锆渣洗水中Sc与P的萃取分离工艺及其机理研究

Study on Process and Mechanism of Extraction Separation of Sc and P in Zirconium Residue Wash Water

研究了三种不同萃取体系(P350、P507、P204)对P和Sc的萃取特性及萃取机理,通过对比确定P204-TBP-煤油体系是分离Sc与P的最佳萃取体系,理想的有机相组成为25%P204+4%TBP+71%煤油,料液酸度选5.4mol/L为宜,此时Sc萃取率为98.78%,P萃取率为20.99%。P204体系适用的料液酸度范围以及P含量范围广,得到的回收产品可直接进入高纯氧化钪生产线作为原料使用,且该法工艺简单、经济,回收率高,具有推广应用价值。

The extraction properties and mechanism of three different extraction systems （P350, P507 and P20：l） for P and Sc were studied. Based on comparison, P204-TBP-kerosene system is the best extraction system for separation of Sc and Pb. The ideal organic phase composition is 25% P204＋4% TBP＋ 71% kerosene, and the suitable feed liquid acidity is 5.4 mol/L. Under the above conditions, Sc extraction rate is 98.78% and P extraction rate is 20.99%. P204 extraction system is suitable for a wide range of feed liquid acidity and P content,and the recovered products can be used directly as a raw material into a high-purity scandium oxide production line. This method has simple and economical process and high recovery rate with the value of popularization and application.