Ammonium Paratungstate Physical Property Affected by PH Value

Average grain size and distribution of particle of ammonium paratungstate is affected by the PH value of solution. Nucleary speed and crystalline speed is affected by PH value apparently. After crystallization, the PH value is controlled between 8.0-7.8, it will reduce the nucleary amount and forming speed, the small amount of crystal nucleus can turn into large grain size steadily, also the limited PH value will make the coarse ammonium paratungstate which is distributed evenly.

Adding 10%-20% dilute hydrochloride acid into solution to the PH value 6.5-7.5, the apparent density of crystal decreases, the crystal shape is regular which makes it more convenient to prepare fine ammonium paratungstate particle. By adjusting crystallization mother liquor to the ideal PH value 6.0-8.0 and heat to above 50 degree Celsius will obtain high purity ammonium paratungstate crystal.




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