title: [A two-stage technology for bacterial and chemical leaching of copper-zinc raw materials by Fe3+ ions with their subsequent regeneration by chemolithotrophic bacteria].
abstract: A two-stage technology for bacterial and chemical leaching of nonferrous metals in a specifically designed laboratory unit has been proposed. At the first stage of leaching, ferric iron formed during the second stage of oxidation of Fe2+ ions by mesophilic chemolithotrophic microorganisms was used. The optimal parameters of the first stage of the process (flow rate, temperature, and the process duration) were 2 l/h, 75 degrees C, and 2 h, respectively. The results of testing of the two-stage technology for leaching copper-zinc raw materials indicated that the depth of zinc and copper leaching can be increased from 70 to 93% and from 40 to 58.8%, respectively, and the process duration can be reduced from 120 to 24 h as compared to the commonly used one-stage technology.
authors.forename: N V
authors.initials: NV
authors.lastname: Fomchenko
authors.forename: V V
authors.initials: VV
authors.lastname: Biriukov
mesh_terms: D042763:Acidithiobacillus / Q000378:metabolism*; D019149:Bioreactors; D002412:Cations; D003300:Copper / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008903:Minerals; D010084:Oxidation-Reduction; D013440:Sulfides / Q000737:chemistry; D013696:Temperature; D015032:Zinc / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry
chemical_list: D002412:Cations; D008903:Minerals; D013440:Sulfides; D017967:Zinc Compounds; D003300:Copper; D007501:Iron; D015032:Zinc; C031238:zinc sulfide