某高硅低品位铜锌硫化矿浮选分离试验

Experiment on Flotation Separation of a High Silicon Low Grade Cu-Zn Sulphide Ore

某低品位高硅硫化铜锌矿中的铜矿物种类多,矿物嵌布粒度细,与脉石嵌布关系密切;锌矿物与铜矿物复杂共生,加之次生铜矿物溶解产生的铜离子会活化锌矿物,浮选分离困难。基于矿石特性,浮选试验采用碳酸钠作为矿浆pH调整剂,腐植酸钠、硫酸锌及亚硫酸钠作为锌矿物及脉石矿物的组合抑制剂,配合使用新研制的铜高效选择性捕收剂EMB-513,采用"一段磨矿-铜矿物优先浮选-选铜尾矿选锌"的工艺流程,实现了铜矿物及锌矿物的有效分离,闭路试验获得了铜品位27.31%、铜回收率86.35%的铜精矿以及锌品位50.94%、锌回收率78.11%的锌精矿。同时,矿石中的银、硒和镉等稀有稀散元素也得到了有效富集。

There are many types of copper minerals in a low-grade high-silicon copper-zinc sulfide ore,and the particles size of the minerals is fine,which is closely related to the gangue minerals. The zinc and copper minerals have complex paragenetic relationship and the copper ions produced by the dissolution of secondary copper minerals would activate zinc minerals,which makes the flotation separation more difficult. Based on the characteristics of the ore,the flotation tests were conducted using sodium carbonate as the pH regulator of the pulp,sodium humate,zinc sulfate and sodium sulfite as the combined inhibitors of zinc minerals and gangue minerals. In combination with the newly developed copper efficient selective collector EMB-513,the process of "one stage of grinding-priority flotation of copper minerals-zinc separation from copper tailings" was used to achieve the effective separation of copper minerals and zinc minerals. The copper concentrate with copper grade of 27.31%,copper recovery rate of 86.35% and zinc concentrate with zinc grade of 50.94%,zinc recovery rate of78.11% were obtained respectively. At the same time,the rare elements such as silver,selenium and cadmium in the ore were also effectively enriched.