RECOVERING/PURIFYING METHOD FOR LITHIUM SALT SOLUTION AND METHOD OF MANUFACTURING LITHIUM ZEOLITE USING THE SAME

PROBLEM TO BE SOLVED: To provide a recovering/purifying method of a lithium salt solution, which is capable of inexpensively and easily recovering and purifying a contaminated lithium salt solution produced at the time of manufacturing lithium zeolite, and a method of manufacturing lithium zeolite using the same. SOLUTION: In the method of preparing lithium zeolite from zeolite formed by associating metallic cation except lithium by ion exchange, the lithium zeolite is obtained by bringing the zeolite into contact with an ammonium salt solution to substitute NH4+ ion for all metallic cation and bringing the zeolite into contact with the lithium salt solution to substitute Li ion for a part or the whole of NH4+ ion, a waste liquid of the lithium salt solution brought into contact with the zeolite is recovered and the lithium salt solution is purified by adding a basic Li source in the quantity equivalent to NH4+ contained in the recovered waste liquid and heating to remove NH4+ in the waste liquid.