FIELD: chemistry.
SUBSTANCE: method includes enrichment of sludge by hydrocycloning, filtration of an obtained pre-concentrate, which represents a mixture of large fractions of a sedimentary and a part of a floated material, dehydration, drying, granulation, drying. To hydrocycloning supplied is sludge with a ratio of S:L=1:2. Hydrocycloning is carried out in 4 stages. Discharges of each stage of hydrocycloning are combined in the pre-concentrate. An initial pulp is supplied to the first hydrocyclone at a temperature of 50÷70°C and under pressure of 2.5÷4 atm. A ratio of sand muzzle to the draining one in all the hydrocyclones constitutes 0.5÷0.66:1. Drying of granules is realised at a temperature up to 150°C to avoid loss of noble metals in sublimates.
EFFECT: maximal extraction of noble metals from the obtained concentrate.
4 cl, 5 tbl
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