用微乳液从废催化剂浸出液中分离铝

Separation of Al^3+ From Spent Catalyst Leaching Solution Using Microemulsion

研究了用皂化P507从废催化剂浸出液中萃取铝,再经硫酸反萃取、蒸发结晶制备水合硫酸铝,考察了萃取、反萃取过程中几种主要因素对Al3+回收的影响。结果表明:以皂化率45%的25%P507+10%正戊醇+65%260#溶剂油为萃取剂,在料液中Al3+、Mg2+、Ni2+质量浓度分别为2 g/L、50 mg/L和10 mg/L,料液pH=1.5,萃取相比(Vo/Va)=1/1,萃取时间3 min条件下,Al3+、Mg2+、Ni2+萃取率分别为99.35%、2.83%、0.56%;负载铝的有机相用硫酸反萃取,在硫酸溶液浓度3 mol/L、反萃取相比(Va/Vo)=1/1条件下,Al3+反萃取率为95.13%;该反萃取液以蒸发结晶法制备水合硫酸铝,其质量符合HG/T 2225—2010标准Ⅰ类产品要求。

The hydrated aluminum sulfate was prepared by solvent extraction of Al3+from leaching solution of spent catalyst using saponified P507 and stripping Al3+from loading organic phase using H2SO4 solution and evaporation crystallization.The effect of several main factors on the recovery of Al3+during extraction and stripping were examined.The results show that using 25%P507+10%n-pentanol+65%260#solvent oil system of which saponification rate is 45%as extractant,under the conditions of Al3+、Mg2+、Ni2+concentration of 2 g/L、50 mg/L and 10 mg/L,respectively,feed liquid pH of 1.5,phase ratio(Vo/Va)of 1/1,extraction time of 3 min,the extraction rates of Al3+、Mg2+and Ni2+are 99.35%、2.83%and 0.56%,respectively;Al3+is stripped using H2SO4 solution under the conditions of H2SO4concentration of 3.0 mol/L,phase ratio(Va/Vo)of 1/1,the Al3+stripping rate is 95.13%.The stripping solution is vaporized to crystallize aluminum sulfate hydrate which meets the quality requirements of classⅠproducts of HG/T 2225—2010.