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ArticleName Kinetic regularities of bio-leaching of persistent gold-bearing concentrate with usage of association of microorganisms
ArticleAuthor Zaulochniy P. A., Sedelnikova G. V., Savari E. E., Kim D. Kh.
ArticleAuthorData P. A. Zaulochnyy, Candidate, e-mail: zaulochny@rambler.ru; G. V. Sedel'nikova, Deputy Director; E. E. Savari, Head of Biotechnological Laboratory; D. Kh. Kim, Head of Geotechnological Laboratory, Central Geological Research Institute for Nonferrous and Precious Metals.
Abstract
The objective of this work was to compare the accelerate refractory sulphide concentrate biooxidation abilities of the pure and mixed mesophilic and moderately termophilic acidophiles cultures. Results of sulphide concentrate bioleaching were analyzed using the enzyme catalysis theory. Different effective kinetics parameters were calculated for Michaelis—Menten equation. Using microorganism association, including moderately termophilic, allow to intensity biohydrometallurgical refractory gold sulfide concentrate treatment. Bacterial leaching duration decreased, sulphide minerals oxidation increased. During next hydrometallurgical bioresidue treatment gold recovery by sorption cyanidation increased and cyanide consumption decreased.
keywords Bacterial leaching, gold-bearing concentrate, pyrite, apsenopyrite, microorganisms, oxidation, cyanidation.
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