高氟氯氧化锌烟尘湿法脱氟氯的试验研究

Studies on Removing F and Cl by Wet Method Using Zinc Dust with High Content of F and Cl

本文对含Zn56％、F0．8％、C14．0％的氧化锌烟尘采用湿法洗涤脱除氟氯进行了研究。试验结果表明，在液固比1．5：1、温度为25℃、时间30min、搅拌速度300r／min、Na2CO3加入率8．5％的条件下，经过五级逆流湿法洗涤后，得到的洗涤渣含F、C1分别降低到0．06％和0．11％，F、Cl脱除率分别达到92．8％和97．2％；对脱氟氯洗涤烟尘的三段逆流浸出试验结果表明，浸出液的Zn^2＋、F-、Cl-含量可以满足锌电解新液的基本质量要求。

Removal of fuorine and chlorine from zinc oxide dust （Zn56%. F0. 8%. Cl4. 0%） by alkaline cleaning with sodium carbonate were studied in this paper. The results show that F and C1 removal rates are 92. 8% and 97. 2% respectively under the optimum conditions including ratio of liquid to solid of 1.5 ： 1, temperature of 25℃, washing time of 30 min, mix- ing speed of 300 r/min, and sodium carbonate addition is 8. 5% of zinc oxide dust quantity. After 5--stage reversal flow clean- ing, the F and Cl of residue can be reduced to 0. 06% and 0. 11% respectively. The Zn^2＋ , F- , Cl- content of the leaching liq- uid from 3--stage of countercurrent leaching can meet the basic quality of zinc electrolysis.