P204萃取脱除锌浸出液中氟氯

采用P204萃取含氟、氯的锌浸出液,锌萃取率大于95%,反萃率高于99%,回收率高于98%,氟、氯脱除率均高于99%。P204萃取锌浸出液的工艺条件为:皂化率65%、锌料液pH=4.0、萃取温度40℃、相比O/A=2、萃取时间5min。锌电解废液反萃锌的工艺条件为:H2SO4 120g/L、反萃温度40℃、相比O/A=0.5、反萃时间5min。萃取、反萃温度控制在40~45℃,可避免出现有机相乳化和分相时间长等问题。串级试验萃余液含锌2.42g/L、氟0.52g/L、氯1.42g/L,经沉氟、沉氯处理后,氟、氯浓度分别降低到0.042g/L、0.079g/L,可返回锌冶炼系统配入浸出、净化使用。

Removal of Fluorine and Chlorine from Zinc Leaching Solution by P204 Extraction

Fluorine and chlorine were removed from zinc leaching solution by P204 extraction.Zinc extraction efficiency is 95% above,stripping efficiency is 99% above,and recovery efficiency is 98% above.Fluorine and chlorine removing efficiency is both over 99%.The optimum extraction conditions include saponification efficiency of 65%,zinc feed liquid pH=4.0,extracting temperature of 40℃,O/A=2,and extracting time of 5 min.The optimum stripping conditions include H2SO4 concentration of 120 g/L,temperature of 40℃,O/A=0.5,and stripping time of 5 min.Organic phase emulsification and long time phase separation can be avoided under temperature of 40-45℃.Concentration of Zn,F,Cl in raffinate of cascade test is 2.42,0.52,and 1.42 g/L,respectively.F and Cl concentration drops to 0.042 g/L and0.079 g/L after precipitating.The raffinate can be reused in zinc leaching and solution after precipitating.