Regularities of low-grade copper-nickel ores grinding in dram mills

The paper presents the investigation results of grindibihty of copper-nickel ore sample, differences in the behavior of nanow grain size categories using rod and ball mill grinding. The characteristic mechanisms of destruction of the categories have been identified; the energy input on grinding has been estimated. Basing on the obtained data the choice of a two-stage scheme of grinding with rod mill at the first stage, and the ball mill at the second one for efficient ore preparation for flotation has been substantiated.