Optimization of bioleaching and oxidation of gold-bearing pyrite-arsnopyrite ore concentrate in batch mode
| Autor: | A. E. Panyushkina, N. V. Grigor’eva, Iraida A. Tsaplina, Tamara F. Kondrat'eva |
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| Rok vydání: | 2014 |
| Předmět: |
inorganic chemicals
biology Thermophile Metallurgy Ore concentrate chemistry.chemical_element engineering.material Ferroplasma biology.organism_classification Applied Microbiology and Biotechnology Microbiology chemistry Bioleaching engineering Yeast extract Leaching (metallurgy) Pyrite Arsenic Nuclear chemistry |
| Zdroj: | Microbiology. 83:550-557 |
| ISSN: | 1608-3237 0026-2617 |
| Popis: | Biooxidation of refractory gold-bearing pyrite-arsenopyrite flotation concentrate was optimized and the abundance of predominant groups in the community of thermophilic acidophilic chemolithotrophic microorganisms at various stages of bioleaching was determined. The optimal parameters for growth and leaching/oxidation of the mineral components of the concentrate were pH 1.4–1.8; 47.5°C; and the following salt concentrations in the liquid phase (g/L): K2HPO4 · 3H2O − 0.53, (NH4)2SO4, 1.6 and MgSO4 · 7H2O, 2.5 (or (NH4)2SO4, 1.23; ammophos, 0.41; KOH, 0.1) with 0.03% yeast extract. The optimal conditions resulted in high growth rate, high levels of iron and arsenic leaching, of Fe2+ and S2−/S0 oxidation, and predominance of Acidithiobacillus caldus, Sulfobacillus spp., and Ferroplasma spp. in the community. |
| Databáze: | OpenAIRE |
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