Preparation Method for High-purity Ammonium Paratungstate

A high-purity preparation of ammonium paratungstate, characterized in that the preparation of raw materials, including an ion-exchange method or the extraction of the total content of the impurities produced in the total content of impurities to achieve ≤177.5ppm GB 0 APT or production process of ≥ 177.5ppm defective APT, the method comprising the steps of: preparing a raw material was calcined to produce a tungsten oxide; the production of ammonia dissolved tungsten trioxide, ammonium tungstate to form a solution; solution of ammonium tungstate was evaporated generated crystallization of ammonium paratungstate to obtain a wet crystal; paratungstate, and the wet crystals were dried and sieved to obtain a total content of impurities of high-purity ammonium paratungstate ≤65ppm.

The present invention optimizes the production process of high purity APT, improve product quality, reduce production costs of high purity APT products.




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