concentrate
    Autorzy:
    Hacı, Deveci
    Ersin, Yener Yazıcı
    Oktay, Celep
    Murat, Mercimek
    Cumhur, Demirel
    Serkan, Çakmak
    Melih, Baki Cingöz
    Ömer, Hami Kavlu
    Hüseyin, Kömürcü
    Powiązania:
    https://bibliotekanauki.pl/articles/24085578.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    gold
    cyanide leaching
    pyrite
    copper
    refractory ore
    lead nitrate
    Opis:
    This study was undertaken to improve gold and silver extraction from a pyritic gold flotation concentrate, which assayed 11 g/t Au, 42 g/t Ag, 0.21% Cu, 3.57% Zn, and 31% Fe. Direct cyanide leaching of the concentrate at 1.5 g/L NaCN yielded a low gold extraction (37%), confirming its refractory nature. Effects of lead nitrate (200-500 g/t Pb(NO3)2) and pre-aeration (24 h) before cyanide leaching at 1.5-3.5 g/L NaCN were investigated. Earlier studies have focused on the impact of these parameters on gold leaching. Besides gold, this study demonstrated the behaviour of silver and base metals (copper and zinc) from the pyritic gold concentrate. Adding lead nitrate had a negligible effect on gold extraction whilst improving silver extraction. Dissolution of copper was substantially suppressed by adding lead nitrate, i.e., from 23% (no Pb(NO3)2) to 4% (500 g/t Pb(NO3)2) over 24 h. Zinc dissolution was negligible (≤0.01%). Pre-aeration of the concentrate improved the gold and silver extractions by 4-14% and 23-44% at the subsequent cyanide leaching (1.5-3.5 g/L NaCN). However, it did not affect the leaching of copper. Only negligible leaching of zinc (≤0.6%) occurred during cyanide leaching. Pre-aeration also reduced cyanide consumption in subsequent cyanide leaching (1.5 g/L NaCN), i.e., from 2.83 kg/t to 2.03 kg/t NaCN per solids. These results suggested that lead nitrate can improve silver extraction while suppressing copper dissolution, which would be advantageous in the leaching-adsorption circuit (CIP), mitigating the dissolved copper-associated problems. Pre-aeration can also be suitable for improved gold/silver extractions and reduced reagent consumption.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 166259
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recovery of copper from smelting slag by sulphation roasting and water leaching
    Autorzy:
    Dimitrijevic, M. D.
    Urosevic, D. M.
    Jankovic, Z. D.
    Milic, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/110627.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    copper
    slag
    sulphation
    roasting
    acid baking
    leaching
    Opis:
    In this work extraction of copper and iron from a reverberatory furnace slag was studied. A two-step extraction procedure was followed. The first step was roasting of the slag in the presence of sulphuric acid at temperatures between 150 and 800oC. The second step was leaching of the resulting calcine with distilled water. The maximum copper extraction of about 94% was achieved. In this case, the slag was roasted at 250oC with sulphuric acid higher of about 33% than that stoichiometrically required, followed by water leaching of calcine at 50oC. About 55% of iron was also dissolved under these conditions. On the other hand, for the calcine obtained at sulphation temperature of 600oC, extraction of copper in a water leaching stage was still relatively high (about 79%), whereas that of iron was comparatively low (about 6%). Dissolution of copper and iron from the calcine was found to be very fast and was complete within the first few minutes. The water temperature in the leaching step was found to have no effect on extraction of copper and iron from the calcine in the range of 30 to 85oC.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 409-421
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure leaching of sulfide concentrate produced by Lubin Concentrator (KGHM Polska Miedz SA, Poland)
    Autorzy:
    Matuska, S.
    Ochromowicz, K.
    Chmielewski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/110420.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydrometallurgy
    copper concentrates
    pressure leaching
    Opis:
    The rapidly declining quality of ores and concentrates produced by Lubin Concentrator (KGHM) makes the flotation concentrates exceptionally difficult-to-process by flash smelting. Currently, a hydrometallurgical process, using sulfuric acid with the presence of oxidants as a leaching medium, seems to be either a reasonable alternative or a complementary option to pyrometallurgy. The unique lithological, mineralogical and chemical properties of the concentrate were considered in a selection of the process route. Results of a pressure leaching of the copper sulfide concentrate from Lubin Concentrator (ZWR Lubin) with oxygenated aqueous H2SO4 solutions are presented. The effect of temperature from 120 to 200 °C, initial concentration of H2SO4 from 60 to 100 g/dm3, and oxygen partial pressure ranging from 0.5 to 2.0 MPa were investigated. The pressure leaching appeared to be an efficient process for recovering copper from the Lubin concentrate. At optimal leaching conditions (140 °C, 100 g/dm3 H2SO4, 1.0 MPa O2) 96% of Cu was extracted after 4 h.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 781-792
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leaching of High Arsenic Content Dust and a New Process for the Preparation of Copper Arsenate
    Autorzy:
    Sheng, W.
    Shen, Y.-Y.
    Sheng-Quan, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/355005.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-arsenic dust
    acidic leaching
    alkaline leaching
    copper arsenate
    comprehensive utilisation of esources
    Opis:
    In this research, the high arsenic content dust of copper smelting, as a raw material, the extraction of copper and arsenic from the high arsenic content dust in the leaching system containing acidic and alkaline compounds was investigated. Meanwhile, the effects of acid/alkaline initial concentration, liquid to solid ratio, leaching temperature, leaching time on the leaching rate of copper and arsenic were studied. The optimum conditions for the leaching of high arsenic content dust and preparation of copper arsenate were determined. The results showed that acidic/alkaline leaching of high arsenic content dust was particularly effective. 93.2% of the copper, and 91.6% of the arsenic were leached in an acidic leaching process and 95% of the arsenic, while less than 3% of the copper, less than 5% of the antimony, less than 2% of the bismuth was also leached in an alkaline leaching process. A new method (the parallel flow drop precipitate method) was developed in the synthesis of copper arsenate process. The parallel flow drop method was employed to adjust the molar ratio (copper to arsenic) of the mixed solution of the acid-leaching solution and the alkali-leaching solution by taking the drop acceleration of an acidic leaching solution and an alkaline leaching solution at 10 mL/min and 12 mL/min, at a temperature of 60°C and a reaction time of 1h. Copper arsenate was prepared by mixing an acidic leaching solution and an alkaline leaching solution. The main phases of copper arsenate were CuHAsO4·1.5H2O and Cu5As4O15·9H2O. Copper arsenate contained 30.13% copper and 31.10% arsenic.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1167-1172
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response surface methodology (RSM) for optimization of chalcopyrite concentrate leaching with silver-coated pyrite
    Autorzy:
    Salehi, S.
    Noaparast, M.
