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Tytuł:
Comparative study on removal of metallurgical silicon impurities by different acid leaching methods
Autorzy:
Gao, Zijie
Luo, Dawei
Powiązania:
https://bibliotekanauki.pl/articles/24085856.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
metallurgical-grade silicon
hydrometallurgy
acid leaching
impurity removal efficiency
Opis:
Hydrometallurgy is considered a promising method to produce solar-grade silicon (SOG-Si) from metallurgical-grade silicon (MG-Si) due to its advantages of low cost, simple operation, and easy control. In this paper, the effects of particle size of MG-Si, type of acid, leaching time, temperature, and liquid-to-solid ratio on the purification efficiency were investigated in an external field environment with the addition of ultrasound. The purification efficiencies of the two acid-leaching methods were compared. It was found that the simultaneous use of HCl + HNO3 was more effective than using only HCl for impurity removal in MG-Si: the extraction efficiencies of impurities Fe and Al were increased by 2.2% and 13.4%, respectively. The impurity contents in MG-Si before and after calcination pretreatment were also compared. This paper is expected to help researchers select the appropriate hydrometallurgical technique to reduce the impurity content in MG-Si.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 162331
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of acidic saliva on monomer leaching and surface roughness of 3D-printed and milled denture-base materials
Wymywanie monomerów wywołane przez kwaśną ślinę oraz chropowatość powierzchni drukowanych w 3D i frezowanych materiałów dentystycznych
Autorzy:
Al-Otaibi, Hanan
Basaqer, Rafal
Almania, Sarah
Alfouzan, Afnan
Al Taweel, Sara
Alshehri, Huda
Labban, Nawaf
Powiązania:
https://bibliotekanauki.pl/articles/24202785.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
polymethyl methacrylate
CAD/CAM milling
3D-printed
monomer leaching
surface roughness
salivary pH
polimetakrylan metylu
frezowanie CAD/CAM
druk 3D
wymywanie monomerów
chropowatość powierzchni
pH śliny
Opis:
The study evaluated the effect of different acidic salivary pH values on monomer leaching and surface roughness of conventional and CAD/CAM processed (milled and 3D-printed) denture base materials. High-performance liquid chromatography was used to determine the quantity of residual methyl methacrylate monomer leaching after 30 days of immersion in acidic saliva. The surface roughness (Ra) before and after incubation was recorded using a non-contact optical profilometer. The monomer leaching and the surface roughness of the tested materials depended on the pH value of the saliva. The conventional denture framework material exhibited the highest and lowest leaching rates at pH=4.5 and pH=3.5, respectively, regardless of the treatment method. Among the CAD/CAM processed materials, the 3D-printed material showed the highest and lowest leaching at pH=5.5 and pH=3.5, respectively. Regardless of the pH, roughness after incubation was the lowest for conventional materials, and the highest for 3D printing.
W pracy oceniono wpływ pH śliny na wymywanie monomerów i chropowatość powierzchni konwencjonalnych oraz wytworzonych metodą CAD/CAM (frezowanych i wydrukowanych w 3D) materiałów na podbudowy protez dentystycznych. Metodą wysokosprawnej chromatografii cieczowej oznaczono ilość wymytego monomeru (metakrylan metylu) po 30-dniowym zanurzaniu w kwaśnej ślinie. Chropowatość powierzchni (Ra) przed i po inkubacji rejestrowano za pomocą bezkontaktowego profilometru optycznego. Wymywanie monomerów oraz chropowatość powierzchni badanych materiałów zależały od wartości pH śliny. Konwencjonalny materiał na podbudowę protezy wykazywał największy i najmniejszy stopień wymywania odpowiednio przy pH=4,5 i pH=3,5, niezależnie od sposobu obróbki. Spośród materiałów poddanych obróbce CAD/CAM, materiał drukowany wykazał największe i najmniejsze wymywanie przy odpowiednio pH=5,5 i pH=3,5. Niezależnie od pH, chropowatość po inkubacji była najmniejsza w przypadku materiałów konwencjonalnych, a największa otrzymanych metodą druku 3D.
