METHOD OF DRESSING MAN-MADE MINERAL STOCK OF NONFERROUS METALS Russian patent published in 2013 - IPC B03D1/02 C22B7/00 C22B11/00 C22B15/00 

FIELD: process engineering.

SUBSTANCE: invention relates to flotation of man-made stock. Method of flotation of sulfide ores of nonferrous and noble metals comprises conditioning crushed ore with dithiophosphate solution or other sulfhydric collectors in lime medium and flotation. Note here that for reduction in floatability of pyrite and increase in extraction of metal up to 10 wt % of thiourea ((NH₂)₂CO) or its derivatives are preliminary introduced in the solution of dithiophosphate as a modifying agent. Then, pulp from ore is conditioned, first, with modified dithiophosphate at pH 8.5-9.0 for 3-5 minutes and, then, with, xanthate at pH over 9.0 for 1.0 minute. Then flotation of sulphides of nonferrous metals and mineral forms of noble metals at input of modified of dithiophosphate and xanthate varying from 1:3 to 3:1, respectively.

EFFECT: reduced floatability of pyrite and other iron sulphides, increased floatability of nonferrous metal minerals, native gold particles and its exposed concretions with sulphides.

3 tbl, 3 ex