Tungstic acid precipitation method
In industry, hydrochloric acid is usually used to precipitate tungstic acid from sodium tungstate solution:
Na2WO4 + 2HC1 = H2WO4¯ + 2NaC1
Calcium Tungstate Precipitation and Its Acid Decomposition Method
Pour the CaCl2 solution into the sodium tungstate solution to form CaWO4 as a white precipitate (artificial scheelite). The precipitated CaWO4 is decomposed with hot hydrochloric acid to obtain a yellow tungstic acid precipitate with larger particles.
Na2WO4 + CaCl2 = CaWO4¯ + 2NaC1
CaWO4 + 2HC1 = H2WO4¯ + CaC12
Tungstic acid extraction method
The process of converting the pure sodium tungstate solution after purification and removal of impurities into ammonium tungstate solution with amine extractants such as tertiary amines (ie trialkylamine, N235), and then separating ammonium paratungstate from the ammonium tungstate solution.
Ammonium-sodium double salt method of tungstic acid
Combine the purified and desiliconized sodium tungstate solution with NH4Cl to form insoluble ammonium paratungstate-sodium double salt crystal precipitation.
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