Ultrasonic Effect Crystallization of Ammonium Paratungstate from Aqueous Solution

By evaporating and neutralizing of two ammonium tungstate with different density ,crystals of ammonium paratungstate (NH1)10W12O11·Nh2o(n=11,7,5)were prepared with ultrasonic .UsingXRD,DTG and granularity analysis, the crystalline form was confirmed and researched .The results proved that the effect of ultrasonic on ammonium tungstate was in evidence .The crystalline forms were the same with ultrasonic and without ultrasonic, but impure apexes on the XRD patterns were less and value of d/A more tallied with literature with ultrasonic . Distributing of crystalline granularity became narrower and the crystal was more homogeneous. Ultrasonic shortened the formation time nucleus of crystal .

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