    Shafaei, S. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/110894.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chalcopyrite
    copper extraction
    silver-coated pyrite
    optimization
    response surface methodology
    Opis:
    This study aims to leach copper from chalcopyrite and optimizing the leaching process, using the response surface methodology (RSM). The RSM, a D-optimal design with four factors in three levels was employed to evaluate the effect of particle size, temperature, silver-coated pyrite to chalcopyrite ratio and redox potential parameters on the copper extraction efficiency. A quadratic model was then proposed by the RSM to correlate leaching variables. The tests results indicated that the model was significant with the experimental data at a correlation coefficient (R2) of 0.96. The most important parameters of copper extraction efficiency were particle size and silver-coated pyrite-to-chalcopyrite ratio, and also the squared term of particle size (A2), temperature (B2) and redox potential (D2). In addition, the interaction between redox potential and silver-coated pyrite-to-chalcopyrite ratio (CD) was significant. It was shown that the finer the particle size the faster the leaching rate of copper. It was also indicated that by increasing silver-coated pyrite to chalcopyrite ratio of 6:1 copper recovery increased. The maximum recovery of copper (71%) was obtained for the particle size of -38 μm, 70 °C, 420 mV of redox potential, silver-coated pyrite-to-chalcopyrite ratio of 6 and leaching time of 8 hours.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 1023-1035
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recovery of copper from copper slag and copper slag flotation tailings by oxidative leaching
    Autorzy:
    Urosevic, D. M.
    Dimitrijevic, M. D.
    Jankovic, Z. D.
    Antic, D. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/109899.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    copper slag
    copper slag flotation tailings
    leaching
    sulphuric acid
    ferric sulphate
    hydrogen peroxide
    Opis:
    Copper smelter slag and copper smelter slag flotation tailings were leached using sulphuric acid solutions, without or with the addition of either ferric sulphate or hydrogen peroxide. Copper extraction from the slag was typically found to be twice as high as that from the slag flotation tailings. Hydrogen peroxide was determined to be the best lixiviant. Thus, copper and iron extractions were 63.4% and 48.6%, respectively, when leaching the slag with 3 M H2O2, after 120 minutes of reaction at room temperature. Copper dissolution was generally found to be the dominant process within the first 60 minutes of reaction, whereas iron dissolution dominated afterwards.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 1; 73-82
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Copper Extraction from Complex Waste Dumps by Biochemical Leaching Method
    Autorzy:
    Koizhanova, Aigul
    Magomedov, David
    Abdyldayev, Nurgali
    Kamalov, Emil
    Yerdenova, Maria
    Bakrayeva, Akbota
    Powiązania:
    https://bibliotekanauki.pl/articles/2202181.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    copper dump
    bio-oxidation
    Acidobacillus Ferrooxidans bacteria
    leaching
    Opis:
    The article presents the research results for the effectiveness of copper extraction from ores of the Satpayev deposit with complex, mixed composition bacterial leaching. The experiments with pre-acidification of copper samples were performed using biological oxidation by A. Ferrooxidans bacterial culture, adapted strain. Biochemical opening moes of mineral raw materials using A. Ferrooxidans bacteria of a particular strain adapted to the copper waste composition and capable of oxidizing sulfide and iron-bearing minerals were worked out. The optimal growth conditions for microorganisms in copper mineral pulp medium were established (temperature, pH, S: L.) The highest leaching efficiency, up to 88.65%, was observed in the experiments with preliminary bio-oxidation of samples by A. Ferrooxidans bacterial culture.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 10; 283--290
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal pH for Heap Leaching of Low Grade Copper-Cobalt-Iron Ore
    Optymalne pH dla ługowania zwałów rudy o niskiej jakości miedzi, kobaltu i żelaza
    Autorzy:
    Mweene, L.
    Kawala, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/318618.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    raffinate
    leaching
    gangue
    silica
    pH
    rafinacja
    ługowanie
    skała płonna
    krzem
    Opis:
    Acid heap leaching is a metal extraction process from low grade ores normally 1-2% oxidised valuable mineral using a leachant (e.g. concentrated sulphuric acid (H2SO4). The ore is crushed, cured, agglomerated and stacked on an impermeable pad. Raffinate dosed with concentrated sulphuric (H2SO4) acid is sprayed on the stacked ore to produce a pregnant leach solution. Though cheap the process maybe, it is affected by the pH of the leaching liquor, nominal crushing size, temperature, optimal stacking height, irrigation rate, solid-to-liquid ratio, permeability, gangue minerals, temperature, nominal crush size, ore particle size distribution affect. The aim of this paper is to investigate the most effective raffinate pH for leaching out copper and cobalt from low grade ore. The ore contains malachite (Cu2(CO3) (OH)2), cobalt oxide, hematite (Fe2O3) and about 94 wt. % gangue mineral (CaCO3, CaO and SiO2)content. CaO is highly soluble in acid and SiO2 is also soluble in acid when presence in the form complex compounds such as calcium silicate (CaSiO3, Ca2SiO4) or feldspar (KAlSi3O8) and hence they significantly interfere the heap leaching process. In order to analyse the optimal pH, three samples of different composition were used in our experiments. The samples were ground to a particle size of ≤ 50mm, cured and agglomerated before leaching with the raffinate solution containing Ca2+(12.095%), Fe3+(0.158%), Cu2+ (0.1185%), and Co2+(0.216%) from the solvent extraction dosed with concentrated sulphuric (H2SO4) acid (98%) at different pH ranges (0.3-0.4, 0.54-0.6 and 