Technical grade ammonium metatungstate is an important inorganic compound, mainly composed of four elements: tungsten, nitrogen, hydrogen and oxygen, with unique physical and chemical properties. The following is a detailed introduction of it:
- Basic Information
Name
Ammonium metatungstate, also often called Ammonium (META) tungsten hydrate, is known as Ammonium Metatungstate Hydrate, or AMT for short.
Molecular formula
Commonly expressed as (NH4)6(H2W12O40)-nH2O, where n denotes the amount of water of crystallization, which may vary depending on the production process and conditions. It is also documented to have a molecular formula of H28N6O41W12, which may be due to the different ways in which the water of crystallization portion of the molecular formula is handled by different sources.
Molecular Weight
Depending on the molecular formula, the molecular weight may also vary. Generally speaking, the molecular weight of anhydrous ammonium metatungstate is about 3060.46, but the molecular weight of ammonium metatungstate containing water of crystallization will increase accordingly.
CAS No.
14311-52-5 (Please note that different sources may provide different CAS numbers, such as 12333-11-8, etc., which may be due to differences in compound status or purity).
- Physical Properties
Appearance
Technical grade ammonium metatungstate is usually white or light yellow crystalline powder with good crystallinity.
Solubility
Ammonium metatungstate is easily soluble in water, which makes it very convenient in preparing aqueous solutions. Meanwhile, its solubility can be adjusted by changing the pH value of the solution, thus better controlling the properties of the final product.
Thermal stability
Ammonium metatungstate has high thermal stability and can withstand high temperature without decomposition, which makes it widely used in high temperature applications.
Uses
Raw material of catalyst
Technical grade ammonium metatungstate is the main raw material for tungsten-based catalysts in oil refineries, and it is also used in the manufacture of various petrochemical catalysts. These catalysts play a key role in petroleum processing and chemical industry, which can increase production efficiency and improve product quality.
Metal Preparation
Ammonium metatungstate can be used to prepare tungsten metal and alloy steel. Tungsten is an important strategic metal with high melting point, high density, high hardness and good electrical and thermal conductivity, which is widely used in aerospace, defense and military, electronic information and energy.
Other industrial applications
Ammonium metatungstate is also used in the manufacture of fireproof fabrics and in the ceramic industry. In fireproof fabrics, it can improve the high temperature resistance of fabrics; in the ceramic industry, it is used as an important raw material.
Production process
The production of industrial-grade ammonium metatungstate involves a variety of processes, including neutralization method, tungstic acid method, thermal decomposition method, solvent extraction method and ion exchange method. The selection of these processes depends on factors such as raw material sources, production conditions and product requirements.
- Precautions
Although industrial grade ammonium metatungstate has wide application prospect and market demand, its safety and environmental protection should be paid attention to in the process of use. The compound may have toxic effects if ingested, and contact with skin may cause irritation. In addition, due to its flammability, it should be stored and handled carefully to avoid fire hazards. Meanwhile, relevant environmental regulations and standards should be observed during production and use to minimize pollution to the environment.
In summary, industrial grade ammonium metatungstate is an important inorganic compound and industrial raw material with wide application fields and market demand. In the process of use, attention should be paid to its safety and environmental protection to ensure its safe and effective use.
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