Dechlorinate from Two Stage of Contaminated Acid Neutralizing Solution in Zinc Hydrometallurgy with Copper Slag
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.
万方数据
维普
