Thermal decomposition of ammonium metatungstate (chemical formula: (NH₄)₆H₂W₁₂O₄₀-xH₂O) is a chemical reaction process that occurs under high temperature conditions. The following is a detailed explanation of the thermal decomposition of ammonium metatungstate:
- Thermal decomposition process
Ammonium metatungstate undergoes thermal decomposition reaction at high temperature, and its decomposition process can be roughly divided into several stages:
Initial decomposition
Ammonium metatungstate will firstly lose its water of crystallization, and this process starts at a lower temperature (e.g. 200-300°C), removing all the water of crystallization and most of the ammonium ions.
Phase transition
As the temperature increases (at temperatures of 300-350°C), ammonium metatungstate undergoes a phase transition to produce stabilized tungsten oxide.
Further decomposition
When the temperature continues to rise to 500-550°C, the ammonium root and bound water in ammonium metatungstate will decompose further, but at this time there is still a small amount of ammonium root and bound water that has not decomposed.
Complete decomposition
When the heat treatment temperature reaches above 600℃, ammonium metatungstate can be completely decomposed into tungsten trioxide (WO₃).
- Decomposition products
The main product of thermal decomposition of ammonium metatungstate is tungsten trioxide (WO₃), which is an important inorganic compound with wide applications. In addition, ammonia (NH₃) and water vapor (H₂O) will be produced as by-products in the decomposition process.
- Decomposition temperature
The decomposition temperature of ammonium metatungstate is usually around 400°C-500°C, but the specific temperature will be affected by many factors, such as the heating rate, atmosphere air pressure and impurities. Under pure hydrogen atmosphere, the decomposition temperature may be slightly different.
- Industrial applications
Thermal decomposition of ammonium metatungstate has important applications in industrial production. By controlling the conditions such as temperature and time of thermal decomposition, tungsten trioxide products with different purity and particle size can be prepared, which can be used to manufacture metallic tungsten, alloy steel, fireproof fabrics and so on. In addition, the thermal decomposition of ammonium metatungstate can be used to recycle and reuse waste materials containing tungsten.
The thermal decomposition of ammonium metatungstate is a complex process involving multiple steps and products. By controlling the conditions of thermal decomposition, the desired tungsten trioxide products can be obtained and the recovery and reuse of tungsten-containing waste materials can be realized. This process is of great significance in the production of tungsten metal and related products.
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