METHOD FOR FLOTATION OF REFRACTORY COMPLEX ORES OF NOBLE METALS Russian patent published in 2017 - IPC B03B7/00 B03D1/02 C22B11/00 

FIELD: mining engineering.

SUBSTANCE: method of flotation of refractory complex ores of noble metals includes grinding refractory complex ore of noble metals down to 0.1-0.5 mm, directing it to gravitational differentiation with the formation of conditionally called "heavy", "intermediate" and "light" fractions having different physical properties in terms of density, size and morphology of the disclosed particles and mineral phases, and flotation of these fractions in separate cycles to obtain a combined gold-containing sulphide concentrate. Gravitational differentiation is done on screw units with a large area of the separation surface and applying centrifugal forces. With the gravitational differentiation, the outputs of the "heavy", "intermediate" and "light" fractions are maintained close to the percentage ratio of 10:45:45, respectively. The "heavy", "intermediate" and "light" fractions of gravitational differentiation enter flotation in separate cycles in a closed circuit with basic and control operations. If necessary, the "heavy" fraction of gravitational differentiation is re-milled prior to the flotation. If necessary, the combined gold-containing sulphide concentrate is recleaned. The flotation of fractions of gravity differentiation is carried out at a pulp pH of 5.5, a pulp density of 30% solid, a liquid glass rate of 400-500 g/t, a butyl xanthate of 250-300 g/t, pine oil of 70-80 g/t, polyacrylamide when flotation of the "light" fraction is 8-10 g/t with a dosage in control operations twice smaller than the amount of collector and foaming agent, and in recleaning - three times smaller than the quantity of reagents.

EFFECT: increase of efficiency of enrichment of refractory complex ores of noble metals with an increase of qualitative and quantitative parameters of processing and reduction of losses of valuable components.

7 cl, 2 ex