某铜冶炼渣中铜、铁的综合利用回收研究

Study on Comprehensive Recovery of Copper and Iron in a Copper Smelting Slag

湖北某铜冶炼渣Cu、Fe含量分别为2.11%和40.07%,主要杂质成分SiO_(2)含量为30.89%,铜主要以硫化铜的形式存在,铁主要以磁性铁的形式存在。为高效回收试样中的铜、铁,对高效、合理回收工艺进行了试验研究。结果表明,试样在磨矿细度-74μm占85%的情况下,采用1粗1精1扫、中矿顺序返回流程浮选,浮选尾矿2次弱磁选,最终可获得铜品位24.78%、回收率88.55%的铜精矿,铁品位64.12%、回收率82.52%的铁精矿;采用2次弱磁选,弱磁选尾矿1粗1精1扫、中矿顺序返回流程浮选,最终可获得铁品位64.78%、回收率85.91%的铁精矿,铜品位24.86%、回收率62.33%的铜精矿。先浮后磁工艺的铜回收率显著较高,因而是理想的铜、铁回收工艺。

The contents of Cu and Fe in a copper smelting slag in Hubei are 2.11%and 40.07%,re⁃spectively.The content of main impurity component SiO_(2) is 30.89%.Copper mainly exists in the form of cop⁃per sulfide,and iron mainly exists in the form of magnetic iron.In order to recover copper and iron in the sample efficiently,an efficient and reasonable recovery process was studied.The results showed that under the condition of grinding fineness of-74μm accounting for 85%,the copper concentrate with copper grade of 24.78%and recovery rate of 88.55%and the iron concentrate with iron grade of 64.12%and recovery rate of 82.52%can be obtained after twice low-intensity magnetic separation for flotation tailings treated by one roughing,one cleaning and one scavenging,and the medium ore are returned to the process in se⁃quence.Adopting twice low-intensity magnetic separation,the iron concentrate with iron grade of 64.78%and recovery rate of 85.91%,and the copper concentrate with copper grade of 24.86%and recovery rate of 62.33%were obtained after one roughing,one cleaning and one scavenging the medium ore are returned to the process in sequence for the low-intensity magnetic separation tailings.The copper recovery rate of the pre-flotation and post-magnetic process is significantly higher,so it is an ideal recovery process for copper and iron.