0.7-1). The effect of the raffinate pH was analyzed by leaching the samples at different pH (0.3-0.4, 0.54-0.6 and 0.7-1) and analyzing the solution and the leach residue via atomic absorption spectrometry (AAS) technique. The one treated at a pH range of 0.54-0.6 yielded the highest concentration of copper (24gpl), cobalt (0.28gpl) and iron (3.65gpl) in the pregnant leach solution and the highest recovery of copper(42.23%), cobalt (21.90%) and iron (47.87%).The leach residue for sample 1 treated with leaching liquor (pH 0.3-0.4) were Cu2+ (0.50%), Fe3+ (1.12%), Co2+ (0.354%) and Ca2+ (0.057%). The leaching residue for sample 2 treated with leaching liquor (pH 0.54-0.6) were Cu2+(0.065%), Fe3+(0.057%), Co2+(0.27%), Ca2+(0.097%) and SiO2(0.31%).The leach residue for sample 3 treated with leaching liquor (pH 0.7-1) were Cu2+ (0.24%), Fe3+ (0.31%), Co2+ (0.31%), Ca2+ (0.25%) and SiO2(0.64%). Since almost all silica was consumed by the leaching liquor in sample 1, more silicic acid was produced as shown in equation (1) which decomposed in equation (2) to produce silica gel. The silica gel reduced the permeability of the leaching liquor by preventing it from reacting with the entire ore leading to less concentrations and recoveries of the valuable (Cu, Co and Fe). The experimental results were compared with the thermodynamic prediction from the FactSage software. [formula]
    Kwaśne ługowanie zwału jest procesem ekstrakcji metali z rud o niskiej klasie zazwyczaj 1-2% utlenionego wartościowego minerału przy zastosowaniu ługowania (na przykład stężonym kwasem siarkowym (H2SO4). Rudę kruszy się, konserwuje, aglomeruje i umieszcza na nieprzepuszczalnej podkładce. Rafinat dozowany ze stężonym kwasem siarkowym (H2SO4) jest natryskiwany na ułożoną rudę w celu wytworzenia macierzystego roztworu ługu. Chociaż sposób ten może być tani, to zależy on od pH roztworu ługującego, nominalnej wielkości kruszca, temperatury, optymalnej wysokości spiętrzania, stopnia irygacji, stosunek ciała stałego do cieczy, przepuszczalności, skały płonnej, temperatury, nominalnej wielkości zgniatania, wpływu rozkładu wielkości cząstek rudy. Celem niniejszej pracy jest zbadanie najbardziej efektywnego pH rafinatu do wypłukiwania miedzi i kobaltu z rud niskiej jakości. Ruda zawiera malachit (Cu2(CO3) (OH)2), tlenek kobaltu, hematyt (Fe2O3) i około 94% wag. zawartości skały płonnej mineralnej (CaCO3, CaO i SiO2). CaO jest wysoce rozpuszczalny w kwasie i SiO2 jest również rozpuszczalny w kwasie, jeśli jest obecny w formie związków kompleksowych, takich jak krzemian wapnia (CaSiO3, Ca2SiO4) lub skaleń (KAlSi3O8), a tym samym może znacznie zakłócić proces ługowania zwału. W celu analizy optymalnej wartości pH, w eksperymencie zostały użyte trzy próbki o różnej kompozycji. Próbki zostały zmielone do rozmiaru ≤ 50mm, zakonserwowane i aglomerowane przed ługowaniem w roztworze rafinatu zawierającym Ca2+(12,095%), Fe3+(0,158%), Cu2+ (0,1185%), oraz Co2+ (0,216%) pochodzącym z ekstrakcji rozpuszczalnikowej dawkowanej ze stężonym kwasem siarkowym (98%) w różnych zakresach pH (0,3-0,4, 0,54-0,6 oraz 0,7-1). Wpływ pH rafinatu był analizowany przez ługowanie próbek o różnym pH (0,3-0,4, 0,54-0,6 oraz 0,7-1) i analizę roztworu a także pozostałości ługu za pomocą techniki absorpcyjnej spektroskopii atomowej (ASA). Próbka, którą traktowano roztworem o zakresie pH 0,54-0,6 wykazała najwyższe stężenie miedzi (24gpl), kobaltu (0,28gpl) i żelaza (3,65gpl) w macierzystym roztworze ługu i największy odzysk miedzi (42,23%), kobaltu (21,90%) i żelaza (47,87%). Pozostałość ługu dla próbki 1 traktowana płynem ługującym (pH 0,3-0,4) miała Cu2+ (0,50%), Fe3+(1,12%), Co2+ (0,354%) oraz Ca2+ (0,057%). Pozostałość z ługowania dla próbki 2 traktowana cieczą ługującą (pH 0,54-0,6) miała Cu2+ (0,065%), Fe3+(0,057%), Co2+ (0,27%), Ca2+ (0,097%) oraz SiO2 (0,31%). Pozostałość ługu dla próbki 2 traktowana płynem ługującym (pH 0,7-1) zawierała Cu2+ (0,24%), Fe3+ (0,31%), Co2+ (0,31%), Ca2+ (0,25%) oraz SiO2 (0,64%). Ponieważ prawie cała krzemionka została zużyta przez płyn ługujący w próbce 1, większość kwasu krzemowego została wytworzona jak przedstawiono w równaniu (1), który rozkłada się w równaniu (2), z wytworzeniem żelu krzemionkowego. Żel krzemionkowy zmniejsza przepuszczalność cieczy ługującej, zapobiegając przed reakcją z całą rudą, co prowadzi do mniejszych stężeń i odzyskiwania wartościowych Cu, Co i Fe. Wyniki doświadczalne porównano z prognozami termodynamicznymi z oprogramowania FactSage. [wzór]
    Źródło:
    Inżynieria Mineralna; 2014, R. 15, nr 2, 2; 83-88
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization of polymeric binders to agglomerate oxidized copper ore
    Autorzy:
    Kiaei, Kimia
    Golpayegani, Mohammad Hasan
    Powiązania:
    https://bibliotekanauki.pl/articles/27323657.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    heap leaching
    permeability
    agglomeration
    polymeric compounds
    copper ore
    Opis:
    Permeability reduction is a major challenge in heap leaching, primarily caused by the accumulation of fines that move with the leaching agent, leading to the formation of dead zones and channeling within the heap. In the Aria copper beneficiation plant, the 0–2 mm fraction with a copper grade of 1.4% undergoes pre-separation prior to heap loading without further processing. This study investigated the potential of using the agglomeration method to improve permeability in the case of using the 0–2 mm fraction of ore. Mineral compounds, such as sodium silicate and calcium sulfate, and non-ionic, cationic, and anionic polymer compounds, were used in the agglomeration process. The strength of interparticle bonding was evaluated by measuring the fine migration percentage (FMP) in the soak test. The results revealed that agglomerates produced using non-ionic compounds had the highest bonding strength, with an FMP of 3.89%, the lowest of all the compounds tested. This enhanced bonding strength was attributed to the combined influence of hydrogen bonding forces and van der Waals forces.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 176682
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrometallurgical treatment of hazardous copper Cottrell dusts to recover copper
    Autorzy:
    Alguacil, F. J.
