Thermal decomposition temperature is a key parameter when preparing ammonium metatungstate by thermal decomposition method. According to the information in the reference article, the thermal decomposition temperature usually needs to be carried out within a certain range to ensure the effective decomposition and generation of ammonium metatungstate.
Specifically, when ammonium metatungstate is prepared from ammonium paratungstate by thermal decomposition method, the thermal decomposition temperature is usually controlled at 200-280°C. In this temperature range, ammonium paratungstate will lose part of the ammonium and water of crystallization, and be transformed into ammonium metatungstate which is easily soluble in water.
It should be noted that the selection of the thermal decomposition temperature may be affected by specific process and equipment conditions. Therefore, in actual operation, the thermal decomposition temperature may need to be fine-tuned according to specific conditions. In addition, the decomposition temperature of ammonium metatungstate is also related to its decomposition products. At lower temperatures (e.g. 200-300°C), ammonium metatungstate mainly removes all the water of crystallization and most of the ammonium ions; at higher temperatures (e.g. 500-550°C), ammonium metatungstate will decompose further, and products such as tungsten trioxide (WO3) may be generated eventually. Therefore, when choosing the thermal decomposition temperature, the desired final product and process requirements also need to be considered.
In summary, when preparing ammonium metatungstate by thermal decomposition method, the thermal decomposition temperature is usually controlled at 200-280°C, but the specific temperature may need to be adjusted according to the actual situation.
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