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Tytuł:
A comparison of uranium recovery from low-grade ore by bioleaching and acid leaching
Autorzy:
Szolucha, M. M.
Chmielewski, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/109808.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bioleaching
acid leaching
column leaching
low-grade ore
uranium
recovery
shrinking core model
Opis:
The objective of this work was to compare the bioleaching with the acid leaching of uranium under similar process conditions within 65 days. The low-grade uranium ore used in the experiments was collected from Radoniow’s ‘small’ dump, Poland. Bioleaching and acid leaching studies were carried out in identical columns. The isolated bacterial consortium from the Radoniow’s mine was used for the bioleaching process. A solution of sulphuric acid and H2O2 as oxidizing agent was used for the acid leaching. The extraction of uranium under acid leaching conditions reached maximum of 64±13 % w/w after 31 days. The bioleaching of uranium achieved a maximum extraction of 75±15 % w/w after 55 days. In this study an attempt was made to demonstrate the relationship between the shrinking-core model and the experimental data by plotting the fractional conversion of uranium against time.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 136-149
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A multi-method approach to groundwater risk assessment : a case study of a landfill in southern Poland
Autorzy:
Sołtysiak, M.
Dąbrowska, D
Jałowiecki, K.
Nourani, V.
Powiązania:
https://bibliotekanauki.pl/articles/2059762.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
vulnerability
leaching tests
contamination index
landfills
Opis:
Estimating groundwater vulnerability to pollution is based on the quantitative and qualitative assessment of the degree of exposure to the pollution. This article attempts to assess groundwater vulnerability to pollution in the area of a complex of landfill sites located in the supply area of one of the important groundwater reservoirs in southern Poland. Two dynamic leaching tests and two static tests were carried out on two different samples of slag from one of the metallurgical landfills during various periods of storage (15 year old waste and freshly deposited waste). Transport equations were based on the data from a column experiment. The advection-dispersion equation for column leaching was employed, which confirmed the simulation parameters through experimentation. The results of the leaching tests on chlorides showed that they are leached from the landfill over a period of ~60–90 years from the moment of depositing the waste. The seepage time for the Quaternary aquifer is 1–7 years and, for the Triassic aquifer, 5–40 years. The Backman’s contamination index (1998) values exceeded 25, while a high threat to groundwater is observed when the contamination index value equals 3. The use of all the aforementioned methods determined the most vulnerable area.
Źródło:
Geological Quarterly; 2018, 62, 2; 361--374
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel method to extract vanadium from high-grade vanadium slag: non-salt roasting and alkaline leaching
Autorzy:
Liu, B.
Meng, L.
Zheng, S.
Li, M.
Wang, S.
Powiązania:
https://bibliotekanauki.pl/articles/110480.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
high-grade vanadium slag
cleaner production
non-salt roasting
alkaline leaching
mechanisms
Opis:
A new method using non-salt roasting-alkaline leaching to treat vanadium slag was proposed in this study. The V(III) in vanadium slag is oxidized to V(V) by roasting and the latter can be effectively leached out as vanadate by alkaline leaching. This method possesses distinct advantage of being able to treat high-grade vanadium slag. For the South Africa high-grade vanadium slag, the maximum vanadium recovery of 98% was achieved when the reaction conditions were roasting temperature of 850 °C, roasting time of 2 h, alkali concentration of 30 wt.%, leaching temperature of 210 °C, and leaching time of 2 h. The roasting and leaching mechanisms have been well elucidated based on the XRD and SEM analysis results. The phases transitions of vanadium slag were clearly presented. This work has laid the foundation for the industrial application of non-salt roasting-alkaline leaching and provided new insights into effective extraction of high-grade vanadium slag.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 657-667
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel method to extract vanadium from vanadium-bearing steel slag using sodium carbonate solution
Autorzy:
Gao, M.
Xue, X.
Li, L.
Yang, H.
Bai, R.
Wang, H.
Powiązania:
https://bibliotekanauki.pl/articles/109859.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
leaching
kinetics
vanadium
vanadium-bearing steel slag
Opis:
A new method using sodium carbonate solution to treat a vanadium-bearing steel slag is proposed. The effects of the particle size, solid-to-liquid ratio, initial concentration of sodium carbonate solution, leaching temperature and stirring speed on the leaching rate of vanadium were investigated. The leaching kinetics of vanadium from the vanadium-bearing steel slag was studied, which indicated that the leaching rate was controlled by the step of diffusion through the solid layer around the unreacted core. The apparent activation energy for the process was 13.75 kJ/mol. By using this process, vanadium could be extracted effectively with the leaching rate of more than 80%.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 911-921
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A quasi-stationary model of salt leaching
Quasi-stacjonarny model ługowania soli
Autorzy:
Rybka, J.