    Regel-Rosocka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/110814.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Cu solid wastes
    leaching
    solvent extraction
    cementation
    Opis:
    Copper flue dusts, or copper Cottrell dusts, from three types of copper smelting furnaces were leached with different ammonia-based reagents (ammonium chloride, ammonium carbonate and aqueous ammonia solutions) to dissolve the oxidised copper species via the formation of copper-ammonia complexes, so that most of the copper-accompanying metals, especially iron, remained in the solid residue. Such copper-bearing dusts are not only valuable secondary source of copper but also are considered as hazardous materials and cannot be dumped as such. Therefore, two procedures for copper dust treatment are proposed, one of them includes ammonium-based leaching, liquid-liquid extraction with LIX 860 (aldoxime), LIX 84 (ketoxime) or LIX 54 (β-diketone) and electrowinning to grade A copper cathode. The other one covers also ammonium-based leaching followed by cementation with zinc to copper cement as a final product.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 771-780
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of iron selectivity behavior of copper smelter slag flotation tailing with hematitization baking and base metals leaching methods
    Autorzy:
    Kart, Elif Uzun
    Yazğan, Zeynep Hazal
    Gümüşsoy, Aleyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2146871.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    iron selectivity
    hematitization baking
    copper smelter slag flotation tailing
    base metal leaching
    Opis:
    In this study, iron selectivity behaviour of copper smelter slag (CSS) flotation tailings (38.08% Fe, 0.35% Cu, 4.48% Zn, 0.16% Co, 0.37% S) having fayalite and magnetite as major minerals was investigated with hematitization baking and base metals leaching methods using mineralogical and chemical analyses. For selectivity of iron, it was baked at temperatures of 650-690-700-710-730°C. The aim of the baking is to transform the almost all of the iron in the fayalite into the oxidized (non-soluble) form and the base metals into the sulphated (soluble) form. The temperature that had the lowest hematitization rate of iron was found to be 650°C, and the highest temperature was found to be 730°C. To examine the dissolution behaviour of baked CSS flotation tailing was leached at 50°C at a 1/10 (w/v) for 1 hour by using water. After baking at 690°C calcine and leaching residue, S values were determinated to be approximately 17% and 9%, respectively. Baking made at 700⁰C, amount of sulfate also decreased to 10% and S content was measured as 4% of its leaching residue. As a result of this study, 690⁰C/700⁰C was determined as optimum conditions of hematitization baking and base metals were extracted selectively when the iron was remained at leaching residue in Fe2O3 phase. It was determined that, hematitization is high and the sulphates of the base metals are preserved at 700⁰C temperature. The fayalite phase completely decomposed into Si-O/Fe-O/Zn-S-O/Co-S-O compounds at 700⁰C baking which was the highest iron selective and base metals dissolute temperature.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 5; 164--175
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of externally adding pyrite and electrical current on galvanic leaching of chalcopyrite concentrate
    Autorzy:
    Asgari, Kaveh
    Hassanzadeh, Ahmad
    Nazari, Sabereh
    Vakylabad, Ali Behrad
    Hosseinzadeh, Mostafa
    Powiązania:
    https://bibliotekanauki.pl/articles/1447957.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    copper concentrate
    galvanic leaching
    pyrite
    electrical current
    leaching kinetics
    Opis:
    Although the operating properties of GalvanoxTM leaching have been widely studied in the literature, several factors concerning chalcopyrite passivation during the process remain unknown so far. The present work hence aims at investigating the significant effect of externally added pyrite features with a particular focus on its particle size (d80 of 0.52, 20, 45 and 2000 µm) through a series of experiments performed in a 2-L stirred-tank electro-reactor. To this end, the role of pyrite: chalcopyrite ratio (0.49:1, 2:1 and 4:1) and presence of electrical current were examined while the rest of the parameters kept constant (80 °C temperature, 400–500 mV (Ag/AgCl) redox potential, pulp density of 10% (w/v), and stirring rate of 1200 rpm). Plus, kinetic models of the leaching tests were studied based on the diffusion and chemical controlling concepts. It was found that the coarser the pyrite particles, the more favorable the copper extraction from the concentrate due to acceleration of reactions in the cathodic electrode and high mass transfers. However, this was in contradiction with the existing reports in the literature. Moreover, galvanic interactions became intensive in the presence of pyrite meaning extensive chalcopyrite dissolution with significantly reduced passivation. Ultimate copper extraction values of 24.17±1.25%, 55.79±0.91% and 57.26±1.59% were resulted at Py:Cp ratios of 0.49:1 (natural), 2:1 and 4:1, respectively. The results showed that maximum copper recovery of 67.32±2.34% was obtained at an optimum condition of pyrite grain size=2000 µm, Py:Cp=4:1, current application=500 mA, 8 h and 80 °C. Finally, detailed kinetic modeling indicated that the chemical control mechanism was dominant in the early reaction stages (t<3.5 h) concerning the availability of fresh surface for chemical agents; however, the second half of the process (8.0 h>t>3.5 h) was controlled by the diffusion control.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 2; 105-119
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of sulphation baking and autogenous leaching behaviour of Turkish metallurgical slag flotation tailings
    Autorzy:
    Kart, Elif Uzun
    Powiązania:
    https://bibliotekanauki.pl/articles/1445847.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    copper smelter slag
    flotation tailings
    sulphation baking
    autogenous leaching
    base metals extraction
    Opis:
    Turkish metallurgical slag flotation tailing’s (MSFT) that has not been evaluated yet sulphation baking phase transformations and autogenous leaching behaviour were investigated. The MSFT in the study consists of the residual fayalite (FeO•SiO2) phase from the flotation, with a copper recovery of 87%, of the slag released during the smelting of the copper sulphide mine in northern Turkey, and the non-soluble glassy/amorphous structure containing the 0.34%Cu, 4.16%Zn and 0.15%Co base metals locked and doped to this phase. The effects of temperature (350 -650°C) and sulphuric acid dosages (4-10 ml) on sulphation baking were investigated by X-ray diffraction and sulphur analyses of the baked MSFT (B-MSFT) to produce soluble base metal sulphates. Since sulphated metals are a kind of metal salt, autogenous leaching was applied to the B-MSFTs only with purified water to dissolute copper, zinc and cobalt. X-ray diffraction patterns show the transformation of fayalite to oxide and sulphate phases due to sulphation baking. All dissolution values of Co and Zn obtained by autogenous leaching of B-MSFTs produced under all determined conditions are almost the same as one another. This indicates that Co and Zn are doped to fayalite together and that part of cobalt is doped to the zincite structure and liberated and sulphated together. This study showed that MSFTs decompose leading to liberation and sulphation of the doped base metals in its structure at a rate of ≥90%, and that they autogenously dissolve under atmospheric conditions leading to recovery in a simple and economic manner.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 4; 107-116
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxidative pressurized acid leaching of waste printed circuit boards
    Autorzy:
    Lundstrom, M.
    Seisko, S.
    Jascisak, J.
    Orac, D.
    Aromaa, J.
    Havlik, T.
    Forsen, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/109824.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    batch leaching
    sulfuric acid
    copper
    tin
    gas formation
    Opis:
    The amount of waste printed circuit board (WPCB) increases continuously. There is an economic and environmental need to recover valuable metals from WPCBs. In this study, the applicability of oxidative pressurized acid leaching of WPCBs rich in copper and tin was investigated. The effect of leaching parameters such as temperature, partial oxygen pressure and chloride concentration on metal dissolution from WPCBs was studied in sulfuric acid media. It was shown that non-metallic elements present in WPCBs initiated gas formation, namely CO2 and CO, during oxidized pressure acid leach. Decomposition of plastic components already started at 90 °C with 1.5 MPa oxygen overpressure in the presence of 1 g/dm3 chlorides. Gas formation was shown to have a negative impact on the process since copper extraction was reduced to 27% compared to 80-90% extraction achieved from anode slimes used as a reference material. It was suggested that gas formation related to plastic components could have a severe impact on metal yields. The highest dissolution of tin equal to 36% was achieved at room temperature. It was found that higher temperature promoted tin hydrolysis.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 781-792
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of silver, nickel and copper cyanides on gold adsorption on activated carbon in cyanide leach solutions
    Autorzy:
    Sayiner, B.