Źródło:
Polimery; 2023, 68, 3; 149--156
0032-2725
Pojawia się w:
Polimery
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:
Innovative Hydrometallurgy for Galvanic Sludge Sustainable Recovery
Autorzy:
Brožová, Silvie
Drápala, Jaromír
Brož, Jiří
Macháčková, Adéla
Powiązania:
https://bibliotekanauki.pl/articles/27323561.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
metals
galvanic sludge
leaching
zinc
iron
electrolysis
metale
osad galwaniczny
ługowanie
cynk
żelazo
elektroliza
Opis:
The manuscript explores the feasibility of recovering zinc and iron from waste galvanic sludge generated during galvanic plating processes. Galvanic sludge, characterized by elevated concentrations of heavy metals, represents a suitable candidate for hydrometallurgical recycling. The primary objective of the experimental and practical phases was to extract zinc and iron through the leaching of galvanic sludge. Leaching procedures were conducted using sulfuric acid at varying temperatures and time durations, augmented by the introduction of oxidizing agents such as hydrogen peroxide or ozone. Subsequent separation of the leach and filtrate was achieved through filtration. The leachate underwent additional processing involving the precipitation of iron and other metals, employing diverse agents. Following further filtration, electrolysis was employed to attain pure zinc on the cathode, utilizing an electrical voltage of approximately 3 V. Comprehensive chemical analyses were conducted on all intermediate products, including the leachate, leach liquor, filtrate, solid precipitate, and the separated metal on the cathode. The outcomes of these analyses are meticulously presented in tables and graphs.
Źródło:
System Safety : Human - Technical Facility - Environment; 2023, 5, 1; 46-56
2657-5450
Pojawia się w:
System Safety : Human - Technical Facility - Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing the removal of iron oxide from Egyptian feldspar ore
Autorzy:
Yassin, E. Khaled
Elbendari, A.M.
Hassan, El-Sayed R. E.
Powiązania:
https://bibliotekanauki.pl/articles/27323643.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
feldspar ore
iron oxide contamination
ball mill
Carpco magnetic separator
acid leaching
whiteness
Opis:
The demand for feldspar as a raw material for various industrial applications continuously increases. Feldspar is a primary raw material in manufacturing ceramics, glass, fillers, welding electrodes, and enamel. Feldspar is often associated with iron oxide, which decreases its economic value and hinders its industrial application. The present work aimed at reducing iron oxide content in Egyptian feldspar ore from the Wadi Zerabi locality. Ball milling was used for preparing feldspar feed of size -250+45μm. Carpco dry high-intensity magnetic separation followed by acid leaching processes were carried out in order to decrease the iron contamination and increase the feldspar content. A Box-Behnken statistical design was used to optimize the magnetic separation results. From a feldspar feed containing 1.40% Fe2O3, a non-magnetic concentrate of 0.25% Fe2O3 was obtained. The Fe2O3 removal reached up to 82% with a high yield as the % weight of non-magnetic feldspar reached up to 97.5%. The leaching process further reduced the iron oxide content down to 0.19 %. Also, the feldspar whiteness was improved from 65.17% in the original ore to 85.60% in the leached product.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 176420
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation study on clogging of suspended particles in in-situ leaching of uranium at different concentrations and flow velocity
Autorzy:
Zhou, Chunze
Wang, Hongqiang
Wu, Tongpan
Hu, Eming
Lei, Zhiwu
Wang, Qingliang
Powiązania:
https://bibliotekanauki.pl/articles/24085848.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
in-situ leaching of uraniom
physical clogging
suspended particles
porous medium
permeability coefficient
Opis:
Clogging problem has become one of the key problems restricting the mining efficiency of in-situ leaching of uranium, and the related research on the law and mechanism of physical clogging has not been reported. In order to identify and understand the complicated law and mechanism, experimental device is established to simulate the physical clogging caused by suspended particles in the uranium process, the physical clogging law and mechanism under different concentrations and velocity of flow are studied. The experimental results show that with the concentration of suspended particles increasing from 100, 200, 300 to 400 mg/L, the permeability of porous media gradually decreases, and the clogging phenomenon becomes more and more obvious. When the size of suspended particles is small and the velocity is 15 mL/min, the porous medium will not appear clogging, while the velocity is 25mL/min, the whole porous medium will slowly appear internal deposition clogging. When the size of suspended solids is larger and the flow rate is 9, 12, 15mL/min, the higher the velocity, the faster the clogging will be, and backwash can alleviate the surface clogging but cannot change the final clogging result. According to the experiment and actual situation, the physical clogging in in-situ leaching of uranium is mainly surface clogging and filter clogging.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 162150
