Ammonium metatungstate hydrate is a chemical substance with the following detailed information and characteristics:
- Basic information:
o CAS No.: 12333-11-8
o Molecular Formula: (NH4)6H2W12O40-xH2O
o Appearance: white crystalline powder or slightly yellowish
o Properties: soluble in water, and present weak acidity
- Uses:
o Ammonium metatungstate hydrate has important applications in a number of fields, including use in the manufacture of tungsten metal, alloy steel, fireproof fabrics, etc., and is widely used in the ceramic industry.
o It is also the main raw material for tungsten-based catalysts in oil refineries and is used in the manufacture of various petrochemical catalysts and other tungsten compounds.
o Ammonium metatungstate is also used as raw material for catalysts, capacitors, nuclear shielding, flame retardants, corrosion inhibitors, and excellent raw material for making ultrafine tungsten powder, high specific gravity alloy tungsten powder, phosphotungstic acid, arsenotungstic acid, and silicotungstic acid.
- Production process:
o The production process of ammonium metatungstate hydrate includes a variety of methods, such as solvent extraction method, ion exchange method, neutralization method, tungstic acid method and thermal decomposition method. The core of these methods lies in the conversion of ammonium tungstate or sodium tungstate to ammonium metatungstate by controlling the reaction conditions, such as pH, temperature, stirring speed, etc.
- Health and environmental impacts:
o Ammonium metatungstate hydrate poses certain health hazards, such as it may be harmful to health if swallowed, may be detrimental to health in contact with the skin, and may cause serious visual impairment.
o It is also harmful to aquatic organisms, so special attention to environmental protection is needed when using and storing it.
- Storage and transportation:
o Ammonium metatungstate hydrate should be stored in a dry, cool, ventilated place, avoiding direct sunlight and humid environment.
o During transportation, tightly sealed containers should be used and avoid violent vibration, impact or fall.
- Safety information:
o Ammonium metatungstate hydrate is classified as hazardous material and relevant safety operation procedures and regulatory requirements should be observed.
o Appropriate protective equipment, such as protective gloves, protective clothing, eye protection equipment and protective masks, should be worn during handling and use.
To sum up, ammonium metatungstate hydrate is an important chemical substance with wide application in many fields, but it needs to pay special attention to its health and environmental impacts and comply with relevant safety regulations in the process of use, storage and transportation.
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