内蒙古某湿法炼锌渣选银试验

内蒙古某湿法炼锌浸出渣-75μm含量为92.48%,银含量达217.98 g/t,75.51%的银以金属银、硫化银及硫化物包裹银的形式存在,且90%以上的银分布在-75um粒级中。为高效回收该二次资源中的银,采用浮选工艺进行了选矿试验研究。结果表明,以活性炭为微细粒银矿物浮选的载体和溶解银的吸附剂,采用1粗2扫3精、中矿顺序返回流程处理该湿法炼锌浸出渣,可获得银品位为4 084.18 g/t、银回收率为79.63%的银精矿。该试验流程简单、高效、生产成本低,可作为银回收系统设计的依据。

Silver Recovery from a Zinc Hydrometallurgy Residue in Inner Mongolia

There is 217.98 g/t of silver in a zinc hydrometallurgy leaching residue of Inner Mongolia with particle size of 92.48% -75 μm.75.51% silver is present in the form of metallic silver,silver sulfide and silver sulfide inclusions,and more than 90% silver is distributed in -75 μm fraction.Beneficiation experiments of flotation process are carried out in order to high efficiently recover the silver of the secondary resources.The results show that by using activated carbon as carrier of micro-fine silver mineral flotation and sorbent of dissolved silver,silver concentrate with silver grade of 4 084.18 g/t and recovery of 79.63% was obtained on disposing the zinc hydrometallurgy leaching residue with the closed-circuit flotation processing of one roughing,three cleaning,two scavenging,and middlings return to the flow-sheet in order.The process has characteristics of simple,efficient and low cost,and can be the basis for design of silver recovery system.