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
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:
Wymywanie metali ciężkich z odpadów pobranych z hałdy wałbrzyskiej - badania wstępne
The leaching of heavy metals from waste collected from the Wałbrzych heap - preliminary research
Autorzy:
Zielińska, Amelia
Powiązania:
https://bibliotekanauki.pl/articles/31342928.pdf
Data publikacji:
2023
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
wymywanie
odpad górniczy
metale ciężkie
leaching
mining waste
heavy metals
Opis:
Celem pracy było określenie wartości wymywania wybranych metali ciężkich z odpadów pochodzących z hałd wałbrzyskich. Próbki pobranych materiałów rozdrobniono na frakcje poniżej 4 oraz poniżej 1, które następnie poddano wymywaniu, a w powstałym eluacie oznaczono zawartość Cd, Cr, Cu, Ni, Pb, Zn. Wartości stężeń metali są poniżej granic oznaczalności. Na tej podstawie stwierdzono, że migracja metali ciężkich z odpadów pogórniczych do środowiska wodnego jest nieznaczna i nie powinna stanowić istotnego problemu. Badania wymagają jednak kontynuacji dla zróżnicowanych warunków wymywania.
The aim of the work was to determine the leaching value of selected heavy metals from waste from Wałbrzych heaps. Samples of collected materials were crushed into fractions below 4 and below 1 mm, which were then subjected to leaching, and the content of Cd, Cr, Cu, Ni, Pb, Zn, was determined in the resulting eluates. Metal concentration values are below the limits of quantification. On this basis, it was found that the migration of heavy metals from post-mining waste to the aquatic environment is insignificant and should not be a relevant issue. However, research needs to be continued for different leaching conditions.
Źródło:
Górnictwo Odkrywkowe; 2023, 64, 3; 4-8
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chalcopyrite leaching by amino acid solutions in the presence of hydrogen peroxide
Autorzy:
Nurtazina, Nargiza
Uvarov, Nikolai
Azhigulova, Ryskul
Tyapkin, Pavel
Powiązania:
https://bibliotekanauki.pl/articles/2175441.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chalcopyrite
amino acid leaching
glycine
betaine
lysine
Opis:
It is demonstrated that amino acids such as glycine, betaine, and lysine may be applied as selective copper leaching agents in the process of hydrochemical oxidation of chalcopyrite at atmospheric pressure and in the temperature range 25÷65 °C. The advantage of the proposed method is its relative environmental friendliness. Solid samples of the initial mineral and leached chalcopyrite residues were analyzed by X-ray diffraction analysis, and Mössbauer and Raman spectroscopy. The results of the atomic absorption analysis showed that copper's extraction efficiency increased when the experiment's duration was raised and when the process temperature was higher. The leaching ability of amino acids was evaluated by the specific leaching rate of chalcopyrite in these reagents. Amino acid leaching was thought to be mainly due to the complexation of copper (II) glycinates, copper (II) betainates and copper (II) lysinates. This reaction can be enhanced by adding hydrogen peroxide to the system as an oxidant. It was determined that glycine was more effective as a leaching agent than betaine and lysine. Based on experimental data, it was assumed that the most possible mechanism is selective copper leaching due to the formation of chalcopyrite-based solid solution Cu1-XFeS2.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 157067
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization and treatment of clayey waste using a sulfuric acid roasting-water leaching process for the extraction of lithium
Autorzy:
Obut, Abdullah
Aktosun, Zeynep
Girgin, İsmail
Deveci, Hacı
Yörükoğlu, Abdulkerim
Powiązania:
https://bibliotekanauki.pl/articles/2146902.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Kırka boron plant
lithium
smectite
sulfuric acid roasting
water leaching
Opis:
