Ammonium Tungstate
Ammonium tungstate is one of tungsten compounds, chemical formula is (NH4)10W12O41~xH2O . It is an important intermediate material for tungsten metallurgy industry. Its appearance is white rhombic crystal, soluble in water, insoluble in alcohol, lose four molecular of crystal water under 400℃.
In tungsten metallurgy industry, ammonium tungstate producing methods is mainly by alkali decomposition of tungsten concentrate, reacting with calcium chloride to synthesize calcium tungstate, by acidity decomposition of calcium tungstate and reacting with ammonia solution, ammonium tungstate is obtained.
Ammonium tungstate can be produced by neutralization process from ammonia and tungstic acid, chemical equation is:
12H2WO4+10NH4OH→5(NH4)2O·12WO3·5H2O+12H2O
Ammonium tungstate is an important raw material for producing ammonium paratungstate, ammonium metatungstate, phosphorus tungstate, also can be used for producing tungsten products and catalyst.
Storage of ammonium tungstate should be in cool and dry place with complete packing to avoid get in touch with alkali products.
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