Abstract
The influence of the environment and bacterial cultures on the degree of gold leaching from Au-containing raw materials of different compositions, origins, and with different contents of gold, selected in the Ural Federal District (Russia), was determined. The leaching degree was determined according to the change of the gold concentration in the ore by means of mass-spectrometry with inductively-coupled plasma. It was demonstrated that the degree of Au bioleaching from carbonaceous-argillaceous slates, containing 2.17 g/t of gold, and from pyritic technogenic raw materials, containing 1.15 g/t, when holding them in peptone water and Leten medium reached 92.17% and 87.83%, respectively.
Highlights
Nowadays, many deposits of polymetallic ores and nonferrous metals are depleting, and spoils of mineral resource and metallurgy industries are accumulating
Owing to the depletion of known gold deposits, there is an acute need for its extraction from natural and technogenic raw materials
The purpose of the present work is to study the mineral composition of Au-containing raw materials; carbonaceous-argillaceous slates and pyritic technogenic raw materials selected in the Ural Federal District (Russia), as well as the determination of the influence of the bioleaching technique (1—stimulation of the natural microbiome; 2—application of enrichment cultures) and the composition of the nutrient medium on the degree of leaching of gold from Au-containing ores of different compositions, origins, and with different contents of gold
Summary
Many deposits of polymetallic ores and nonferrous metals are depleting, and spoils of mineral resource and metallurgy industries are accumulating. Backman [2] estimates that the reserves of such metals as Cu, Pb, Mn, Ag, Sn, and Zn will be exhausted within 50 years, and Fe, Ni, and U in 100 years Estimates like these emphasize the need for developing new, more efficient methods of extracting metals from natural and technogenic raw materials. Owing to the depletion of known gold deposits, there is an acute need for its extraction from natural and technogenic raw materials. Lean Au-containing carbonaceous-argillaceous slates and Au-containing wastes of ore mining and processing, metallurgical production, including spoils of base ores, mill tailings, slags, and slimes, draw increasingly greater attention as the potential raw materials for the extraction of gold [3,4,5].
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