Sodium Tungstate Tihydrate

Sodium tungstate dihydrate is a colorless orthorhombic plate crystal. Its physical properties are as follows: chemical formula: H4Na2O6W, molecular weight: 329.8477, melting point: 698 ℃, relative density: 3.25 Solubility: soluble in water, was slightly alkaline, slightly soluble in ammonia, insoluble in ethanol. Its chemical properties are as follows: H4Na2O6W stable in air, but heated to 100 ℃ loss crystal water into anhydrous substance, when contact with strong acid will decompose into water-insoluble acid, and in dry air will be weathered.
Sodium tungstate dihydrate is mainly used in manufacture metal tungsten, tungsten acid, tungstate, dyes, inks and catalysts.
Synthesis sodium tungstate dihydrate processes are as follows:
1. The tungsten ores by alkaline hydrolysis to crush the wolframite within 320 mesh, adding together with the 30% caustic soda to reactor to operate alkaline hydrolysis.
2. After alkaline hydrolysis, the mixture reacts with calcium chloride. Calcium tungstate and calcium tungstate react to obtain tungstic acid.
3. tungstic acid reaction with caustic soda to produce sodium tungstate and after evaporation and crystallization, centrifugal dewatering, drying to obtain sodium tungstate dihydrate.

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