电锌工艺中铜渣除氯应用实践

Application practice of copper slag chlorine removal in electric zinc process

以锌粉与久置的铜镉渣为原料,利用铜渣除氯原理去除电锌工艺系统中的氯,研究工艺参数对氯脱除率的影响。结果表明,采用硫酸铜溶液和锌粉置换生成的新制活性铜粉进行电锌工艺中铜渣除氯,氯的脱除率达77%~81%,温度影响不大。采用久置铜镉渣洗液提供铜离子,用锌粉置换铜离子生成的活性铜粉进行铜渣除氯时,氯的脱除率随n(Cu)T/n(Cl^-)比值的增大而升高。当n(Cu)T/n(Cl^-)比值从4增加到12时,氯的脱除率从72.66%提高至87.98%。对于久置的铜镉渣制备的铜渣,其中的铜已失去和铜离子、Cl^-反应生成氯化亚铜的活性,因此通过调节温度、pH值、n(Cu)T/n(Cl^-)比值均不能有效地脱除溶液中的Cl^-。

Zinc powder and long-standing Cu-Cd residue were used as raw materials to remove chlorine in the electric zinc process based on the principle of removing chlorine from copper slag.The effect of process parameters on chlorine removal rate was studied.The results show that the copper slag is dechlorinated in the electric zinc process by using copper sulfate solution and zinc powder replacement,and the removal rate of chlorine is 77%-81%,and the effect of temperature is not obvious.Copper ions are provided by the washing solution of long-standing Cu-Cd residue,and zinc powder is used to displace copper ions to produce active copper powder for chlorine removal of copper slag.The removal rate of chlorine increases with the increase of n(Cu)T/n(Cl^-)value.When n(Cu)T/n(Cl^-)value increases from 4 to 12,the removal rate of chlorine increases from 72.66%to 87.98%.The copper has lost its activity of reacting with copper ions and chloride ions to form cuprous chloride.Therefore,the Cl^-in the solution cannot be effectively removed by adjusting temperature,pH value and n(Cu)T/n(Cl^-).