铜冶炼富铼渣提铼工艺

The Processof Extracting Rhenium from Rhenium Rich Slag in Copper Smelting

采用“富铼渣浸出—浸出液预处理—萃取—反萃—结晶”工艺流程,研究了铜冶炼富铼渣提铼工艺,着重考察浸出工序中H_(2)O_(2)用量、硫酸浓度、浸出时间和浸出温度等对铼浸出率的影响,以及预处理工序中CaO用量对铼、砷回收率的影响。结果表明:在50 g富铼渣、H_(2)O_(2)用量150 mL、初始液固比2、初始硫酸浓度20g/L、室温(20~25℃)搅拌浸出2 h的最优条件下,铼浸出率可达92.2%,砷浸出率达到96.6%;浸出液经过CaO预处理后,“预处理—萃取—反萃”工序铼总回收率超过98%,砷总回收率不到1.8%,实现了铼与砷的有效分离;一次结晶所得铼酸铵的纯度约为95%,铼结晶率为66%。

Rhenium extraction from rhenium rich slag in copper smelting was studied by the process of leaching of rhenium rich slag,pretreatment of leachate,extraction,stripping and crystallization.Effects of H_(2)O_(2) dosage,sulfuric acid concentration,leaching time and leaching temperature on rhenium leaching rate in leaching process,as well as the effect of CaO dosage on recovery of rhenium and arsenic in pretreatment process.The results show that the leaching rate of rhenium and arsenic is 92.2%and 96.6%respectively under the optimum conditions including rhenium rich slag of 50 g,H_(2)O_(2) dosage of 150 mL,L S=2,sulfuric acid concentration of 20g/L,leaching time of 2 h at room temperature(20-25℃).After pretreating of leaching solution with CaO,the total recovery rate of rhenium is more than 98%,and the total recovery rate of arsenic is less than 1.8%,which can effectively separate rhenium and arsenic.The purity of ammonium rhenate obtained in one step crystallization is about 95%,and the rhenium crystallization ratio is 66%.