Study of biohydrometallurgical technology used to recover gold from ore at a gold-recovery plant

A.K. Koizhanova; G.V. Sedelnikova; M.B. Erdenova; A.N. Berkinbaeva; E.M. Kamalov

doi:10.31643/2021/6445.03

Authors

A.K. Koizhanova Satbayev University, Institute of Metallurgy and Beneficiation
G.V. Sedelnikova JSC Rosgeologia
M.B. Erdenova Satbayev University, Institute of Metallurgy and Beneficiation
A.N. Berkinbaeva Satbayev University, Institute of Metallurgy and Beneficiation
E.M. Kamalov Satbayev University, Institute of Metallurgy and Beneficiation

DOI:

https://doi.org/10.31643/2021/6445.03

Keywords:

ore, gold, biochemical leaching, At. ferrooxidans, sodium hypochlorite, cyanidation.

Abstract

The article contains the results of the studies performed for the biochemical eхtraction modes for mineral raw materials using thionic bacteria Acidithiobacillusferrooxidans of a certain strain capable to oxidize sulfide minerals. A representative sample of mineral raw materials was taken, and its physical and chemical studies were performed. The optimal conditions to leach mineral raw materials with biochemical solvents based on various factors (temperature, S:W) were established. Modern physical and chemical methods of analysis were used during the study: X-ray fluorescence, X-ray phase, mineralogical, electron probe, chemical analyzes, IR methods to study the phase composition of ores and changes in the structure of minerals. The chemical composition of the ore sample quartered and crushed up to a size of -0.074 mm is as follows, wt. %: SiO₂ - 60.11; Al₂O₃ 6.2; Zn 0.016; Cu 0.10; Fe - 2.5; S 0.50; Au - 3.67 g/t and Ag - 3.2 g/t. This paper discusses various options for agitational leaching with acid pre-wash, bacterial dissection and oxidative decomposition of minerals using sodium hypochlorite. The results obtained showed that the most effective method to increase the gold recovery is to perform bacterial oxidation of ore using acidophilic bacteria At. Ferrooxidans preliminarily adapted to the material composition of the test sample, followed by treatment with sodium hypochlorite solution and cyanidation. Biohydrometallurgical ore processing provides high gold recovery (78.1%).

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Author Biographies

A.K. Koizhanova, Satbayev University, Institute of Metallurgy and Beneficiation

Candidate of Technical Sciences, head of the laboratory of special methods of hydrometallurgy. Satbayev University, Institute of Metallurgy and Beneficiation, 050010, st. Shevchenko, 29/133, Almaty, Kazakhstan.

G.V. Sedelnikova, JSC Rosgeologia

Doctor of Technical Sciences, Director of the Geotechnological Center Separate Subdivision, JSC Rosgeologia, Moscow, Russia.

M.B. Erdenova, Satbayev University, Institute of Metallurgy and Beneficiation

Master's degree, Junior Researcher, Laboratory of Special Methods of Hydrometallurgy, Satbayev University, Institute of Metallurgy and Beneficiation, 050010, st. Shevchenko, 29/133, Almaty, Kazakhstan.

A.N. Berkinbaeva, Satbayev University, Institute of Metallurgy and Beneficiation

Candidate of Technical Sciences, Head of the Chemical Analytical Laboratory, Satbayev University, Institute of Metallurgy and Beneficiation, Almaty, Kazakhstan.

E.M. Kamalov, Satbayev University, Institute of Metallurgy and Beneficiation

Senior Researcher, Laboratory of Special Methods of Hydrometallurgy, Satbayev University, Institute of Metallurgy and Beneficiation, Almaty, Kazakhstan.

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