西北某高铅银浸锌渣中银的浮选回收试验

Silver Recovering Experiment by Flotation on a High Lead Silver Zinc Leaching Residue in Northwest

西北某冶炼厂的高铅银浸锌渣含银198.20 g/t,银主要以硫化银和金属银的形式存在,其次为氧化银、硅酸盐中银和其他银,银主要分布在53~20μm粒级,分布率高达71.48%。为高效开发利用该二次资源,对浮选选银工艺条件进行了研究。结果表明,试样在磨矿细度为-0.037 mm占90%的情况下,以Na_2S为Zn^(2+)去除剂和氧化银的活化剂,CuSO_4为含银闪锌矿的活化剂,丁铵黑药为捕收剂,MIBC为起泡剂,采用1粗1扫2精、中矿顺序返回流程处理,获得了银品位为1 316.80 g/t,银回收率为72.02%的银精矿。

There is 198. 20 g/t silver in a high lead silver zinc leaching residue from smelting plant of Northwest. Silver mainly exists in form of silver sulfide and metallic silver,followed by silver oxide and silicate and other forms,silver are mainly distributed in 53～20 μm fraction,the distribution rate is as high as 71. 48%. For high efficient development and utilization of the secondary sources,the technological conditions for the flotation of silver were studied. Results show that at grinding fineness of-0. 037 mm 90%,using Na_2S as Zn^（2＋） remover and silver oxide activator,CuSO_4 as activator of silver-bearing sphalerite,ammonium aerofloat as collector,MIBC as frother,via one roughing-two cleaing-one scavenging,silver concentrate with silver content and recovery of 1 316. 80 g/t and 72. 02% respectively can be obtained.