In this study, a detailed characterization of the clayey waste of the Kırka boron plant was undertaken before the development of a sulfuric acid roasting-water leaching process for the extraction of lithium from this waste. The effects of roasting temperature (650-800°C) and sulfuric acid/waste ratio (90-260 kg H2SO4/1000 kg waste on a dry basis) on the extraction of lithium were investigated. By roasting the waste sample, which contained 0.37% Li2O with dolomite, smectite and borax as the main phases, at temperatures between 650°C and 800°C in the absence of sulfuric acid as the additive, CaMgSiO4 was found to form as the dominant phase after the decomposition of dolomite and smectite present in the sample. On the other hand, the X-ray diffraction analyses of the waste sample subjected to sulfuric acid treatment without roasting showed the in-situ formation of various hydrated calcium sulfate phases for all sulfuric acid/waste ratios tested. Besides, at the highest acid/waste ratio of 260, a hydrated magnesium sulfate phase was also identified in the sample. The application of the sulfuric acid roasting-water leaching process under the optimum roasting temperature of 750°C and the acid/waste ratio of 180 was found to lead to a lithium extraction of 85.7%. The applied sulfuric acid roasting-water leaching process appeared to be an attractive process with its attributes including low roasting temperature, high extraction percentage and no requirement for gypsum as the external sulfation agent.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 149635
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:
Direct conversion of alkaline earth metal hydroxides and sulfates to carbonates in ammonia solutions
Autorzy:
Ehsani, Ilhan
Ehsani, Arman
Ucyildiz, Ayse
Obut, Abdullah
Powiązania:
https://bibliotekanauki.pl/articles/2146856.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
alkaline earth metal
ammonia leaching
direct conversion
dissolved carbonate
smithsonite
Opis:
In this study, the direct conversion behaviors of different alkaline earth metal solids (the hydroxides and the sulfates of alkaline earth metals Ca, Sr, Ba and Mg) to their corresponding carbonates in dissolved carbonate-containing pregnant solutions obtained by direct leaching of a smithsonite (ZnCO3) ore sample in aqueous ammonia solutions having different concentrations (4 M, 8 M and 13.3 M NH3) were investigated by using X-ray diffraction analyses at alkaline earth metal to dissolved carbonate mole ratios of 1:1 and 1:2, for revealing the conversion possibilities of dissolved carbonate in the pregnant solutions to solid carbonate by-products. The results of direct conversion experiments showed that Ca(OH)2, CaSO4•2H2O, Sr(OH)2•8H2O and Ba(OH)2•8H2O converted to their corresponding carbonates, SrSO4 partially converted to SrCO3 as observed by the presence of unreacted SrSO4 peaks in X-ray diffraction patterns of the converted solids, and BaSO4 did not convert to BaCO3 because of its lower solubility with respect to BaCO3. On the other hand, it was observed that Mg(OH)2 did not convert to MgCO3, but MgSO4•7H2O converted dominantly to an uncommon phase, which was tentatively identified as Mg5Zn3(CO3)2(OH)12•H2O. In the study, a complete discussion on the conversion behaviors of alkaline earth metal solids to their corresponding carbonates was given considering the differences between their solubility product constants and the changes in the free energies of the theoretical conversion reactions. In addition, infrared spectra and scanning electron microscope images of some of the converted solids were also presented for characterization purposes.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 1; 169--180
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Study of the Negative Impact on the Environment During the Extraction of Uranium By In-Situ Leaching
Autorzy:
Kryakhtunov, Alexander V.
Powiązania:
https://bibliotekanauki.pl/articles/2086430.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
geoecological characteristics
deposit area
uranium
radionuclide content
underground leaching
Opis:
The purpose of this study was a detailed analysis of all aspects related to the impact of objects and structures of the planned economic activity on the environment on the territory of the Semizbay deposit in the Republic of Kazakhstan. In the course of the work, the geoecological characteristics of the Semizbay deposit were presented. The analysis of data on the state of the components of the natural environment, based on the materials of earlier studies at the facility, was carried out. On the basis of the actual material, a list of priority pollutants subject to monitoring was compiled. The methodology and organization of the projected works are given. The types, conditions, scope of work were indicated. During the study, the following were carried out: soil sampling was carried out in the vicinity of the deposit, radiochemical analysis, and X-ray diffraction analysis. As a result of the study, a program of geoecological research was developed on the territory of the deposit: the content of radionuclides and the mineralogical composition of the sample were determined, which can become an alternative for further research on the territory of the enterprise.
Źródło:
Journal of Ecological Engineering; 2022, 23, 5; 260--270
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetics study and reaction mechanism for titanium dissolution from rutile ores and concentrates using sulfuric acid solutions
Autorzy:
Ismael, Mohamed H.
