METHOD FOR FLOTATION CONCENTRATION OF SULFIDE COPPER-NICKEL ORES

FIELD: mining. ^ SUBSTANCE: invention relates to concentration of minerals and may be used in processing of sulphide copper-nickel ores. Method includes double-stage grinding of ore in alkaline medium, collective flotation of sulfide minerals in the presence of sulfhydric collectors to produce collective copper-nickel concentrate and final tailings, final concentration of crude concentrates with additional grinding of collective concentrate. Initial feed arrives into cycle of ore preparation, including grinding and classification. Ground product arrives into I cycle of reagent treatment operations, including operations of contact with reagents: dispersant and depressor, and arrives into I main flotation. Foam product 1 of the main flotation arrives into cycle of desorption, including operation of desorption, operation of washing and operation of condensation, further material arrives into cycle of grinding and classification, including operation of classification, operation of additional grinding and operation of mechanochemical activation, then material arrives into III cycle of treatment with reagents, including operations of agitation with heating in the presence of dispersant and operation of agitation in the presence of depressor, then product is delivered into cycle of cleaning operations, including cleaning operation or cycle of cleaning operations performed in the presence of sulfhydric collector and foamer to produce 1st collective concentrate and tailings, which together with chamber product of I main flotation is sent to II cycle of ore preparation, including operation of classification, grinding, ground product arrives into II cycle of reagent treatment, including operations of contact with reagents: dispersant and depressor, and arrives to II main flotation carried out in the presence of sulfhydric collector and foamer to produce collective concentrate of II main flotation and final tailings. Foam product of II main flotation arrives into cycle of desorption, including operations of desorption, washing and condensation. Further product arrives into cycle of grinding and classification, including operations of classification and additional grinding of classification sands down to class of not less than 90% of class 74 micrometre. Further product arrives into IV cycle of reagent treatment, including operations of mechanochemical activation of ground product, operations of agitation with heating in the presence of dispersant and contact with depr