The Preparation of High-purity Ammonium Tungstate by Tungsten Oxide

Provides a process for preparing high purity ammonium tungstate method, include using tungsten oxide, ammonium metatungstate, ammonium paratungstate, multi-ammonium tungstate and so on, adding pure water and ammonia (or aqueous ammonia) at normal temperature for ammonioalkyl stirred mix. After extraction impurity, under atmospheric pressure,adding superacid acid precipitation crystallization, solid-liquid separation after the end of the acid precipitation will the ammonium tungstate embodiment separated after drying of the product of. Tungstate ion concentration in the bulk solution was maintained at 7.5 to 11.0 in the 50 ~ 250g / L, solution PH control during ammonia dissolved ingredients during acid precipitation, acid precipitation endpoint pH should be controlled at 4.0 to 7.0. With the present invention can be greatly improved so that the purity of the product of ammonium tungstate over ammonium tungstate national standard zero-level category, meet the electronics industry, of the indicator of the catalyst industry can be used for the production purity of 4N (99.99%) of high purity tungsten powder and tungsten metal products.

This preparation method is easy to operate among present invention and the obtained ammonium tungstate product quality stability and crystallization rate can reach more than 96%.

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