Mohammed, Hesham S.
El Hussaini, Omneya M.
El-Shahat, Mohamed F.
Powiązania:
https://bibliotekanauki.pl/articles/2146851.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
leaching kinetics
leaching mechanism
titanium
rutile concentrate
leaching design
shrinking
core model
Opis:
Recent developments of acid leaching of titanium concentrates and ores have produced renewed industrial and commercial interest. However, the leaching kinetics and mechanism of these concentrates and ores had received little attention. This work, therefore, addresses the leaching kinetics and mechanism of Ti from a rutile concentrate in sulfuric acid solution. The leaching reaction was controlled by diverse parameters like temperature, particle size, acid concentration, liquid/solid (L/S) ratio, and stirring speed. The leaching kinetics was investigated using the Shrinking Core Model in order to determine the optimum criteria which control the reaction. The kinetics analysis showed that the rate of dissolution of Ti increased by increasing reaction temperature, L/S ratio, and stirring speed, while it decreased upon increasing particle size. The kinetics analysis revealed that the dissolution reaction is controlled by the chemical reaction at the rutile particle surface. Applying the Arrhenius relation, the apparent energy of activation Ea for the leaching reaction was calculated to be 23.4kJ/mol. A semi-empirical overall rate equation was introduced to describe the combined effects of the process variables upon the rate of the dissolution reaction: 〖1-(1-x)〗^(1/3)=k_0 〖 C〗_([H2SO4])^0.803 〖 (dp)〗^(-0.518) 〖(L/S)〗^0.793 〖(w)〗^0.668 e^((-23400/RT)) t
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 1; 138--148
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kolumny ciśnieniowe w procesie technologicznym wzbogacania uranu
Pressure columns in the uranium enrichment process
Autorzy:
Pasiowiec, Piotr
Brożyna, Józef
Bańczyk, Klaudia
Wajs, Jerzy
Tora, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/2142989.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
sita szczelinowe zgrzewane
wzbogacanie uranu
ługowanie w złożu
ISL
welded slotted sieves
uranium beneficiation
in situ leaching
Opis:
W procesie wzbogacania uranu w kolumnach ciśnieniowych typu SNK stosuje się sita szczelinowe zgrzewane. W rozdziale przedstawiono nowe rozwiązania konstrukcyjne filtrów pionowych wykonanych z sit szczelinowych zgrzewanych produkowanych przez polską firmę Progress Eco sp. z o.o. sp.j. Sita szczelinowe są konsekwentnie modernizowane w celu zapewnienia urządzeniom maksymalnej skuteczności technologicznej, prostej i łatwej obsługi, zmniejszenia awaryjności pracy oraz uzyskania lepszej efektywności ekonomicznej. Sito jest najważniejszym elementem roboczym w filtrach, na którym dokonuje się proces oczyszczania czynnika roboczego. Dlatego też, od właściwego doboru parametrów konstrukcyjnych sita i odpowiednim dobraniu do określonych warunków technologicznych, zależy w dużym stopniu skuteczność prowadzonego procesu filtracji. Sita szczelinowe są wykorzystywane w wydobyciu uranu metodą In Situ Leaching – ISL – polegającą na ługowaniu rudy ze złoża podziemnego roztworami zasad lub kwasów a następnie wypompowywaniu roztworu na powierzchnię celem dalszego wzbogacania.
Slotted welded screens are used in the uranium enrichment process in SNK-type pressure columns. The chapter presents new design solutions for vertical filters made of welded slotted screens, produced by the Polish company Progress Eco sp. z o.o. sp. j. Slotted screens are consistently modernized in order to provide the devices with maximum technological efficiency, simple and easy operation, reducing the failure rate and obtaining better economic efficiency. The sieve is the most important working element in filters, on which the process of cleaning the working medium is carried out. Therefore, the effectiveness of the filtration process depends to a large extent on the proper selection of the construction parameters of the sieve and the appropriate selection for specific technological conditions. Slotted sieves are used in uranium mining using the In Situ Leaching – ISL method, which consists in leaching ore from the underground deposit with alkali or acid solutions and then pumping the solution to the surface for further enrichment.
Źródło:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2022, 110; 143--153
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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