Urbańczyk, K.
Powiązania:
https://bibliotekanauki.pl/articles/2192084.pdf
Data publikacji:
2017
Wydawca:
Polskie Stowarzyszenie Górnictwa Solnego
Tematy:
leaching process modelling
solution mining
rock salt
modelowanie procesu ługowania
eksploatacja otworowa
sól kamienna
Opis:
In classical models of the cavern leaching process, brine concentration is determined by calculating the increase (or decrease) of concentration in successive time-steps, based on the salt balance. In a quasi-stationary model it is assumed that changes in brine concentration are negligible in the balance. Consequently, a concentration needs to be found at which the leaching rate allows temporary concentration stability to be achieved. Here, both types of models are compared, using the simplest case possible, namely the beginning of initial cut leaching by the method of direct water and brine circulation with an isolated cavern roof. In the case of cylindrical shape of the cavern, both models are compatible. The quasi-stationary model does not take into account the leaching history, as it determines its variable asymptote rather than the brine concentration itself. In the case considered, the formula of the quasi-stationary model is so simple that calculations can be made using an MS Excel spreadsheet. However, in the general case, the algorithm of the quasi-stationary model is much more complicated than that of the classical model, especially if the cavern shape is complex and the method of reverse circulation is applied during the cavern leaching process.
W klasycznych modelach procesu ługowania kawern stężenie solanki wyznacza się przez obliczenie jego przyrostu (lub spadku) w kolejnych krokach czasowych na podstawie bilansu soli. W quasi-stacjonarnym modelu zakłada się, że przyrost stężenia jest pomijalny i wyznacza się takie stężenie, przy którym szybkość ługowania zapewnia chwilową stacjonarność stężenia. Oba modele są tu porównane na najprostszym przypadku – początku ługowania wrębu, w prawym obiegu wody i solanki oraz z izolacją stropu. Oba modele są zgodne, dopóki kształt kawerny jest walcem. Model quasi-stacjonarny nie bierze pod uwagę historii ługowania i nie tyle wyznacza stężenie, ile jego zmienną asymptotę. W rozpatrywanym przypadku formuła quasi-stacjonarnego modelu jest tak prosta, że obliczenia można wykonać w arkuszu MS Excela. W ogólnym przypadku algorytm modelu jest dużo bardziej skomplikowany niż w modelach klasycznych, zwłaszcza gdy kształt kawerny nie jest prosty i stosuje się obieg lewy.
Źródło:
Przegląd Solny; 2017, 13; 66--74
2300-9349
Pojawia się w:
Przegląd Solny
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:
A study on heavy metals mobility from zinc plant residues in Iran
Autorzy:
Moradkhani, D.
Eskandari, S.
Sedaghat, B.
Najafabadi, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/110826.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
heavy metals
zinc leaching plant
leaching filter cake
column leaching
Opis:
The transport of heavy metals from mining disposal site to groundwater and surface water is one of the most serious environmental problems in the world. The transport of heavy metals such as Zn, Cd and Mn from leaching filter cake in RECo, Zanjan, Iran was examined by using column leaching. Parameters studied included: flow rate, pH of input solution and leaching time. In this study, the maximum dissolution percents of Zn, Cd and Mn in input solution pH of 5 were 45.50 %, 53.97% and 19.94%, respectively. To statistically analysis the experimental results, SPSS14 software was employed. The results of SPSS 14 indicated that for the Zn, Cd and Mn dissolution, time and flow rate were found respectively, the effective parameters for the pollution in zinc leach residues.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 567-574
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the dissolution kinetics of iron oxide leaching from clays by oxalic acid
Autorzy:
Arslan, Volkan
Powiązania:
https://bibliotekanauki.pl/articles/1447278.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
clay
physico-chemical characterization
chemical leaching
oxalic acid
dissolution kinetics
activation energy
Opis:
Clay is widely used in a number of industries due to its special properties like fine particle size, brightness and whiteness, chemical inertness, platy structure, etc. In this study, the general characteristics of clays have been investigated by XRF, XRD, FT-IR, TG-DTA and SEM. The presence of iron as an impurity decreases its commercial value due to giving unwanted colors to clay mineral. Therefore, the dissolution capacity of clay ore was investigated by oxalic acid leaching. Under optimized leaching conditions (0.8 M oxalic acid concentration, 85°C reaction temperature, 1.75 ambient pH, 106+75 µm particle size, 15% w/v solids concentration and 150 min. leaching time) with 250 rpm stirring, 83.90% of $Fe_2O_3$ was removed. The amount of iron oxide, the main impurity in the clay, has been reduced from 2.70 to 0.40%. The iron dissolution kinetics was mainly controlled by internal diffusion control of shrinking core model and activation energy, $E_a$, of 26.29 kJ/mol was obtained for the process. The results also showed that the studied clays have adequate characteristics for ceramics industry, earthenware and porcelain production.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 3; 97-111
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acidic leaching of steam gasified, pyrolyzed and incinerated PCB waste from LCD screen
Autorzy:
Szczepaniak, Włodzimierz
Zabłocka-Malicka, Monika
Gurgul, Agnieszka
Ochromowicz, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1450359.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
electronic waste
recycling
metals
thermal treatment
acidic leaching
Opis:
In the recycling of WEEE, two approaches are common: a pyrometallurgical or hydrometallurgical treatment, preceded by a mechanical and/or physical separation. In this study, twostep processing of unmodified waste samples of LCD screen inverters was investigated: hightemperature processing followed by acidic leaching under fixed conditions (1M H2SO4, 90 ℃, 1 bar). The analysis carried out concerned a correlation between the type of HT treatment (pyrolysis, incineration, or gasification) and the dynamics of metals’ leaching from samples pretreated this way. It was found that HT method can act as “thermal disintegration”, since it affects, to a varying degree, the structure of the samples and cause elimination of organics and carbonaceous residue (incineration/gasification). The greatest mass loss (~18%) and the most loosened structure was observed for the gasified sample. Varying oxygen potential in HT-processes correlates well with the leachability of thermally treated inverters. The incineration was found to be the most favorable for copper extraction (>95%) by acidic leaching due to oxidized form of Cu, whereas Cu leaching from pyrolyzed and gasified samples needed oxygen and was controlled by the oxygen supply achieving only 36/43% after 6 h. The course of Pd leaching was similar to copper, although with lower efficiencies; 47% of palladium was extracted from the incinerated sample, and only 4 or 7% from gasified and pyrolyzed samples, respectively. Au was leached immediately but only to a slight extent. Contrary to Pb, leaching of Zn, Sn, Sb, and Ni was gradual, probably due to the formation of alloys with copper.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 6; 257-268
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alkaline Leaching of Low Zinc Content Iron-Bearing Sludges
Autorzy:
Gargul, K.
Jarosz, P.
Małecki, S.
Powiązania:
https://bibliotekanauki.pl/articles/355782.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sludge
dust
alkaline leaching
Zn recovery
recycling
Opis:
Various types of waste materials containing zinc (e.g. dusts and sludges from gas dedusting process) are obtained in steel industry. The contents of Zn in these materials may vary considerably. Even a low concentration of zinc in recirculated products precludes their recycling in ferrous metallurgy aggregates. Long storage of this type of material can lead to contamination of soil and water by zinc compounds which can be leached out by acid rain, for example. This paper focuses on research involving alkaline leaching tests of low zinc content iron-bearing materials. These tests were preceded by the analysis of the elemental, phase and grain size composition, and analysis of the thermodynamic conditions of the leaching process. The main aim of research was to decrease the content of the zinc in the sludge to the level where it is suitable as an iron-bearing material for iron production (~1% Zn). Leaching at elevated temperatures (368 K, 60 min) has led to a decrease in the zinc content in the sludge of about 66%. The research revealed that long hour leaching (298 K, 100 hours) carried out at ambient temperatures caused a reduction in zinc content by 60% to the value of 1.15-1.2% Zn.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 43-50
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alkaline leaching of zinc from argon oxygen decarbonization dust from stainless steel production
Autorzy:
Stefanova, A.
Aromaa, J.
Forsen, O.
