某毒砂金矿硫氰酸盐氨性体系加压氧化提金探索试验

对某毒砂金矿进行了硫氰酸盐氨性体系氧压提取金的探索试验,考察了反应温度、Cu2+浓度、浸出时间、液固比、氨水浓度、氧分压和硫氰酸铵浓度等对金浸出率的影响。结果表明,在下述优化条件下金浸出率为61.7%,即硫氰酸铵浓度3mol/L,液固比5∶1,反应温度150℃,浸出时间6h,搅拌速度750r/min,氨水浓度4.64mo/L,铜加入量1.5g/L。而经400℃焙烧预处理后金浸出率达到86.2%。

Exploration Test on Gold Extraction from Arsenopyrite Gold Concentrate with Oxidation Pressure Leaching Process in Ammonium Thiocyanate-Ammonia System

The exploration test on gold extraction from arsenopyrite gold concentrate with oxidation pressure leaching process in ammonium thiocyanate-ammonia system was performed.The effects of leaching temperature,copper concentration,leaching time,ratio of liquid to solid(L/S),ammonia concentration,oxygen pressure,and the concentration of ammonium thiocyanate on gold leaching rate were studied.The results show that the gold leaching ratio is 61.7% under the optimum conditions including NH4SCN concentration of 3 mol/L,L/S=5,leaching temperature of 150 ℃,leaching time of 6 hours,stirring speed of 750 r/min,ammonia concentration of 4.64 mol/L,and copper dosage of 1.5 g/L.The gold leaching ratio can leach 86.2% after the pretreatment of roasting at 400 ℃.