Ammonium metatungstate is an important tungsten product. The basic information about ammonium metatungstate is summarized as follows:
What is the definition of ammonium metatungstate?
Ammonium metatungstate is an inorganic compound with the chemical formula (NH₄)₆H₂W₁₂O₄₀·xH₂O (where x is the number of water molecules), also known as AMT. It is composed of four chemical elements: tungsten, nitrogen, hydrogen, and oxygen, and usually appears as a white crystalline powder or slightly yellow crystals.
What are the physical properties of ammonium metatungstate?
The melting point of ammonium metatungstate is above 300℃, and the relative density is about 2.3g/cm³.
It is soluble in water but insoluble in ethanol.
It exists stably at room temperature and pressure, but is easily decomposed into WO3 when heated.
What are the chemical properties of ammonium metatungstate?
Compared with ammonium paratungstate (APT), ammonium metatungstate is more soluble in water.
Ammonium metatungstate is irritating and toxic, so special attention should be paid to prevent contact with eyes and skin during production and use.
What are the uses of ammonium metatungstate?
Ammonium metatungstate is an important raw material for the production of tungsten oxide (WO3-X).
It can be used to make tungsten compounds such as tungsten oxide and ammonium phosphotungstate.
In petrochemicals, ammonium metatungstate is the main raw material for tungsten-based catalysts in refineries, with high catalytic activity, good selectivity, excellent water solubility and long service life.
It can also be used as a colorant for ceramics and other industrial uses.
What are the production methods of ammonium metatungstate?
There are various methods for preparing ammonium metatungstate, including thermal degradation, liquid-liquid extraction, ion exchange, electrodialysis, neutralization, acidolysis and alcohol precipitation.
Among them, thermal degradation refers to the process of heating and decomposing ammonium paratungstate (APT) and evaporating and crystallizing to obtain ammonium metatungstate.
What is the basic safety information of ammonium metatungstate?
Ammonium metatungstate is irritating and toxic, and safety protection should be paid attention to during production and use.
In summary, ammonium metatungstate is an important tungsten product, which occupies an important position in the chemical, petroleum, ceramic and other industries due to its unique physical and chemical properties and wide application fields.
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