Abstract: In this paper several functional materials, such as Li2Mg2Si4O10F2 (LHT), H2Mn8O16•1.4H2O (CRYMO) and Li1.3Ti1.7Al0.3(PO4)3 (LTAP), were investigated in order to separate respectively iron, potassium and sodium impurities from the aqueous solution of high-concentration lithium chloride. The experimental results show that these functional materials have very high ion exchange selectivity to Fe3＋, K＋ and Na＋, respectively. And these functional materials are effective for the separation of impurities from high-concentration lithium chloride solution. The ion exchange behavior of these functional materials with impurities in high-concentration lithium chloride solution was analyzed and discussed. It is shown that the ion exchange kinetics of the Li2Mg2Si4O10F2, H2Mn8O16•1.4H2O and Li1.3Ti1.7Al0.3(PO4)3 with Fe3＋, K＋ and Na＋ respectively in high-concentration lithium chloride solution can be represented approximately by the equation of JMAK.

Key words: Lithium chloride, Impurity, Functional materials, Ion exchange