METHOD OF MANUFACTURING AMMONIUM TUNGSTATE AQUEOUS SOLUTION

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing an ammonium tungstate aqueous solution in high concentration with high recovery rate without depositing ammonium tungstate in the method of manufacturing the ammonium tungstate aqueous solution from a sodium tungstate aqueous solution using a CL type strong basic anion exchange resin. SOLUTION: The method of manufacturing the ammonium tungstate aqueous solution from the sodium tungstate aqueous solution is carried out by passing the sodium tungstate aqueous solution through the CL type strong basic anion exchange resin to form a tungstic acid type strong basic anion exchange resin on which tungstic ion is adsorbed and bringing an ammonium chloride and ammonia-containing aqueous solution into contact with the tungstic acid type strong basic anion exchange resin to elute the ammonium tungstate aqueous solution. COPYRIGHT: (C)2008,JPO&INPIT