It is also a kind of inorganic metal tungsten compound. Ammonium paratungstate and ammonium metatungstate have certain differences in performance, production process and application. One is that the former is difficult to dissolve in water, the latter is easily soluble in water, and the aqueous solution is quite stable; the other is that the former is the main raw material for the production of the latter; the third is that the former is mainly used to produce tungsten products, while the latter can be used to produce tungsten Products can also be used as nuclear shielding materials, corrosion inhibitors, petroleum catalysts, etc. The following mainly introduces the basic information of the former.
Ammonium paratungstate is a white crystalline powder, the English name is Ammonium Paratungstate (abbreviated as APT), the molecular formula is (NH4)10W12O41·5H2O, and there are two kinds of shapes: flake and needle. Its relative density is 2.3g/cm³, and its solubility in water at 20°C is less than 2%. React with hydrogen peroxide to form soluble peroxytungstate.
It is worth noting that APT is easy to dehydrate and decompose in a heated environment. Under normal conditions, the thermal decomposition process is divided into four stages: removal of crystal water, decomposition into amorphous ammonia tungsten bronze, transformation into ammonia tungsten bronze and decomposition into tungsten trioxide. Experiments have shown that when heated in the air, APT begins to remove part of the ammonia molecules when the temperature is lower than 100°C, and removes all the ammonia molecules and crystal water when it is heated strongly, and then turns into yellow tungsten oxide powder.
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