    Acarkan, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/109675.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    gold
    silver
    nickel
    copper
    cyanide leaching
    activated carbon adsorption
    Opis:
    The effect of Ag, Ni and Cu cyanides on gold adsorption on activated coconut carbon in cyanide leach solutions was investigated by synthetic cyanide leach solutions containing gold and other metal cyanides. According to the adsorption tests Ag remarkably reduces the gold adsorption on activated carbon by competing with gold to adsorption sites. When the Ag concentration in solution increases up to 200 ppm the carbon adsorption method for gold recovery becomes inapplicable. Ni has an effect on gold adsorption on activated carbon, however even at as high concentrations of Ni as 250 ppm residual Au in solution is still below 1 ppm. Cu addition up to 300 ppm does not affect the gold loading significantly. According to the adsorption test studies, it is concluded that the metal-cyanides diminish the gold adsorption on activated carbon by adsorbing themselves and competing with gold. When the metals are present in the leach solution all together with gold, they also prevent adsorption of themselves as well as gold. Thus, when Au, Ag, Ni and Cu are present in solution simultaneously, the adsorption of all these metals decreases. The adsorption results were modeled by Fleming k,n adsorption kinetic model.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 277-287
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a hydrometallurgical technology for production of metals from kghm Polska Miedz S.A. concentrates
    Autorzy:
    Chmielewski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/951844.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydrometallurgy
    copper concentrates
    leaching
    Opis:
    Rapidly declining quality of copper concentrates produced by Lubin Concentrator of KGHM Polska Miedz SA, having very low content of Cu, high content of Pb, As and organic carbon as well as significant contents of Ag, Co, Ni, Zn, Re, V and Mo, makes the concentrates difficult-to-process by flash smelting. Currently hydrometallurgy, using sulfuric acid in the presence of iron(III) and oxygen as a leaching medium for base metals and chloride leaching for silver and lead, seems to be an alternative for pyrometallurgy. The goal of the work is to discuss main aspects of the necessity of application a new hydrometallurgical technology, based on different unit operations, including non-oxidative atmospheric, chloride and pressure leaching, recovery of Pb and Ag, separation of Cu and accompanying metals from PLS and arsenic neutralization. The unique lithological, mineralogical and chemical properties of the process feed were discussed in details. The results of laboratory investigations performed at the Wroclaw University of Technology and assumptions of the process scale-up for acquisition of data for full scale technology were summarized. Planned investigations on the pilot plant scale will provide technical and economic data for a pre-feasibility study of the future hydrometallurgical plant.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 1; 335-350
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The release of leachable constituents from copper slag depending on conditions of the leaching process
    Uwalnianie wymywalnych składników z żużla pomiedziowego w zależności od warunków procesu wymywania
    Autorzy:
    Mizerna, K.
    Kuterasińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/953649.pdf
    Data publikacji:
    2016
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    cooper slag
    leaching
    heavy metals
    żużel pomiedziowy
    wymywalność
    metale ciężkie
    Opis:
    The research on leaching of waste components is one of the methods for assessing the level of their contamination by soluble forms of heavy metals. The process of leaching depends on several factors, which change can cause a release of contaminants at different levels. The study presents the results on leaching of Cl–, SO4 2–, Fe, Na, K and heavy metals (Pb, Cd, Ni, Zn, Cu, Cr) from copper slag, which depends on the pH level of the eluent being used in the research. The research on leaching of heavy metals was also performed at various ratio of liquid to solid (L/S = 10 and 100 dm3/kg) and with using a waste with different sizes of the fraction. There was also analysed the total content of heavy metals in the waste. The highest leaching of Cl–, Cr, Ni, Cu, Pb and Zn was observed with the eluent pH level of 13. Waste grain reduction to the size of < 0.125 mm has caused an increase in the release of copper and zinc into the aqueous phase.
    Badanie wymywalności składników odpadów jest jedną z metod oceny poziomu ich zanieczyszczenia rozpuszczalnymi formami metali ciężkich. Przebieg procesu wymywania uzależniony jest od kilku czynników, których zmiana może powodować uwalnianie zanieczyszczeń na różnych poziomach. W pracy przedstawiono wyniki wymywalności Cl–, SO4 2–, Fe, Na, K oraz metali ciężkich (Pb, Cd, Ni, Zn, Cu, Cr) z żużla pomiedziowego w zależności od pH cieczy wymywającej użytej w badaniu. Badanie wymywalności metali ciężkich przeprowadzono także przy różnym stosunku cieczy do ciała stałego (L/S = 10 i 100 dm3/kg) oraz z wykorzystaniem odpadu o różnej wielkości frakcji. Dokonano także analizy zawartości ogólnej metali ciężkich w odpadzie. Zaobserwowano najwyższą wymywalność Cl–, Cr, Ni, Cu, Pb i Zn przy pH cieczy wymywającej na poziomie 13. Redukcja ziaren odpadu do wartości < 0,125 mm spowodowała wzrost uwalniania miedzi i cynku do fazy wodnej.
    Źródło:
    Ecological Chemistry and Engineering. A; 2016, 23, 1; 101-110
    1898-6188
    2084-4530
    Pojawia się w:
    Ecological Chemistry and Engineering. A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the Harmfulness of the Slags from Copper Smelting Processes, in an Aspect of their Management
    Autorzy:
    Holtzer, M.
    Bydałek, A.
    Wołczyński, W.
    Kmita, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382572.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative technology
    slag copper
    leaching
    environmental protection
    technologia innowacyjna
    żużel
    ługowanie
    ochrona środowiska
    Opis:
    There are two methods to produce primary copper: hydrometallurgical and pyrometallurgical. Copper concentrates, from which copper matte is melted, constitute the charge at melting primary copper in the pyrometallurgical process. This process consists of a few stages, of which the basic ones are roasting and smelting. Smelting process may be bath and flash. Slag from copper production, on the end of process contain less 0,8%. It is treat as a waste or used other field, but only in a few friction. The slag amount for waste management or storage equaled 11 741 – 16 011 million tons in 2011. This is a serious ecological problem. The following slags were investigated: slag originated from the primary copper production process in the flash furnace of the Outtokumpuja Company in HM Głogów 2 (Sample S2): the same slag after the copper removal performed according the up to now technology (Sample S1): slag originated from the primary copper production process in the flash furnace of the Outtokumpuja Company in HM Głogów 2, after the copper removal performed according the new technology (Sample S3). In practice, all tested slags satisfy the allowance criteria of storing on the dumping grounds of wastes other than hazardous and neutral.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 3; 191-195
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the application of sewage sludge compost on the content and leaching of zinc and copper from soils under agricultural use
    Autorzy:
    Bowszys, T.
    Wierzbowska, J.
    Sternik, P.
