用铜渣从湿法炼锌污酸两段中和后液中脱除氯

Dechlorinate from Two Stage of Contaminated Acid Neutralizing Solution in Zinc Hydrometallurgy with Copper Slag

湿法炼锌中产生的污酸经硫化、锌焙砂中和、碳酸钙中和后可去除砷、氟,同时还可有效减少石膏渣产量,但中和后液中氯含量较高,无法返回至湿法系统重复利用。研究了采用铜渣除氯法去除该溶液中的氯,结果表明:在过氧化氢加入量2.3 mL/L、铜渣系数6.8、初始酸质量浓度15 g/L、温度35℃条件下反应2 h,溶液中的氯可由0.62 g/L降至0.17 g/L,氯脱除率为72.58%,溶液铜质量浓度为2.69 g/L,通过锌粉或铁粉回收铜后溶液可返回至湿法系统中重复利用。

After contaminated acid in zinc hydrometallurgy was vulcanized,neutralized by zinc calcine and calcium carbonate,arsenic and fluorine can be removed from the solution,and the amount of gypsum residue decreased.But the solution can not return to zinc hydrometallurgy system because it has a high chlorine content.The chlorine in the solution was removed with copper slag.The results show that under the conditions of hydrogen peroxide addition of 2.3 mL/L,copper slag coefficient of 6.8,initial acid mass concentration of 15 g/L,temperature of 35℃and reaction time of 2 h,the chlorine removal rate is 72.58%and the chlorine mass concentration decreases from 0.62 g/L to 0.17 g/L.The copper mass concentration in solution is 2.69 g/L copper,and it can be returned to the zinc hydrometallurgy after subsequen copper removal by zinc powder or iron powder.