There are significant differences between ammonium metatungstate prepared by thermal decomposition method and wet method in terms of preparation principle, operation process, product characteristics, etc. The specific points can be expressed and summarized from the following aspects:
- Preparation principle
Thermal decomposition method
By heating ammonium paratungstate (APT), it decomposes at a certain temperature and is converted into ammonium metatungstate (AMT). This method mainly relies on the input of thermal energy to cause chemical changes in the raw materials.
wet preparation method
Ammonium metatungstate is prepared by a chemical reaction in solution. This usually involves dissolving tungstic acid or tungstate in an appropriate solvent, and then going through steps such as precipitation, filtration, and drying to obtain the ammonium metatungstate product. Wet preparation methods rely more on chemical reactions and solution processing.
- Operation process
Thermal decomposition method
After mixing ammonium paratungstate and a small amount of citric acid catalyst, put it into a far-infrared rotary furnace.
It decomposes at a temperature of 200 to 280°C for about 1 hour.
The ammonium metatungstate product is obtained through steps such as evaporation concentration, filtration and separation.
The temperature control requirements are high and the decomposition conditions need to be precisely controlled to obtain stable product quality.
wet preparation method
Dissolve tungstic acid or tungstate in the solvent.
Chemical reactions are carried out by adjusting the pH value, adding precipitants, etc.
After precipitation, filtration, drying and other steps, the ammonium metatungstate product is obtained.
The operation is relatively simple, but may require the consumption of large amounts of solvents and auxiliary raw materials.
- Product features
Thermal decomposition method
The product quality is stable and the purity is high.
It is suitable for large-scale industrial production and can meet the large market demand for ammonium metatungstate.
The waste generated is relatively small, but attention needs to be paid to energy consumption control and emission issues of high-temperature equipment.
wet preparation method
Product quality and purity may be affected by various factors such as raw material purity, reaction conditions, and operating procedures.
Suitable for laboratory scale or small batch production, and the preparation of ammonium metatungstate products requiring specific purity or form.
A large amount of wastewater and waste residue may be produced, which requires appropriate treatment to reduce the impact on the environment.
- Raw materials and costs
Thermal decomposition method
The main raw material is ammonium paratungstate, which has a relatively low cost, but requires high energy consumption for heating and evaporation processes.
wet preparation method
There may be many types of raw materials, including tungstic acid, tungstate, ammonia, etc., and the cost may vary depending on the type and price of raw materials. In addition, wet preparation methods may consume large amounts of solvents and auxiliary raw materials, thereby increasing costs.
There are significant differences between ammonium metatungstate prepared by thermal decomposition method and wet method in terms of preparation principle, operation process, product characteristics, raw materials and cost. The thermal decomposition method relies on heat energy input and precise temperature control and is suitable for large-scale industrial production; while the wet preparation method relies more on chemical reactions and solution processing and is suitable for laboratory-scale or small-batch production. When choosing a preparation method, trade-offs and choices need to be made based on specific needs and conditions.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
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