The chemical properties of ammonium metatungstate (AMT) and ammonium paratungstate (APT) can be summarized as follows:
Ammonium metatungstate (AMT)
Molecular formula: HN₆OW (the specific molecular formula may vary slightly due to preparation conditions)
Color and form: white crystalline powder or slightly yellow.
Solubility: ammonium metatungstate is soluble in water, while ammonium paratungstate is slightly soluble in water, which is a clear difference between the two.
Use: used to make metal tungsten, alloy steel, fireproof fabrics, etc., and used in the ceramic industry. At the same time, it is also used to make various petrochemical catalysts and other tungsten compounds, and is the main raw material for tungsten-based catalysts in refineries.
Safety information: marked as a hazardous substance with a specific hazard category code and safety instructions.
Ammonium paratungstate (APT)
Molecular formula: (NH₄)WO·5H₂O (this is one of the possible molecular formulas, which may vary slightly due to preparation conditions)
Color and form: white crystals, with two forms: flake or needle.
Solubility: Slightly soluble in water, less than 2% solubility in water at 20°C, insoluble in alcohol.
Chemical stability: Decomposes in acid and alkali solutions, reacts with hydrogen peroxide to form soluble peroxytungstate.
Uses: Used to make tungsten trioxide or blue tungsten oxide to make metal tungsten powder, and also used to make ammonium metatungstate and other tungsten compounds, used as additives in the petrochemical industry.
Thermal stability: When heated in air, it begins to remove some ammonia molecules below 100°C, and removes all ammonia molecules and crystal water when strongly heated, turning into yellow tungsten trioxide powder.
The main difference between ammonium metatungstate and ammonium paratungstate in chemical properties is solubility and thermal stability. Ammonium metatungstate is easily soluble in water, while ammonium paratungstate is slightly soluble in water. In addition, ammonium paratungstate gradually loses ammonia and crystal water when heated, and finally turns into tungsten trioxide. These chemical properties determine their different uses and preparation methods in industrial applications.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
Please contact CHINATUNGSTEN for inquiry and order of ammonium metatungstate:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
