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Study on Different Depressants to Influence on Chalcopyrite Flotation

Depressants used in flotation can inhibit floatable gangue minerals to improve concentrate grade. In this paper, four different commonly used depressants were adopted in order to investigate the effect of depressants on chalcopyrite index and to investigate their inhibition effects on chalcopyrite flotation.The experimental results indicate that, in the flotation system of natural pH of pulp, mixed reagent of xanthate and aerofloat, sodium hexametaphosphate has the best effect on chalcopyrite separation, and the dosage range is 1.5-1.5kg/t, it can improve the concentrate recovery as well as concentrate grade. In the range of 0.5-2.5kg/t, sodium silicate can improve the concentrate grade and concentrate recovery, but the amplitude is small. CMC can improve the concentrate grade while lower the concentrate recovery. The effects of dextrin on concentrate grade and concentrate recovery is not so obvious.