Metatungstate refers to the generation of polymerized metatungstic acid in the solution when the acid is acidified by tungstate solution, also known as polytungstic acid. Metatungstate is mostly soluble in water, stable in weak acid solution (pH=4), and will decompose when adding alkali and boiling to form orthotungstate. It is an important compound in the production process of tungsten. Metatungstic acid and its salts have high solubility in water. Metatungstate ions are stable in weakly acidic solutions (pH=4), and it is difficult to completely precipitate them with precipitants such as Ca2+, H+, etc. Therefore, when tungsten is required to be precipitated in tungsten metallurgical production, care should be taken to avoid the formation of metatungstate in the solution. In order to decompose metatungstate, it is generally converted into monotungstate by adding alkali and boiling for a long time in production.
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