    Busse, M. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/125278.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    sewage sludge
    composts
    zinc
    copper
    soil leachate
    Opis:
    Municipal sewage sludge can be used in agriculture provided that the permissible levels of heavy metals are not exceeded in either the sewage sludge or in the top layer of soil to be amended by this substance, and that its application does not deteriorate the soil quality. The purpose of this study was to determine the effects of different forms of sewage sludge on the content of Cu and Zn in soil and in soil leachate. The study comprised 2 rotations (potato, spring barley, winter oilseed rape, winter wheat). Each series was composed of the following treatments: NPK, FYM, municipal sewage sludge composted with straw, dried and granulated municipal sewage. FYM and composted sewage were applied once in the rotation (under potato) in a dose of 10 Mg d.m. ha-1 and twice (under potato and under winter oilseed rape) in a dose of 5 Mg d.m. ha-1. In the other years (under spring barley and winter wheat), soil received only mineral fertilization. In order to evaluate the effect of the composts on the leaching of Cu and Zn from soil, a lysimetric experiment was conducted under controlled conditions. Before the experiment, the soil content of Cu was low (1.47 mg kg-1) and Zn was medium (10.11 mg kg-1). The content of copper in the composts ranged from 4.5 to 340.1 mg kg-1 d.m. and that of zinc was from 109.5 to 1310.1 mg kg-1 d.m. The composted sewage sludge significantly raised the soil content of available forms of Cu and Zn, but did not change the soil nutrient abundance class. Fertilization modified the content of the microelements in the soil leachate.
    Źródło:
    Journal of Ecological Engineering; 2015, 16, 1; 1-7
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of pyritic tailings from a copper concentration plant for calcareous sodic soil reclamation
    Autorzy:
    Tozsin, G.
    Arol, A. I.
    Cayci, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/109593.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    waste pyrite
    gypsum
    pyrite oxidation
    column leaching test
    sodic soil
    reclamation
    Opis:
    This study was aimed to investigate the feasibility to use waste pyrite and sulphuric acid produced from waste pyrite for the reclamation of calcareous sodic soils. The final aim is to displace Na from an exchange complex and replace it with Ca, leading to a decrease in pH and exchangeable sodium percentage (ESP) and an improvement of soil structure. A fertility of the soil may also be enhanced by this technique since waste pyrite can be rich in several micronutrients. An additional advantage to this strategy is that waste pyrite is inexpensive and readily available in large quantities, by contrast to gypsum. In this study, column-leaching tests were carried out to evaluate a change in soil properties upon addition of gypsum and pyritic tailing amendments from a copper concentration plant. An availability of essential micronutrients for a plant growth (Fe, Cu, Zn and Mn) and hazardous potential of pyritic tailings in terms of heavy metal contamination were taken into account. Gypsum, powder waste pyrite and sulfuric acid produced from waste pyrite were applied to the soil with reference to the gypsum requirement (GR) of the soils. The results showed that application of waste pyrite with a dose of 44.74 megagrams per ha was superior to gypsum of 55.20 Mg/ha dose in terms of exchangeable sodium percentage (ESP) in 42 weeks. In addition, application of all the concentrations of sulfuric acid produced from waste pyrite also decreased the ESP values. The best values with sulfuric acid were obtained with a dose of 35.31 Mg/ha in 26 weeks. It was observed that the content of all micronutrients in the soil increased significantly (P<0.01) with waste pyrite and sulfuric acid applications. The levels of the micronutrients after treatments can be classified sufficient for the plant growth except for the iron level with the minimum dose of sulfuric acid application 17 Mg/ha. The heavy metal content in the soil after treatment with the pyritic tailings was found to be lower than the legal limit values. Thus, waste pyrite can be effectively used since rapid amelioration of calcareous sodic soils is possible with no deleterious heavy metal contamination.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 2; 693-704
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Interaction of Mine Drainage Waters with Impregnated Copper-Nickel Ores
    Badanie interakcji wód drenarskich z impregnowanymi rudami miedzi i niklu
    Autorzy:
    Svetlov, A.
    Makarov, D.
    Potapov, S.
    Nekipelov, D.
    Seleznev, S.
    Parshina, N.
    Masloboev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/319047.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    ruda miedziowo-niklowa
    woda kopalniana
    ługowanie
    copper-nickel ore
    mine water
    leaching
    Opis:
    The work deals with processes occurring on interaction of mine drainage waters with fine-grain dusty particles, and filtration of the water through sulphide rock mass. The studies have shown that the environmental hazard likely to be caused by the drainage waters of the Severny mining plant of the Kola MMC Ltd is lower than it might be expected owing to precipitating of the heavy metals by iron hydroxides and magnesium hydrosilicates. An assessment of the feasibility of hydrometallurgical processing of impregnated copper-nickel ores has been prepared.
    Praca dotyczy procesów zachodzących w interakcji wód drenażowych kopalnianych z pyłowymi cząstkami drobnoziarnistymi oraz filtracji wody poprzez masy skał siarczkowych. Badania wykazały, że zagrożenie dla środowiska spowodowane przez kwaśny drenaż wody kopalni Severny w Kola MMC Ltd jest niższa niż można się było spodziewać z powodu wytrącenia ciężkich metali za pomocą wodorotlenków żelaza i hydrokrzemianów magnezu. Dokonano oceny wykonalności przeróbki hydrometalurgicznej impregnowanych rud miedzi i niklu.
    Źródło:
    Inżynieria Mineralna; 2018, R. 19, nr 1, 1; 165-171
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physicochemical Properties of Copper Modified Zeolite
    Właściwości fizykochemiczne zeolitu modyfikowanego miedzią
    Autorzy:
    Świderska-Dąbrowska, Renata
    Schmidt, Rafał
    Dąbrowski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1812060.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    zeolite
    precipitation
    surface modification
    calcination
    zeta potential
    leaching
    zeolit
    strącanie
    powierzchniowa modyfikacja
    kalcynacja
    potencjał dzeta
    rozmywalność
    Opis:
    Zeolites have been used in environmental engineering mainly in catalytic processes and as ion exchangers in water and wastewater treatment. Selective modified zeolites allow significant improvement in the effectiveness of impurities’ removal without introducing additional reagents to the environment. The final effect of treatment of water solutions is determined by the catalyst used, its physicochemical properties and the process parameters. In this work effectiveness of zeolite modification methods as well as their physical and chemical stability, taking into account the changes that take place during the process of calcination within the temperature range of 250°C to 650°C is presented. A natural clinoptilolite used in the experiment was transformed into the hydrogenous form and subsequently modified with copper (II) ions by coprecipitation with NaOH and Na2CO3. The effect of the method of the zeolite modification on Cu content, the zeolite Leaching capacity and surface charge was evaluated. An analysis of experimental results has shown that calcination temperature does not significantly change the surface charge, but does affect copper speciation. Analysis of EDS spectra by a scanning microscope, which showed that new and regular forms of copper compounds had been formed along the zeolite lattice structure is also presented. The experimental results show that retention of Cu in zeolites was caused by electrostatic interactions between Cu(II) cations and the electronegative surface of the zeolite and coprecipitation of Cu(II) complexes. Physicochemical properties of examined zeolites were affected by processes of hydration, hydrolysis and complexing of Cu with the zeolite matrix as a function of the solution’s pH. Results show that the process of impurities’ removal from water and wastewater depends on the method of zeolite modification and on the solution’s pH.
