关键词: 次生蓝辉铜矿, 铜硫混浮, 铜硫分离, 中矿集中再磨

Abstract: A digenite ore from Jiangxi contains only 0.30% copper.Primary copper sulfide accounts for only 6.67% of the total copper，while secondary copper sulfide content is 80.00%.Digenite mainly exists among gangue or pyrite grains in shape of irregular granular aggregate.Liberation from pyrite is easy for most of digenite ores except the fine digenite.For the efficient recovery of the ore resources，beneficiation tests were conducted.The results showed that:at the grinding fineness of 70% passing 200 mesh，through the process of one roughing-two cleaning and one scavenging Cu-S bulk flotation，one roughing-two cleaning-one scavenging separation flotation between pyrite and copper sulfide for Cu-S mixed concentrate，middlings returned in order (tailings of the first cleaning and concentrates of the scavenging mixed，and reground to 85% passing 325 mesh and then returning)，copper concentrate with 20.29% Cu，42.97% S，and copper recovery of 71.02%，sulphur concentrate with 0.28% Cu，37.42% S，and sulphur recovery of 80.04% is obtained separately.Good recovery of copper and sulfur was achieved.

Key words: Secondary digenite, Bulk flotation of Cu-S, Separation flotation between pyrite and copper sulfide, Middlings being gathered and reground