用P507从硫酸体系中萃取分离镓与铁锌离子

采用P507萃取剂对硫酸体系中的Ga3+与Fe2+, Zn2+进行萃取分离，考察了料液酸度、萃取剂浓度、时间、温度对萃取的影响，绘制萃取等温线；通过比较负载有机相中3种离子用不同浓度HCl和H2SO4反萃的效果及规律，提出用HCl洗脱Fe2+和Zn2+后，再用H2SO4反萃Ga3+的分离方案，并绘制反萃等温线. 结果表明，以40%(j) P507+磺化煤油为有机相，在相比O/A=1:1、温度25℃、时间20 min条件下，经过4级逆流萃取，Ga3+萃取率可达98.48%，同时19.56%的Fe2+和38.42%的Zn2+共萃进入有机相. 负载有机相用6 mol/L HCl洗涤3次可完全洗脱Fe2+和Zn2+而不损失Ga3+，除Fe2+和Zn2+后的负载有机相用100 g/L H2SO4按O/A=4:1、25℃、10 min，经过4级逆流反萃，Ga3+反萃率达97.64%.

Extraction and Separation of Gallium Ion with Iron and Zinc Ions in Sulfuric Acid System with P507

Separation of Ga3+ with Fe2+ and Zn2+ in sulfuric acid system by P507 was studied. The effects of feed acidity, extractant concentration, time, phase ratio and temperature on the extraction of Ga3+ were examined. The isotherms of the extraction were plotted, and the separation scheme of washing Fe2+and Zn2+ by HCl and stripping Ga3+ by H2SO4 was designed by comparing the performances of three ions stripped by HCl and H2SO4 at different concentrations. The results show that with 40%(j) P507 in sulphonated kerosene as extractant, the extraction rate of Ga3+ reaches 98.48% in four-stage counter-current extraction under O/A ratio of 1:1 at 25℃ for 20 min, meanwhile, 19.56% Fe2+ and 38.42% Zn2+ are coextracted. Fe2+, Zn2+ in loaded organic can be totally washed by 6 mol/L HCl in 3 times. Ga3+ in loaded organic can be stripped using 100 g/L H2SO4 and the stripping rate reaches 97.64% in four-stage counter-current stripping under O/A ratio of 4:1 at 25℃ for 10 min.