Powiązania:
https://bibliotekanauki.pl/articles/110385.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
AOD dust
stainless steel
zinc
leaching
sodium hydroxide
Opis:
Stainless steel production generates solid wastes such as dust and sludge that are considered as harmful in most industrial countries. Today dusts are recycled in separate treatment plants as these dusts contain valuable metals such as alloying elements. A direct recycling of dust back to steel production is hindered due to the presence of elements, especially zinc, that cause operational difficulties in the stain-less steel making process. In this paper two different stainless steel converter argon oxygen decarboniza-tion dusts (AOD1 and AOD2), from Outokumpu Stainless (Tornio, Finland), were leached using NaOH solutions. The purpose was to selectively leach zinc out from the dusts and to find factors that affected most dissolution of zinc. The dust samples were leached under atmospheric pressure and the factors tested were temperature, sodium hydroxide concentration, liquid to solid ratio (L/S), stirring rate and oxygen or nitrogen gas bubbling. All the studied factors had statistically significant effect on the dissolution of zinc. The maximum zinc extraction was achieved at 95°C, with 8M NaOH solution, stirring rate of 400 rpm and L/S ratio of 30 and was around 80% for AOD1 dust and around 50% for AOD2 dust. Difference in maximum zinc extraction arose from the mineralogical differences of the dusts. Zinc was leached selec-tively. Among alloying elements only molybdenum was leached and practically no iron, chromium and nickel were dissolved.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 1; 27-46
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alkaline leaching of zinc from stainless steel electric arc furnace dusts
Autorzy:
Stefanova, A.
Aromaa, J.
Forsen, O.
Powiązania:
https://bibliotekanauki.pl/articles/110674.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
electric arc furnace dust
EAF
stainless steel
zinc
leaching
sodium hydroxide
Opis:
Stainless steel production generates dust and sludge that are considered as a harmful waste. These dusts contain also valuable metals but extraction and recovery of valuables is difficult due their complex composition. Zinc is the most troublesome element in the dust and it hinders direct recycling of dust back into furnaces. In this paper two different stainless steel electric arc furnace dusts (EAF1 and EAF2) from Outokumpu Stainless (Tornio, Finland), were leached using NaOH solutions. The purpose was to selectively leach out zinc from the dusts and to find factors that affected most dissolution of zinc. From all leaching factors temperature, agitation speed and NaOH concentration were found to be statistically strongly significant, whereas a liquid-to-solid ratio and bubbling gas were only somehow significant. Two experiments from the test series gave clearly higher zinc extraction, that is around 60% for EAF1 and 30% for EAF2. For those experiments, a strong 8 M NaOH solution with the high temperature and agitation speed was used but bubbling gas and liquid-to-solid ratio changed. Zinc was leached selectively and practically no iron, chromium and nickel dissolved.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 1; 293-302
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An experimental study of removing impurity from a quartz ore by microbial flotation-acid leaching
Autorzy:
Zhu, Jujian
Dai, Shujuan
Li, Pengcheng
Yang, Shuyong
Powiązania:
https://bibliotekanauki.pl/articles/1448443.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
quartz purification
flotation
acid leaching
waste bacteria
Opis:
The purity of a quartz ore is relatively low at a $SiO_2$ content of 97.18%, and the main impurity in the ore is $Fe$, $Al$, and $Ca$ bearing minerals. The main component in an industrial waste bacteria (WJ) is polysaccharides, which may be used as depressors for inhibiting iron minerals in quartz flotation. Moreover, WJ belongs to microbial inhibitors because it is mainly composed of bacteria. As a result of this study, a concentrate grade of 99.88% at recovery over 80% was obtained under the condition of 2000 g/Mg WJ dosage, a grinding fineness of 70% -0.074 mm, pH 11.7, 400 g/Mg $CaCl_2$, and 800 g/Mg $NaOL$ in the flotation experiments for the quartz ore. Moreover, a $SiO_2$ grade of 99.97% at a recovery of 68.85% was obtained at an acid dosage of 40 kg/Mg by using mixed acid of $H_2SO_4$, $HCl$, $HNO_3$, and $HF$ in mass ratios of 20%, 30%, 20%, and 30%, respectively, in subsequent acid leaching of the quartz flotation concentrate. Zeta potential analysis before and after the interaction of quartz and hematite with WJ showed that WJ increased the zeta potential of hematite significantly but had little impact on the zeta potential of quartz, indicating stronger adsorption of WJ on hematite than on quartz. FTIR analysis showed that there exist not only –$COOH$, –$CH_2$–, and –$CH_3$, which are the functional groups of starch but also $NH_2$ and –$C=O-NH$– in WJ. The $NH_2$ and –$C=O-NH$– in WJ are the important groups for adsorption, so the depressing effect on hematite was better for WJ than starch.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 1; 18-28
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An innovative technology for recovery of zinc, lead and silver from zinc leaching residue
Autorzy:
Zheng, Y.-X.
