title: [Optimization of bioleaching and oxidation of gold-bearing pyrite-arsnopyrite ore concentrate in batch mode].
abstract: Biooxidation of refractory gold-bearing pyrite-arsenopyrite flotation concentrate was optimized and aburidance of predominant groups in the community ofthermophilic acidophilic chemolithotrophic microorganisms at various stages ofbioleaching was determined. The optimal parameters for growth and leaching/oxidation of the mineral components of the concentrate were pSH 1.4, 1.6-1.8; 47.5 degrees 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 andarsenic leaching, of Fe2+ and S(2-)/S0 oxidation, and predominance of Acidithiobacillus caldus, Sulfobacillus spp., and Ferroplasma spp. in the community.
authors.forename: N V
authors.initials: NV
authors.lastname: Grigor'eva
authors.forename: I A
authors.initials: IA
authors.lastname: Tsaplina
authors.forename: A E
authors.initials: AE
authors.lastname: Paniushkina
authors.forename: T F
authors.initials: TF
authors.lastname: Kondrat'eva
mesh_terms: D001105:Archaea / Q000378:metabolism*; D001152:Arsenicals / Q000378:metabolism*; D052837:Chemoautotrophic Growth / Q000502:physiology*; D006094:Gram-Positive Bacteria / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000378:metabolism*; D058085:Iron Compounds / Q000378:metabolism*; D008903:Minerals / Q000378:metabolism*; D008954:Models, Biological; D010084:Oxidation-Reduction; D013440:Sulfides / Q000378:metabolism*
chemical_list: D001152:Arsenicals; D058085:Iron Compounds; D008903:Minerals; D013440:Sulfides; C064510:arsenopyrite; C011342:pyrite; D007501:Iron