Research of Bacterial-Chemical Leaching of Gold from Technogen Tails of Flotation

Abstract

The article presents the results of studies of gold-containing technogenic raw materials
of one of the deposits of Kazakhstan. Considered the possibility of using preliminary
bacterial oxidation of flotation tailings using three strains of thionic bacteria
A.ferrooxidans isolated from the source ore of the Kazakhstan deposit before the
cyanidation operation in relation to gold-containing technogenic raw materials with the
aim of increasing gold recovery from them. Data is presented on the physiology of the
growth of thionic microorganisms during the biooxidation of flotation tailings. The results
are presented of studies on growth dynamics, changes in the pH of the medium, iron
oxidation, and the effect of microbial cells on the mineralogical composition of enrichment
tailings. According to the results of mineralogical analysis, it was revealed that mainly the
studied material consists of non-metallic material, represented by quartz (52-54%),
andesine (10-12%), microcline (18-20%), muscovite (2-3%), clinochlor and ribekite (4-
5%). According to the results of experimental studies, it was found that the process of
leaching of gold from biological oxidation residues is one of the effective technological
solutions.