Lv, J.-F.
Liu, W.
Qin, W.-Q.
Wen, S.-M.
Powiązania:
https://bibliotekanauki.pl/articles/110688.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
zinc leaching residue
lead sulfate
zinc sulfate
reduction roasting
flotation
Opis:
Zinc leaching residue is a good source of zinc and has a great potential to be utilized. However, it is very difficult to recover lead, zinc and silver from the residue by traditional technologies. In this study, a new technology based on conversions of PbSO4 and ZnSO4 in the residue to their respective sulfides by reduction roasting with coal powder followed by a flotation treatment was developed. The effects of roasting temperature, coal dosage, reaction time and pyrite dosage were investigated at a laboratory scale. The results showed that the conversion extent of PbSO4 and ZnSO4 under the optimal experimental conditions was 71.89 and 69.76%, respectively. A flotation concentrate containing 39.13% Zn, 6.93% Pb and 973.54 g/Mg Ag was obtained from the treated material, and the recovery of Zn, Pb and Ag was 48.38, 68.23 and 77.41%, respectively. The tailing containing ZnFe2O4 or Fe3O4 could be either stockpiled or further disposed.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 943-954
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza jakości odpadów z nieczynnej hałdy górnictwa węgla kamiennego w odniesieniu do wymagań stawianych odpadom wydobywczym obojętnym
Analysis of the quality of waste from coal mining in relation to the requirements for inert mining waste
Autorzy:
Klojzy-Karczmarczyk, B.
Mazurek, J.
Staszczak, J.
Powiązania:
https://bibliotekanauki.pl/articles/394657.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
górnictwo węgla kamiennego
odpady wydobywcze
hałda górnicza kopalni Siersza
metale
zawartość całkowita
wymywalność
hard coal mining
mining waste
Siersza mining dump
metals
total content
leaching
Opis:
Wytwarzanie odpadów wydobywczych jest nieodłącznym elementem wydobycia i wzbogacania surowców, w tym węgla kamiennego. Wydobycie węgla kamiennego przez lata pozostawiło wiele obiektów, w postaci różnych pod względem strukturalnym i wiekowym, do składowania odpadów pogórniczych (hałd, zwałowisk). Obiekty te charakteryzują się zmiennym składem i uziarnieniem materiału, a warunki panujące w bryle zmieniają się w czasie, w wyniku procesów wietrzenia fizycznego i chemicznego. W ostatnich latach znaczenie gospodarcze skał płonnych towarzyszących wydobyciu węgla uległo zmianie i obecnie coraz częściej traktowane są one nie jako odpady, ale jako źródło surowców mineralnych do wykorzystania gospodarczego. W pracy przedstawiono analizę dostępnych danych literaturowych w zakresie jakości odpadów wydobywczych, zarówno tych przeznaczonych do gospodarczego wykorzystania, jak też zgromadzonych na hałdach. Przeprowadzono rozpoznanie jakości odpadów górniczych w profilu hałdy górniczej, jaka pozostała po zamkniętej kopalni węgla kamiennego Siersza w Trzebini. Wiek składowanych odpadów przekracza w tym miejscu 15 lat. Powierzchnia hałdy w większości jest już zrekultywowana, a ponadto obszar ten częściowo zdążył się już wkomponować w krajobraz na drodze naturalnej sukcesji. Materiał przeznaczony do analiz pobierano w przypowierzchniowym odcinku profilu hałdy, z dwóch przedziałów głębokości: od 0,2 do 0,3 m p.p.t. oraz od 0,4 do 0,7 m p.p.t. Analizie poddano materiał w odniesieniu do parametrów i ich wartości granicznych stawianych dla odpadów wydobywczych zaliczanych do odpadów obojętnych. Próbki przebadano zatem na obecność siarki oraz arsenu, kadmu, kobaltu, chromu, miedzi, rtęci, molibdenu, niklu, ołowiu, wanadu oraz cynku. Analizie poddano zawartość składników w formie całkowitej oraz wymywalnej. Badania wielkości wymywania składników z poszczególnych próbek określono metodą statyczną z zastosowaniem testu podstawowego 1:10. Na podstawie przeprowadzonych analiz stwierdza się, że w badanych odpadach z warstwy przypowierzchniowej hałdy górniczej całkowita zawartość poszczególnych pierwiastków jest zdecydowanie zróżnicowana w punktach poboru. Całkowita zawartość siarki w odpadach zdeponowanych na hałdzie przed kilkunastoma laty kształtuje się w szerokich granicach, osiągając uśrednioną wartość na poziomie 1,67 oraz 4,35% w zależności od głębokości poboru. zasadniczo obserwuje się