Heat the saturated aqueous solution of tungstate such as sodium tungstate Na2WO4, calcium tungstate CaWO4, etc., and slowly add the solution dropwise into boiling concentrated hydrochloric acid with a molar ratio of 2 to 3 times. Yellow tungstic acid was precipitated according to the above reaction. At this time, if the dropping speed is too fast or the liquid temperature drops, it is easy to form suspended or colloidal precipitates, which will bring difficulties to the next step. Continue heating on the water bath for 1 hour after the dropwise addition, so that the precipitate becomes easy to filter, and after standing still, wash it several times with 5% ammonium nitrate aqueous solution to completely remove Cl-. After filtration, it was dried at 120°C.
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