The development of technological schemes for tank bio-hydrometallurgical process of refractory gold-bearing sulfide materials

摘要

Presents the results of tests tank bio-oxidation of sulfide flotation concentrates, with two-stage schemes, which include gravitational separation biopulp between stages. Research conducted on a sample of flotation concentrate containing; 20% arsenopyrite, 35% pyrrhotite, 8%pyrite, 7% stibnite. It is shown that the use of gravity separation biopulp after the first stage of oxidation (70 - 90 hours) , can reduce the amount of material coming into the side stage of the bio-oxidation in 2 - 2. 5 times. This allows us to increase the productivity of the entire process tank of bacterial oxidation of sulfide flotation concentrates, to intensify the process and increase the extraction of Au with a further cyanidation (95% ), due to increased oxidation of minerals in the second stage of the biooxidation. Research of technological schemes has carried out in an enlarged scale with the use of " industrial" culture of moderately thermophilic microorganisms, as well as methods for displaying an intensification of the second stage of oxidation bio-pulp (sand cyclone) , allowing to increase the degree of oxidation. Tests using two-stage schemes have shown that the performance of the tanks of bacterial oxidation of arsenopyrite-pyrrhotite hard flotation concentrates can be increased by 20% — 30% with an increase in gold recovery during cyanidation further to 95%.