Advantages of preparing ammonium metatungstate by thermal decomposition:
Mature process
Thermal decomposition method is one of the mainstream processes for the production of ammonium metatungstate in the industry at present, and its process is relatively mature and easy to operate.
High conversion rate
Under appropriate temperature and conditions, thermal decomposition method can effectively convert ammonium paratungstate into ammonium metatungstate with high conversion rate. Although there is the challenge of difficult to complete conversion, high conversion rate can be achieved by optimizing process conditions.
Raw material is easy to obtain
Ammonium paratungstate is the main raw material for the preparation of ammonium metatungstate, which is widely available and relatively stable in price.
Disadvantages of thermal decomposition method for the preparation of ammonium metatungstate
Strict conditions of thermal decomposition
Thermal decomposition method needs to strictly control the conditions of reaction temperature, time and pH value to ensure the quality and purity of the product. The conditions of thermal decomposition of ammonium paratungstate are strict, and the end point of thermal decomposition is difficult to be judged accurately, and it is difficult to control the maximum conversion rate.
Generation of tungsten oxide
In the process of thermal decomposition, if the temperature is too high, insoluble tungsten oxide (WO3) may be produced, which affects the purity and quality of the product. If the approach of overheating is taken, more tungsten oxide will be produced, which will lead to the decrease of the recovery rate of ammonium paratungstate.
Recovery rate problem
The recovery rate of ammonium metatungstate may be affected due to the insoluble substances and impurities that may be produced in the process of thermal decomposition. Due to the difficulty of filtering tungsten oxide, the recovery rate is reduced to only 70%~80%.
Solution complication
During the dissolution of the thermal decomposition product, a small amount of ammonium paratungstate may remain in the solution, complicating the solution. This may cause the clarity of the ammonium metatungstate solution to be affected, requiring additional treatment steps to remove these impurities.
Equipment investment and maintenance costs
Pyrolysis requires specific equipment and facilities to support it, which may increase equipment investment and maintenance costs. Also, high temperature operation may increase energy consumption and safety risks.
In summary, the preparation of ammonium metatungstate by thermal decomposition has the advantages of mature process and high conversion rate, but it also has the disadvantages of strict conditions of thermal decomposition, generation of tungsten oxide, problem of recovery rate, solution complication and equipment investment and maintenance cost. In practical application, it is necessary to choose the appropriate preparation method and optimize the process conditions according to the specific situation.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
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