磺基水杨酸作萃取剂铜、镧、铈的萃取分离研究

Study on the extraction separation of copper,lanthanum and cerium with sulfosalicylic acid as the extractant

目的:利用磺基水杨酸作萃取剂,在吐温80-硫酸铵固-液体系中,萃取分离Cu(Ⅱ)、La(Ⅲ)、Ce(Ⅳ)金属离子。方法:研究了萃取相(固相)中磺基水杨酸及金属离子络合物吸收光谱;不同酸度、不同盐用量、不同萃取剂用量、不同类型表面活性剂对Cu(Ⅱ)、La(Ⅲ)、Ce(Ⅳ)离子萃取率的影响。结果:与磺基水杨酸光谱比较,Cu(Ⅱ)、Ce(Ⅳ)离子吸光度增大,最大吸收波长红移;La(Ⅲ)离子几乎未变。在pH2.0的酸度下,实现了Cu(Ⅱ)与La(Ⅲ)之间的萃取分离。结论:方法具有简便、快速、易于操作的优点,用于金属离子的萃取分离效果较好。

Objective：In a Tween80-（NH4）2SO4 liquid-solid extraction system,extraction separation of Cu（Ⅱ）,La（Ⅲ）and Ce（Ⅳ）metal ions with Sulfosalicylic acid as the extractant were investigated.Methods： Based on study of absorption spectrum of sulfosalicylic acid and metal ionic compounds in solid extraction system,the extraction efficiencies of Cu（Ⅱ）,La（Ⅲ）and Ce（Ⅳ）metal ions were discussed under different acidities,salt dosages,quantities of extractant and types of surfactants.Results： Compared to Sulfosalicylic acid spectra,the maximum wavelength of Cu（Ⅱ）and Ce（Ⅳ）shifted to the red,while that of La（Ⅲ）did not.The extraction separation of Cu（Ⅱ）and La（Ⅲ）was carried out by controlling the solution acidity（pH2.0）.Conclusion： The method is rapid,simple and easy to operate.It has been applied to the extraction separation of metal ions with satisfactory results.