Ammonium metatungstate (AMT) hydrate is an important chemical substance, and the following is all the relevant data about it.
- Basic information of Ammonium metatungstate (AMT) hydrate
Chinese name: Ammonium metatungstate hydrate
English name: Ammonium metatungstate hydrate
CAS No：12333-11-8
Molecular formula: (NH4)6H2W12O40 – xH2O (Note: x represents the number of water molecules, which may vary according to specific products)
Molecular weight: according to different sources, there may be slight differences, generally between 2956.30 and 2974.32
- Physical properties of ammonium metatungstate hydrate
Appearance color of ammonium metatungstate hydrate
White crystal
Melting point of ammonium metatungstate hydrate
100ºC (dec.)(lit.)
Density of ammonium metatungstate hydrate
The exact value is not provided, but can be estimated from its molecular weight and structure.
Solubility of ammonium metatungstate hydrate
Highly soluble in water, solubility can be adjusted by changing the pH of the solution.
III. Chemical properties of ammonium metatungstate hydrate
Thermal stability of ammonium metatungstate hydrate
Ammonium metatungstate hydrate has high thermal stability, can withstand high temperature without decomposition, suitable for high temperature applications.
Chemical stability of ammonium metatungstate hydrate
The thermal stability of Ammonium Metatungstate Hydrate is high, resistant to oxidation and other chemical reactions, and suitable for long-term storage and use.
Reducibility of Ammonium Metatungstate Hydrate
Ammonium metatungstate is an effective reducing agent, which can reduce tungsten oxide to tungsten metal.
- Application of thermal stability of ammonium metatungstate hydrate
Production of tungsten-based alloys and coatings
Ammonium metatungstate is used as a precursor for the production of tungsten-based materials for the production of alloys and coatings with high-temperature stability and wear resistance.
Synthesis of high purity tungsten products
As a reducing agent, it is used to reduce tungsten oxide to tungsten metal to produce high-purity tungsten products such as tungsten wires, tubes and rods.
Production of tungsten-based catalysts
These catalysts are highly active, selective and stable and are used in a range of chemical reactions.
Scientific research and development
As a starting material for synthesizing other tungsten compounds, it is used for research and development of new tungsten-based materials.
- Preparation method of ammonium metatungstate hydrate
There are various methods for the preparation of ammonium metatungstate hydrate, such as ion exchange method, neutralization method, thermal degradation method, liquid-liquid extraction method, electrodialysis method and acidolysis alcoholysis method. In recent years, researchers have proposed a new preparation method – neutralization and nanofiltration coupling process, which prepares AMT mixed solution by acid neutralization, and then concentrates and washes it through a nanofiltration membrane device to obtain high purity ammonium metatungstate solution.
- Safety information of ammonium metatungstate hydrate
Hazard symbols of ammonium metatungstate hydrate
May contain GHS05 (oxidizing substance), GHS07 (flammable), etc. (specific according to product MSDS)
Signal word for ammonium metatungstate hydrate
Danger (according to product MSDS)
Please note that the above data and information may vary depending on the specific product, manufacturer and test conditions. When using Ammonium Metatungstate Hydrate, please always refer to the product instruction and safety data sheet (MSDS) to ensure safe use and proper handling.
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