用P507从硫酸体系中萃取分离镓与铁锌离子

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

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%(?)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%.

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%（？） 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 2℃ 0 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.