    W inżynierii środowiska zeolity stosowane są przede wszystkim jako wymieniacze jonowe w oczyszczaniu wody i ścieków oraz w procesach katalitycznych. Selektywne modyfikowane zeolity pozwalają na znaczące zwiększenie skuteczności usuwania zanieczyszczeń, jednocześnie nie wprowadzając dodatkowych reagentów do środowiska. O końcowym efekcie decyduje rodzaj zastosowanego katalizatora, jego właściwości fizykochemiczne oraz parametry prowadzenia procesu. W pracy przedstawiono efektywność metod modyfikacji zeolitów oraz ich stabilność fizyczną i chemiczną, z uwzględnieniem zmian zachodzących podczas procesu kalcynacji w zakresie temperatur od 250°C do 650°C. W badaniach zastosowano zeolit naturalny klinoptylolit, który przeprowadzono w formę wodorową roztworem HCl, a następnie poddawano modyfikacji jonami miedzi (II) metodą współstrącania z użyciem NaOH i Na2CO3. Oceniono wpływ sposobu prowadzenia modyfikacji zeolitu na zawartość Cu, jego rozmywalność oraz ładunek powierzchniowy. Analiza wyników badań wykazała, że temperatura kalcynacji nie wpływa istotnie na zmianę ładunku powierzchniowego, ale na formę występowania związków miedzi. W pracy przedstawiono również analizę widm EDS wykonanych mikroskopem skaningowym, która pokazała, że wzdłuż struktury krystalicznej zeolitu zostały utworzone nowe i regularne formy związków miedzi. Wyniki badań wykazały, że zatrzymywanie Cu w zeolitach zachodziło na skutek oddziaływań elektrostatycznych między kationami Cu(II) i elektroujemną powierzchnią zeolitu oraz w wyniku strącania i współstrącania kompleksów Cu(II). Czynnikami wpływającymi na właściwości fizykochemiczne badanych zeolitów są procesy hydratacji, hydrolizy i kompleksowania Cu z matrycą zeolitu w funkcji pH roztworu. Przedstawiona w pracy analiza wyników badań wykazała, że proces usuwania zanieczyszczeń z wód i ścieków uzależniony jest od sposobu modyfikacji zeolitu oraz od pH roztworu.
    Źródło:
    Rocznik Ochrona Środowiska; 2019, Tom 21, cz. 2; 810-824
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method of utilization of the spent vanadium catalyst
    Autorzy:
    Mazurek, K.
    Grzesiak, P.
    Drużyński, S.
    Kiełkowska, U.
    Wróbel, A.
    Szalla, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778811.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    potassium hydroxide
    spent vanadium catalysts
    leaching
    recovery
    ion exchange
    vanadium
    copper
    zinc
    arsenic
    lead
    Amberlite® IRA958
    Dowex® 1X2
    Opis:
    A spent vanadium catalyst, from the plant of metallurgical type, was leached in a potassium hydroxide solution to recover vanadium. The effect of time, temperature, concentration of basic, catalyst particle size and phase ratio was studied. The results showed that for a 160–750 μm catalyst leached for 4 h at 313.15 K in the presence of 10% potassium hydroxide solution at a liquid: solid ratio of 20:1, the extent of leaching of V was about 87%. Additionally, separation of vanadium from such a solution was investigated by the ion exchange method. Two types of polymer strongly basic ion exchangers were used. The ion exchange tests indicate that vanadium were loaded from the post-leaching solution with high efficiency. On this basis a flowsheet for the proposed process of a complex utilization of the spent vanadium catalyst is presented.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 3; 1-7
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary studies on hydrometallurgical tin recovery from waste of tin stripping of copper wires
    Wstępne badania hydrometalurgicznego odzysku cyny z odpadów procesu odcynowania drutów miedzianych
    Autorzy:
    Rudnik, E.
    Wincek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/263862.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    electrolysis
    leaching
    tin
    tin(IV) oxide
    waste
    elektroliza
    ługowanie
    cyna
    cyna(IV)
    odpady
    Opis:
    This paper presents the results of tin leaching and electrowinning from SnO2 waste originating from the industrial process of tin stripping of copper wires. The sludge was leached by acids (sulfuric, hydrochloric, tartaric, oxalic) and sodium hydroxide at various temperatures (40–80°C). The highest efficiency of tin leaching (12–18%) was obtained in an oxalic solution, while the lowest effectiveness (0.2–0.5%) was found for sulfuric acid. Tin leaching was accompanied by a transfer of copper residues to the solution. The electrowinning stage was realized under potentiostatic and galvanostatic conditions using oxalate solutions. Cyclic voltammetry was applied to select the potentials for the selective deposition of metals.
    W artykule przedstawiono wyniki uzyskane w trakcie ługowania i elektrolitycznego odzysku cyny z odpadów SnO2 pochodzących z przemysłowego procesu usuwania cyny z drutów miedzianych. Szlam ługowano w roztworach kwasów (siarkowego, solnego, winowego, szczawiowego) i wodorotlenku sodu, w różnych temperaturach (40–80°C). Najwyższą skuteczność ługowania cyny (12–18%) otrzymano w roztworze szczawianowym, podczas gdy najniższą wydajność (0,2–0,5%) stwierdzono w przypadku kwasu siarkowego. Ługowaniu cyny towarzyszyło przejście pozostałości miedzi do roztworu. Elektrolityczny odzysk metali został zrealizowany w warunkach potencjostatycznych i galwanostatycznych z zastosowaniem roztworu szczawianowego. Warunki potencjałowe selektywnego osadzania metali wytypowano, opierając się na badaniach metodą woltamperometrii cyklicznej.
