关键词: 银, 多金属矿, 混合浮选, 氰化, 活化

Abstract: The silver polymetallic ore is a kind of refractory inter-grown copper-lead-silver-gold complex ore. A large number of research tests on beneficiation process consisting of mix-flotation，concentrate cyanidation，lead separation priority from cyanide residue and then copper have been carried out. The result shows that adding the leaching aid is of benefit to improve the recovery of gold and silver during the process of cyanide leaching. It is important to adopt a reasonable activator in order to activate copper and improve the copper recovery during cyanide residue flotation. After optimizing of reagent system in each link of process，the comprehensive recovery rate of gold reaches 80.80%，the silver recovery 72.03%，furthermore，the copper concentrate grade is up to 21.46% with the recovery of 70.80%.

Key words: Sliver, Polymetallic ore, Bulk flotation, Cyanide, Activation