铜渣中铁铜回收的试验研究

Research on Recovery of Iron and Copper in Copper Slag

安徽某铜渣有价金属铜以氧化铜形式存在为主,另含11.45%磁性氧化铁,确定首先磁选回收铁,然后对磁选尾矿浸出、萃取、结晶回收铜。结果表明,在一段磨矿细度为-0.074 mm 80%,磁场强度为234 kA/m,再磨细度为-0.037 mm 90%,磁场强度为93.6 KA/m条件下可获得铁品位61.45%,回收率32.96%的铁精矿,产品达到C60质量标准要求,且大幅降低了铁对后续工艺的干扰;100g磁选尾矿在硫酸用量120 g、双氧水用量20 mL、固液比1:7、温度80℃、搅拌2 h条件下,铜的浸出率达80%,随后浸出液在O/A=1:1,萃取剂含量30%,水相pH值为3,经过3级萃取、反萃和结晶,可获得铜品位24.65%,回收率88.79%的五水硫酸铜,产品纯度高。

Copper oxide is the main form of valuable copper in a copper slag in Anhui Province,which contains 11.45% magnetic iron oxide.It is determined that iron is recovered by magnetic separation first,and then copper is leached,extracted and crystallized from the magnetic separation tailings.The results show that iron concentrate with 61.45% iron grade and 32.96% recovery can be obtained under the conditions of grinding fineness-0.074 mm is 80%,magnetic field strength 234 KA/m,and re-grinding fineness-0.037 mm is 90%,magnetic field strength 93.6 KA/m.The product meets the C60 quality standard and greatly reduces the interference of iron to the follow-up process.The leaching rate of copper from 100g magnetic separation tailings reached 80% under the conditions of 120 g sulfuric acid,20 ml hydrogen peroxide,1:7 solid-liquid ratio,80℃and 2 h stirring.Subsequently,the leachate at O/A=1:1,30% extractant content and 3 pH value in aqueous phase,add 3 stages of extraction,stripping and crystallization,a copper grade of 24.65% and a recovery rate of 88.79% of copper sulfate pentahydrate can be obtained,which has high purity.