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Research of hydrometallurgical method of leaching gold from flotation tails with using bio-oxidation

2020; Volume: 314; Issue: 3 Linguagem: Inglês

10.31643/2020/6445.24

2616-6445

Aigul Koizhanova, G. Toktar, Craig E. Banks, David Magomedov, Alibek Kubaizhanov,

Mining Techniques and Economics

This paper shows the results of the comparative study of the efficiency of gold extraction methods from technogenic flotation tails by agitation cyanidation and biooxidation followed by leaching. A representative sample of flotation tails was taken at gold extraction plant of Altyntau Kokshetau LLP. It was established that in the test sample contains 0.47 g / t Au and 0.62 g / t Ag. The gold extraction degree from flotation tailings with 80% content of 0.071 mm fraction was 50%, and that with 90% content of 0.071 mm fraction was 60%. Gold extraction plant's flotation tailings grinded to 0-0.044 mm fraction with sodium peroxide were subjected to pre-oxidation. The gold extraction degree from flotation tailings with 90% content of 0.044mm fraction at a solid-liquid ratio of 1:4 and a cyanide concentration of 1 g/dm3 is 65.2%. By using an active strain of thionic cultures the gold extraction degree was 72.1%