Abstract: Hydrocyclone, as a new efficient separation device, has wide application prospect. In mining industry, many concentrators have begun to use hydrocyclones in the primary closed-circuit grinding-classification operation. However, the combination of grate-type ball mill and hydrocyclone in the primary classification operation has not seen successful application. The paper describes the industrial test and results of the primary closed-circuit grinding-classification operation using hydrocyclone and grate type ball mill. The practice shows that this grinding-classification system has achieved remarkable improvement in overflow fineness, classification efficiency, circulation load and grinding efficiency.

Key words: Hydrocyclone, Grate-type ball mill, Closed-circuit grinding-classification