四川某金浸渣浮选回收金试验

Experiment on Gold Recovery by Flotation from a Gold Leaching Residue in Sichuan

四川某金精粉全泥氰化浸渣-29μm占80.23%,金品位为4.02 g/t,裸露及半裸露连体金占总金的40.69%,硫化物包裹金占4.66%,其他金主要赋存在石英及硅酸盐矿物中。为回收该二次资源中的金,进行了选矿试验研究。结果表明,试样采用浮选工艺流程处理,1次浮选粗精矿磨至-29μm占87.5%后进行4次精选,粗选尾矿2次扫选闭路流程处理,最终获得金品位为34.20 g/t、回收率为43.49%的精矿。结合试样金物相分析结果,裸露、半裸露金及硫化物包裹金得到了较充分的回收。

The full slime cyanidation leaching residue of a gold concentrate powder in Sichuan is with fineness of-29μm accounting for 80.23%,and the gold grade is 4.02 g/t.The bare and semi-bare conjoined gold accounts for 40.69%of the total gold,and the sulfide inclusion gold accounts for 4.66%.Other gold mainly occurs in quartz and silicate minerals.In order to recover the gold from the secondary resource,beneficiation experiments were carried out.The results showed that the sample was treated by flotation process,one flotation coarse concentrate was grinded to-29μm accounting for 87.5%and then selected for four times,and the roughing tailings were scavenged twice in the closed-circuit.Finally,gold concentrate with gold grade of 34.20 g/t and recovery rate of 43.49%was obtained.Combined with the results of gold phase analysis,bare and semi-bare gold and sulfide inclusion gold were fully recovered.