    Źródło:
    Metallurgy and Foundry Engineering; 2017, 43, 1; 7-20
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraction of vanadium and potassium compounds from the spent vanadium catalyst from the metallurgical plant
    Autorzy:
    Mazurek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/779744.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    kwas siarkowy
    tlenek siarki
    katalizatory wanadu
    ługowanie
    wanad
    potas
    miedź
    cynk
    arsen
    ołów
    XRF
    sulfuric acid
    sulfur oxide
    spend vanadium catalysts
    leaching
    recovery
    vanadium
    potassium
    copper
    zinc
    arsenic
    lead
    Opis:
    A spent vanadium catalyst, from the plant of metallurgical type, was leached in a sulfuric acid solution to recover vanadium and potassium compounds. The effect of time, temperature, concentration of acid, catalyst particle size and phase ratio was studied. Additionally the concentration of iron, copper, zinc, arsenic and lead compounds was determined. The flow sheet for the proposed process of spent vanadium catalyst leaching is presented.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 2; 49-53
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Release of heavy metals from waste into leachate in active solid waste landfill
    Autorzy:
    Talalaj, I. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/206952.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    copper
    cadmium
    carbonates
    heavy metals
    Pb concentration
    landfill
    leachate treatment
    leaching
    lead
    zinc
    solid waste landfill
    miedź
    kadm
    węglany
    metale ciężkie
    składowisko
    ługowanie
    ołów
    cynk
    stężenie ołowiu
    wysypisko odpadów stałych
    Opis:
    Mass balance of selected heavy metals (Cu, Cr, Pb, Hg, Zn, Cd) released from waste into leachate during 8 years of landfill exploitation has been calculated. The average release of all analyzed heavy metals did not exceed 1.7%. Heavy metals released in the largest quantities were Cr (0.025 –1.685%), Hg (0.033–1.540%) and Cd (0.082–0.701%). Release of Pb, Cu, Zn was 0.008–0.152%; 0.012–0.085% and 0.007–0.152%, respectively. Cr and Hg do not form an insoluble sulfide precipitate and that is why they are released in a larger amount. Cd and Pb concentrations are positively correlated with the amount of the atmospheric precipitation and the amount of leachates, which means that infiltrating rainfall can leach out these metals from waste. Favorable conditions for leaching of these metals are probably a result of their precipitation as carbonates. A strong correlation between Cu, Zn, and Cr indicates they do not precipitate as carbonates and further they can be subject to desorption processes. In the case of Cu, Zn, Cr and Hg, a positive correlation with the amount of deposited waste was also observed.
    Źródło:
    Environment Protection Engineering; 2015, 41, 1; 83-93
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enrichment fractions of trace metals in the five sludges collected from Pomerania
    Wzbogacanie frakcji metali śladowych w osadach filtracyjnych Pomorza
    Autorzy:
    Janukowicz, H.
    Wira, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/84901.pdf
    Data publikacji:
    1999
    Wydawca:
    Akademia Pomorska w Słupsku
    Tematy:
    trace metal
    sludge
    Pomeranian region
    filtration plant
    determination
    aluminium
    silver
    cadmium
    manganese
    zinc
    lead
    copper
    tin
    cobalt
    nickel
    iron
    distribution
    waste water sludge
    leaching technique
    Źródło:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 1999, 03
    1643-0115
    Pojawia się w:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining the optimum cut-off grades in sulfide copper deposits
    Określanie optymalnej wartości odcięcia zawartości procentowej pierwiastka użytecznego w złożach siarczku miedzi
    Autorzy:
    Rahimi, E.
    Oraee, K.
    Shafahi, Z. A.
    Ghasemzadeh, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/220153.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optimum cut-off grades
    heap leaching
    concentration
    sulfide deposits
    określanie optymalnego poziomu odcięcia dla zawartości pierwiastka użytecznego w rudzie
    ługowanie
    koncentracja
    złoża siarczku miedzi
    Opis:
    Optimum cut-off grades determination in mining life affects production planning and ultimate pit limit and it is also important from social, economical and environmental aspects. Calculation of optimum cut-off grades has been less considered for mines containing various mineral processing methods. In this paper, an optimization technique is applied to obtain optimum cut-off grades for both concentration and heap leaching processes. In this technique, production costs and different recoveries of heap leaching method directed into modeling different annual cash flows in copper mines. Considering the governing constraints, the Lagrange multiplier method is practiced to optimize the cut-off grades in which the objective function is supposed to maximize Net Present Value. The results indicate the effect of heap leaching process on the optimum cut-off grades of primary and secondary sulfide deposits.
    Określanie optymalnego poziomu odcięcia dla zawartości procentowej pierwiastka użytecznego ma poważny wpływ na planowanie produkcji, określanie ostatecznych limitów zasobów złoża; jest to także ważna kwestia z punktu widzenia kwestii społecznych, ekonomicznych i środowiskowych. Obliczanie optymalnego poziomu odcięcia dla zawartości procentowej pierwiastka użytecznego nie było zwykle szeroko rozważane w przypadku kopalni prowadzących ciągły system przeróbki. W pracy tej przedstawiono technikę optymalizacji określania poziomu zawartości procentowej pierwiastka użytecznego z uwzględnieniem zarówno procesów koncentracji jak i ługowania. W metodzie uwzględniono koszty produkcji i różne wskaźniki odzysku rudy, wielkości te wykorzystane zostały do modelowania rocznych przepływów gotówki w kopalniach miedzi. Uwzględniając narzucone ograniczenia, zastosowano metodę mnożników Lagrange’a w celu optymalizacji określania poziomu zawartości procentowej pierwiastka użytecznego, gdzie przyjętą funkcją celu jest maksymalizacja wartości bieżącej netto. Wyniki wskazują wpływ procesów ługowania na zawartość procentową pierwiastka użytecznego w rudzie pochodzącej z pierwotnych lub wtórnych złóż siarczku miedzi.
    Źródło:
    Archives of Mining Sciences; 2015, 60, 1; 313-328
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heap Leaching and Perspectives of Bioleaching Technology for the Processing of Low-Grade Copper-Nickel Sulfide Ores in Murmansk Region, Russia
    Ługowanie hałdy i perspektywy bioługowania dla przeróbki ubogich siarczkowych rud miedziowo-niklowych w rejonie Murmańska (Rosja)
    Autorzy:
    Svetlov, A.
    Seleznev, S.
    Makarov, D.
    Selivanova, E.
    Masloboev, V.
    Nesterov, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/318487.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    naturalne i antropogeniczne minerały siarczkowe
    metale nieżelazne
    ługowanie hałdy
    natural and anthropogenic sulphide-containing raw materials
    non-ferrous metals
    heap bioleaching
    Opis:
    Explored reserves are reducing. Сut-off grade sulfide ores from both abandoned and currently developed deposits, overburden rock while being a major source of non-ferrous metals, pose a serious environmental hazard if unprocessed. Reasonable utilization of rock waste dumps and low-grade ore is beneficial both from environmental and economical viewpoints. New techniques are designed to increase the selectivity and completeness of the disclosure of sulfide minerals, even in low-grade ores and mining waste. Among the variety of approaches is providing a bioleaching.
    Udokumentowane zasoby rudy są ograniczone. Rudy siarczkowe pozostałe w złożu po wydobyciu stwarzają poważne zagrożenie dla środowiska. Racjonalne wykorzystanie składowisk odpadów i rudy o niskiej zawartości metalu jest korzystne zarówno z punktu widzenia ochrony środowiska jak i ekonomiki. Nowe techniki mają na celu zwiększenie selektywności i kompletności wykorzystania minerałów siarczkowych, nawet z rud o niskiej zawartości i odpadów górniczych. Wśród różnych technologii rozpatrywane jest bioługowanie.
    Źródło:
    Inżynieria Mineralna; 2017, R. 18, nr 1, 1; 51-57
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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