The principle of preparing ammonium metatungstate by thermal decomposition method mainly involves thermal decomposition of raw material compounds under high temperature conditions to produce ammonium metatungstate. The details of the principle of preparing ammonium metatungstate by thermal decomposition are as follows:
Reaction Raw Material
The raw material is usually ammonium paratungstate (APT) or other tungsten-containing compounds.
Thermal decomposition process
Under high temperature conditions (e.g. 200~280°C), ammonium paratungstate undergoes thermal decomposition reaction. During the reaction, ammonium paratungstate loses part of its ammonium and water of crystallization, and is converted into ammonium metatungstate, which is easily soluble in water.
Reaction equation
Although the direct thermal decomposition reaction equation is not explicitly given in the referenced article, based on the principle of thermal decomposition of ammonium metatungstate, it can be hypothesized that the reaction may involve a similar process, i.e., the decomposition of ammonium sec-tungstate to form tungstate and ammonia gas.
For reference, the equation of the thermal decomposition reaction of ammonium metatungstate at high temperature is: 2AMT → WO3 + 2NH3 (where AMT stands for ammonium metatungstate). Note, however, that this is the thermal decomposition of ammonium metatungstate itself and not a direct equation for the preparation of ammonium metatungstate from ammonium sec-tungstate.
Influencing factors
The thermal decomposition process is mainly influenced by factors such as temperature, pressure and catalyst. Temperature is the key factor controlling the rate of thermal decomposition reaction and product composition. In the appropriate temperature range, the thermal decomposition efficiency and product purity can be improved.
Pressure and catalyst selection may also have an effect on the thermal decomposition process, but the specific influence mechanism needs further experiments and research.
Product treatment
The products after thermal decomposition need to undergo appropriate treatment, such as dissolution, filtration, evaporation crystallization and other steps, in order to obtain pure ammonium metatungstate products.
The principle of preparing ammonium metatungstate by thermal decomposition method is to make ammonium paratungstate undergo thermal decomposition reaction by high temperature, which is converted into ammonium metatungstate that is easily soluble in water. The process is affected by factors such as temperature, pressure and catalyst, and the process parameters need to be optimized to obtain a high purity product.
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