锌粉置换回收锑精矿碱浸液中的金

Recovery of gold from alkali leached solution of antimony concentrate by replacement of gold with zinc powder

锑精矿碱浸液是湿法处理锑精矿产生的中间产物含有少量的金,必须回收。以山东某公司锑精矿碱浸液为原料,经多种提取剂对比,采用锌粉置换回收其中的金。考察了锌粉用量、料液pH、浸出温度、时间的影响,得到的最佳工艺条件为:锌粉用量4.0 kg/m^(3),溶液pH=11,反应时间3 h,反应温度80℃,多批次试验金回收率88%。工艺过程简单,经济性可行,有效解决了资源浪费问题,为锑精矿碱浸液回收金提供了一条新的工艺。

Wet treatment of antimony concentrate using alkali leaching produces an intermediate solution which contains a small amount of gold to be recovered.This kind of solution from a Shandong-based company was used as the research object and the replacement of gold with zinc powder was chosed after different extractants had been tested and compared.The effects of the zinc powder dosage,pH of the feed solution,leaching temperature and time on the recovery efficiency were investigated.The optimum zinc powder dosage and pH value of the solution was determined to be 4.0 kg/m^(3) and 11,respectively.When the recovery process was carried out at 80℃for 3 h,a gold recovery of 88%was achievd,based on several batch tests.The process is technically simple and economically feasible,displaying a great potential for industrial application.