Comparative study for solvent extraction of Sc(III) using two phosphoric acidic reagents such as di-(2-ethyhexyl) phosphoric acid and 2,4,4,tri-methyl,pentyl-phosphinic acid was investigated. Slope analysis method suggests a cation exchange reaction of Sc(III) with both extractants at a molar ratio of extractant: Sc(III) = 2.5:1 at equilibrium pH < 1.5. The plot of log D vs. log [Extractant] yield the slope (n) value as low as n = 1.2–1.3 and as high as n = 7 at low and high extrcatant concentration level, respectively. Extraction isotherm study predicted the need of 2 stages at A: O = 1:4 and A: O = 1:3 using 0.1 M D2EHPA and 0.1 M Cyanex 272, respectively. Stripping of Sc(III) was carried out at varied NaOH concentration to ascertain the optimum stripping condition for effective enrichment of metal. The predicted stripping condition (2)-stages with A: O = 1:3 and 1:4 for D2EHPA and Cyanex 272, respectively) obtained from Mc-Cabe Thiele plot was further validated by 6-cycles CCS study. An actual leach solution of Mg-Sc alloy bearing 1.0 g/L of Sc(III), 2.5 g/L of Mg and 0.2 M HCl was subjected for selective separation of Sc at the optimum condition. The counter current simulation (CCS) study for both extraction and stripping of actual solution resulted quantitative separation of Sc with ∼12 fold enrichment. The organic phase before and after loading of Sc(III) along with the diluents was characterized by FTIR to ascertain the phase transportation of Sc(III).

研究了使用两种磷酸试剂如二-（2-乙基己基）磷酸和2,4,4，三甲基，戊基次膦酸对Sc（III）进行溶剂萃取的比较研究。斜率分析法表明，在平衡pH <1.5时，Sc（III）与两种萃取剂的阳离子交换反应在萃取剂：Sc（III）= 2.5：1的摩尔比下进行。log D与log [Extractant]的关系图得出，在低和高萃取剂浓度水平下，斜率（n）值分别低至n = 1.2–1.3和高n = 7。等温萃取研究预测分别需要使用0.1 M D2EHPA和0.1 M Cyanex 272在A：O = 1：4和A：O = 1：3进行两个阶段的萃取。Sc（III）的汽提是在各种NaOH浓度下进行的，以确定有效富集金属的最佳汽提条件。通过6周期CCS研究进一步验证了从Mc-Cabe Thiele图获得的D2EHPA和Cyanex 272的A：O = 1：3和1：4的预计剥离条件（2）阶段。含有1.0 g / L Sc（III），2.5 g / L Mg和0.2 M HCl的Mg-Sc合金的实际浸出溶液用于在最佳条件下选择性分离Sc。对实际溶液进行萃取和汽提的逆流模拟（CCS）研究导致了Sc的定量分离，其富集程度约为12倍。FTIR表征了Sc（III）与稀释剂一起加载前后的有机相，以确定Sc（III）的相迁移。含有1.0 g / L Sc（III），2.5 g / L Mg和0.2 M HCl的Mg-Sc合金的实际浸出溶液用于在最佳条件下选择性分离Sc。对实际溶液进行萃取和汽提的逆流模拟（CCS）研究导致了Sc的定量分离，其富集程度约为12倍。FTIR表征了Sc（III）与稀释剂一起加载前后的有机相，以确定Sc（III）的相迁移。含有1.0 g / L Sc（III），2.5 g / L Mg和0.2 M HCl的Mg-Sc合金的实际浸出溶液用于在最佳条件下选择性分离Sc。对实际溶液进行萃取和汽提的逆流模拟（CCS）研究导致了Sc的定量分离，其富集程度约为12倍。FTIR表征了Sc（III）与稀释剂一起加载前后的有机相，以确定Sc（III）的相迁移。