Although the thermal decomposition method for smelting ammonium metatungstate has some advantages, such as controllable cost, simple preparation facilities and processes, and is suitable for large-scale industrial production, it also has some disadvantages, which can be summarized as follows:
High temperature control requirements
The temperature control of ammonium metatungstate is strict during the dehydration process, otherwise it is easy to cause the crystals to melt. The thermal decomposition method requires precise control of the thermal decomposition temperature between 200 and 280°C. If the temperature is too high, insoluble tungsten oxide will be generated. If the temperature is too low, the ammonia and water in ammonium paratungstate will not be removed enough, resulting in unstable quality of ammonium metatungstate products.
Strict operating environment requirements
Since ammonium metatungstate is highly soluble in water, easy to deliquesce in the air, and has poor stability, it is necessary to pay attention to ventilation and dry environmental conditions during the preparation process. At the same time, the thermal decomposition method requires the use of high-temperature equipment, and operators need to take personal protection to avoid dangers such as accidental inhalation and accidental ingestion.
The subsequent processing process is complicated
Although ammonium metatungstate can be prepared by thermal decomposition, the subsequent processing process is relatively complicated, including evaporation concentration, filtration separation, granulation and other steps, which requires a certain amount of time and energy.
Limited product quality and purity
Since the thermal decomposition method is affected by various factors such as temperature, pressure, catalyst, etc., the quality and purity of the prepared ammonium metatungstate product may be subject to certain restrictions. In order to obtain high-purity ammonium metatungstate products, it is necessary to strictly control the thermal decomposition temperature range and timely and accurately detect the ammonium content in the product.
In summary, although the thermal decomposition method of ammonium metatungstate smelting is an effective preparation method, in practical applications, it is necessary to pay attention to temperature control, operating environment, subsequent processing technology, product quality and purity and other issues.
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