Thermal Decomposition of Monoclinic Ammonium Paratungstate

Thermal decomposition of monoclinic ammonium paratungstate was investigated by differential scanning calorimetry and laser granulometry.The results show that extent of product particle refining is maximum at(253.3℃,)secondly at 232.9℃;extent of product particle coarsening is maximum at 297.4℃,secondly at 432.1℃ and change in particle size at 150.2℃ and 500℃ is not apparent when heating at rate of 9℃/min in Ar.Monoclinic ammonium paratungstate with different particle size can be obtained by heating stages.

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