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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%.
The extraction and separation of Ga3 +, Fe2 + and Zn2 + in sulfuric acid system were carried out by using P507 extractant. The influence of acidity, extractant concentration, time and temperature on the extraction was investigated and the extraction isotherm was drawn. By comparing the three kinds of ions The effect of stripping with different concentrations of HCl and H2SO4 and their regularities were studied. The separation scheme of stripping Ga3 + with H2SO4 was proposed after the elution of Fe2 + and Zn2 + with HCl, and the stripping isotherm was plotted. The results showed that 40% (?) P507 + The sulfonated kerosene is the organic phase, the extraction rate of Ga3 + reaches 98.48% at the condition of O / A = 1: 1, temperature 25 ℃ and time 20 min, and the extraction rate of Ga3 + reaches 98.48%, while that of 19.56% and 38.42% Of Zn2 + into the organic phase.The organic phase was washed with 6 mol / L HCl 3 times to completely elute Fe2 + and Zn2 + without loss of Ga3 +, the loaded organic phase except Fe2 + and Zn2 + was treated with 100 g / A = 4: 1,25 ℃, 10 min, after 4 countercurrent stripping, Ga3 + stripping rate of 97.64%.