The tungstic acid method dissolves tungstic acid in ammonia water and adds it to boiled deionized water. Heat each ammonia with stirring to make Ph=8. Add acetic acid while the solution boils, and then adjust the Ph value to 2-4 with dilute nitric acid. Continue heating and concentration until the relative density is 1.5-2. Stop heating, cool and filter. The filtrate is thoroughly stirred with ethanol, settled and filtered, and the crystals are dried and crushed at 80 ℃ to obtain the product.
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