It is a light yellow powder with a ratio of WO3 and H2O of 1:1, the chemical formula is H2WO4, the molecular weight is 249.86, the density is about 5.5g/cm3, the melting point is about 100°C, and the boiling point is about 1473°C. It is soluble in hydrofluoric acid and alkali The solution will gradually gel after dipping, and can exist stably at normal temperature and pressure, but it is easy to dehydrate and generate tungstic anhydride (WO3) when heated to 100°C.
Production method 1: acidify sodium tungstate solution with sulfuric acid or hydrochloric acid to form sodium polytungstate solution, and then add excess hot concentrated hydrochloric acid to produce the desired product.
Production method 2: first react sodium tungstate solution and calcium chloride solution to form calcium tungstate precipitate, then add hot concentrated hydrochloric acid to the calcium tungstate precipitate to produce the desired product.
Production method three: first use hydrochloric acid to adjust the pH value of the sodium tungstate solution after impurity removal treatment, and then fuse with the extractant (composed of acidified isooctyl alcohol and sulfonated kerosene) for extraction, and then mix the negative tungsten organic phase with The stripping agent (composed of hydrogen peroxide and citric acid) is fused and stripped, and the stripped solution is heated, cooled, and filtered.
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