用M5640从锌氨溶液中萃取锌

Extraction of Zinc from Zinc Ammonia Solution by M5640

以M5640为萃取剂,在CO2协同作用下,从氨-硫酸铵溶液中萃取锌,考察了萃取剂浓度、总氨浓度、相比、温度、加入CO2等因素对锌萃取率的影响.结果表明,M5640在氨性溶液中对锌有一定的萃取能力,溶液pH值和总氨浓度对锌的萃取率影响较大,向溶液中加入CO2可明显提高M5640对锌离子的萃取能力.在温度25℃及M5640加入量35vol%、相比O/A=2、锌离子浓度18.02 g/L、总氨浓度3 mol/L的条件下,加入CO2锌的单级萃取率由不加CO2时的65.1%提升至97%以上,两级错流萃取锌萃取率达99.9%.萃取得到的有机相不含氨,表明加入CO2可避免氨的共萃.

Zinc was extracted from ammonia-ammonium sulfate solution using M5640 as an extractant. By the synergistic effect of CO2, the effects of extractant concentration, total ammonia concentration, phase ratio, temperature and addttion CO2 on the extraction rate of zinc were examined. The results showed that M5640 had a certain extraction ability to zinc from ammonia solution, and the pH value of solution and total ammonia concentration had obvious influence on the extraction rate of zinc. In the extraction process, add CO2 into solution can obviously improve the extraction efficiency of zinc. Under the conditions of temperature 25 ℃, M5640 concentration 35 vol% O/A phase ratio of 2, zinc concentration 18.02 g/L, the total ammonia concentration in the solution 3 mol/L, with addition of CO2, zinc extraction rate increased from 65.1%（without CO2） to above 97%, by two stage cross-current extraction, zinc extraction rate reached 99.9%. The organic phase without ammonia, the results indicated that addition of CO2 can avoid co-extraction ammonia.