FIELD: chemistry.
SUBSTANCE: method comprises biooxidation of concentrate biopulp dehydration to obtain a filter cake and its processing with the extraction of gold. Dehydration of biopulp is carried out by two-step centrifugation. In the resulting centrate after the first stage, just before adding the material in the working cavity of the screw decanter, Nalco Optimer 823IQ flocculant as a 0.2% solution at a rate of 600-700 g/ton of solids is added in the liquid fraction and passed to a second centrifugation step to obtain of supernatant with the content of gold thin slimy suspension 0.1-1.0 g/l.
EFFECT: reduction of thin gold-slimy slurry liquid fraction in a second centrifugation step.
1 tbl, 1 ex
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