FIELD: radio engineering, communication.
SUBSTANCE: raw materials are crushed and concentrated via electrical and magnetic separation methods; noble metals are extracted from the obtained concentrates; concentration tailings are pulped in water with liquid:solid ratio of not less than 7 in the presence of lignosulphonate with consumption of the latter of 1-3 kg/t of solid matter. Fine particles of noble metals are extracted from the obtained pulp by floatation, wherein as the collector sodium dialkyl dithiophosphate BTF-1522 with consumption of 50-500 g/t is used, and floatation is carried out in a weakly acidic medium at pH 3-4.
EFFECT: improved extraction of noble metals into commercial-grade concentrates.
1 tbl, 1 ex
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