niższe zawartości siarki w próbkach pobranych bliżej powierzchni niż w próbkach pobranych głębiej w profilu hałdy. Całkowita zawartość arsenu w odpadach deponowanych na hałdzie kształtuje się na uśrednionym poziomie 6,39 mg/kg, kadmu 1,90 mg/kg, kobaltu 7,18 mg/kg, chromu 116,19 mg/kg, miedzi 41,6 mg/kg rtęci 0,15 mg/kg, molibdenu 1,02 mg/kg, niklu 30,9 mg/kg, ołowiu 138,9 mg/kg, wanadu 86,9 mg/kg oraz cynku 477,4 mg/kg. Na podstawie przeprowadzonych badań nie można jednak sformułować wniosków o prawidłowości współwystępowania siarki i pozostałych pierwiastków w materiale badawczym. Otrzymane wyniki nie pozwalają na zaliczenie badanych odpadów do odpadów wydobywczych obojętnych, przede wszystkim ze względu na częste przekroczenia siarki oraz ołowiu i cynku w materiale oraz (w odniesieniu do wielkości wymywania) dodatkowo kadmu, chromu, miedzi, rtęci i niklu.
Production of mining waste is inherent to the mining and enrichment of raw materials, including hard coal. Hard coal production over the years has left a number of objects in the form of variable, in terms of structure and age, mining waste storage facilities (heaps, dumps). These objects are characterized by varying composition and particle size distribution of the material and the conditions prevailing in the solid change over time as a result of physical and chemical weathering processes. In recent years, the economic importance of gangue accompanying coal production has changed and now more and more often it is treated not as waste but as a source of mineral resources for economic use. The paper presents an analysis of the available literature data on the quality of mining waste, both those intended for economic use and accumulated in dumps and heaps. Identification of the quality of mining waste was conducted in the profile of the dump, which remained after the closed Siersza hard coal mine in Trzebinia. the age of stored waste in this location is over 15 years. A majority of the dump’s surface is already reclaimed, and in addition the area has partly already managed to integrate into the landscape through natural reclamation. The material intended for the analyses was collected at the near-surface section of the heap’s profile, from two depth intervals: from 0.2 to 0.3 m below ground level and from 0.4 to 0.7 m below ground level. The material was analyzed in relation to the parameters and limits set for mining waste classified as inert waste. therefore, the samples were examined for the presence of sulfur and arsenic, cadmium, cobalt, chromium, copper, mercury, molybdenum, nickel, lead, vanadium, and zinc. The contents of the components in the total and leachable form was analyzed. The testing of elements leaching from each sample was determined using the static method with the basic 1:10 test. Based on the conducted analyses, it is concluded that the tested waste from the near-surface layer of the mining dump has a strongly variable total content of individual elements, depending on the sampling sites location. The total sulfur content in the waste deposited in the dump more than a dozen years ago reaches a wide range of values, with an average at 1.67% and 4.35%, depending on the depth of the collection. In general, a lower sulfur content is observed in the samples closer to the surface than in the samples collected somewhat deeper in dump. The total arsenic content in the waste deposited in the heap is at an average level of 6.39 mg/kg, cadmium 1.90 mg/kg, cobalt 7.18 mg/kg, chromium 116.19 mg/kg, copper 41.6 mg/kg, mercury 0.15 mg/kg, molybdenum 1.02 mg/kg, nickel 30.9 mg/kg, lead 138.9 mg/kg, vanadium 86.9 mg/kg and zinc 477.4 mg/kg. Based on the conducted studies, one cannot make conclusions about the accuracy of the coexistence of sulfur and other elements in the tested material. The obtained results do not allow for the inclusion of the tested waste into the category of inert mining waste, mainly due to the exceedance of sulfur, lead and zinc content in the material and (in relation to the leaching) also cadmium, chromium, copper, mercury and nickel.
Źródło:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2016, 95; 227-241
2080-0819
Pojawia się w:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 307

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