含可溶性铜盐难处理金银矿石预处理—浮选—氰化试验研究

Experimental research on the pretreatment-flotation-cyanidation of refractory gold-silver ores containing water soluble nantokite

针对含可溶性铜盐难处理金银矿石性质,进行了提金试验研究,并考察了洗涤过程中铜矿物的溶解规律及铜在氰化反应体系中的浸出规律。结果表明:矿样采用预处理—浮选—氰化工艺进行处理,可获得较好试验效果;矿样经过水洗除铜后,采用浮碳药剂及新型复合捕收剂进行浮选,可有效降低尾矿金品位;浮选精矿采用氰化贫液磨矿,并加入NaOH调节pH>10,可明显降低NaCN消耗量,由直接氰化的110 mL降低至70 mL,且Au浸出率达94.8%、Ag浸出率91.0%。

Experimental research was carried out on the gold extraction from a refractory gold-silver ores containing water soluble nantokite and the ways in which copper minerals dissolve in washing and copper is leached in cyanidation systems were investigated.The results show that the ores treated by pretreatment-flotation-cyanidation can have good index;after the ore samples are washed to remove copper,carbon flotation reagent and new type composite collector are used for flotation,which can effectively reduce the gold grade in tailings;flotation concentrates are grinded with cyanidation barren solution while NaOH are added to adjust pH>10,by which the NaCN consumption can be greatly reduced,from110mL,for direct cyanidation,to70mL,and Au leaching rate can reach94.8%and Ag leaching rate91.0%.