湿法炼锌过程中铜渣除氯试验研究

Study on the chlorine removal by copper slag in the zinc hydrometallurgy

本文研究了新制活性铜粉与长期存放后的铜渣用于湿法炼锌系统中氯的脱除条件。结果表明:采用硫酸铜和锌粉置换生成新制活性铜粉进行铜渣除氯,氯的脱除率达77%~80%,且随温度变化不大;采用铜镉渣洗液提供铜离子,锌粉置换铜离子生成活性铜粉进行铜渣除氯时,氯的脱除率随n(Cu)T/n(Cl-)比例的增大而升高,当n(Cu)T/n(Cl-)从4∶1增加到12∶1时,氯的脱除率从72.66%升高至87.98%;用久置的铜镉渣制备的铜渣,因铜已经失去和铜离子、氯离子反应生成氯化亚铜的活性,通过调节温度、pH、n(Cu)T/n(Cl-)比例等均不能有效地脱除溶液中的氯离子。

In the study,dechlorination conditions of active copper powder and stored copper slag used for zinc hydrometallurgy were separately studied.The results showed that when the active copper powder generated from the chemical reaction of copper sulfate with zinc powder is used,the Cl-removal rate of is 77%~80%,and it does not change much with temperature.When the copper cadmium slag washing liquid is used to provide copper ions,and the zinc powder replaces the copper ions to generate active copper powder for the chlorine removal from copper slag,the Cl-removal rate increased from 72.66%to 87.98%when n(Cu)T/n(Cl-)increased from 4∶1 to 12∶1.When copper slag prepared with long-term copper cadmium slag is used,the chloride ions in the solution can not be effectively removed by adjusting temperature,pH,n(Cu)T/n(Cl-)ratio,etc.,because copper has lost its activity to form cuprous chloride by reacting with copper ions and chloride ions.