Abstract: The effect of the strong acid styrene type cation exchange resin on deep purification of scandium chloride solution was studied under the different pH value， contact time and the complexant of EDTA. The results showed that when the pH value is 2 and contact time is 3 hours， the resin has great advantage on adsorbing Sc³⁺， Al³⁺ and Fe³⁺， whereas the adsorption performance of Zr⁴⁺， Si⁴⁺ and Ti⁴⁺ is poor. Therefore， the separation between Sc³⁺ and Zr⁴⁺，Si⁴⁺，Ti⁴⁺ can be achieved. Adding the complexant of EDTA to complex Sc³⁺ and the ascorbic acid to reduce Fe³⁺ to Fe²⁺， Fe²⁺ and Al³⁺ instead of Sc³⁺ 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.

Key words: scandium, purification, ion exchange, complexant, cation exchange resin