The analysis of comprehensive recovery experiments of Cu2+and Au in the pyrite cinder washing solution
The daily output of pyrite cinder washing solution,which contains valuable Au and Cu2+,in a gold smelter in Yunnan is vey large.The recovery of Cu2+and Au from the washing solution of pyrite cinder by using a new technique of iron powder replacement combined with microporous gold interception has great economic value and environmental benefits.In this paper,we have studied the effects of pH value,iron powder dosage,and replacement time on the recovery rate of Cu2+and Au from the washing solution of pyrite cinder in the iron powder replacement process,and explored the effects of micropore size(2μm,1 μm,<1 μm)on the interception and retention of gold particles in the microporous filtration process.The experimental results show that the replacement rate of Cu2+in the washing solution of pyrite cinder was 98.88%under the conditions of pH value of 3,iron powder dosage of 6g/L,and reaction time of 2.5h.The replacement effect is excellent.When the pore size is less than 1μm,the recovery rate of Au was 99.47%.The new technique of iron powder replacement combined with microporous gold interception has advantages of high recovery rate,low material consumption,low cost and obvious economic benefits for recovering Cu2+and Au from the washing solution of pyrite cinder.