Abstract: In view of the problem of high tailing grade in a copper smelting slag concentrator,a large number of technological parameter conditions tests were carried out.The results show that the flotation index is the best under the conditions of first stage grinding fineness -74 μm content 64.8%,second stage grinding fineness -45 μm content 90.1%,rapid flotation Z-200 dosage 440 g/t,rapid flotation 2# oil dosage 140 g/t,second stage flotation Z-200 dosage 140 g/t.At the same time,in order to improve the grinding fineness,the revamping of the sand return trough of the first stage grinding is carried out,and the control parameters of grinding medium have been optimized.In production,when the slag contains 4.237% copper,the concentrate grade is 20.696% and the tailings grade is 0.286% can be obtained.

Key words: Copper smelting slag, Grinding fineness, Collector, Foaming agent, Concentrate grade, Tailing grade, Grinding efficiency