关键词: 铅锌尾矿, 尾矿再选, 铅锌分离, 优先浮选

Abstract: The grades of lead,zinc and silver in a lead-zinc flotation tailings from Fujian are 0. 23%,2. 11% and 36. 3 g / t,respectively,among which zinc and silver have high recovery value. The main metallic minerals in the tailings are sphalerite,pyrite and galena,and the non-metallic minerals are mainly calcite and quartz. According to the characteristics of ore,preferential flotation was used to carry out the process optimization test. The results showed that:under the condition of grinding finness of -0. 074 mm accounting for 69. 92%,using lime as pH regulator,zinc sulfate as inhibitor,ethylthio-nitrogen as collector and 2# oil as foaming agent,silver-lead concentrate with lead grade of 4. 56%,silver grade of 320 g / t and lead recovery rate of 15. 55% and silver recovery rate of 6. 63% can be obtained through one roughing,three cleaning and one scavenging for lead flotation. With lime as pH regulator,copper sulfate as activator,butyl xanthate as collector and 2# oil as foaming agent,zinc concentrate with zinc grade of 37. 32%,silver grade of 152 g / t,zinc recovery rate of 73. 25% and silver recovery rate of 18. 80% was obtained through one roughing,three cleaning and two scavenging for zinc flotation. The test index is good and would provide data support for the comprehensive utilization of the tailings.