离子交换法净化氯化钪溶液

Purifying Scandium Chloride Solution by Ion Exchange

在不同p H值、时间及络合剂EDTA影响下,研究了阳离子交换树脂对氯化钪溶液的深度净化效果.实验结果表明:在p H=2、接触时间3h左右时树脂对Sc3+,Al3+,Fe3+的吸附情况较好,对Zr4+,Si4+,Ti4+吸附性能差,能直接实现Sc3+与Zr4+,Si4+,Ti4+的分离;添加抗坏血酸将溶液中Fe3+还原成Fe2+并添加络合剂EDTA络合Sc3+后,树脂吸附Fe2+与Al3+而不吸附Sc3+.经两段离子交换法,氯化钪溶液中Fe,Ti,Al,Ca,Zr,Si的去除率分别达到93.3%,100%,99.80%,98.22%,99.63%,100%.

The effect of the strong acid styrene type cation exchange resin on deep purification of scandium chloride solution was studied under the different p H value, contact time and the complexant of EDTA. The results showed that when the p H value is 2 and contact time is 3 hours,the resin has great advantage on adsorbing Sc^3 ＋,Al^3 ＋and Fe^3 ＋,whereas the adsorption performance of Zr^4 ＋,Si^4 ＋and Ti^4 ＋is poor. Therefore,the separation between Sc^3 ＋and Zr^4 ＋,Si^4 ＋,Ti^4 ＋can be achieved. Adding the complexant of EDTA to complex Sc^3 ＋and the ascorbic acid to reduce Fe^3 ＋to Fe^2 ＋,Fe^2 ＋and Al^3 ＋instead of Sc^3 ＋can be absorbed on resin. Through the two-stepped ion exchange process,the removal rate of Fe,Ti,Al,Ca,Zr,Si in scandium chloride solution can be 93. 3%,100%,99. 80%,98. 22%,99. 63% and 100%,respectively.