Spherical Crystal Ammonium Paratungstate Preparation Affecting Factors

Below are the affecting factors of spherical crystal ammonium paratungstate preparation:

1.Under low speed of stirring, granulation rate of ammonium paratungstate is lower. When the stirring speed reaches to 80-90r/min, the granulation rate is ideal. With the increase of stirring speed, the granulation rate falls down.

2.With the increase of crystallization temperature, the granulation rate of ammonium paratungstate falls down. Consider of production cycle, crystallization should be under 85 degree Celsius.

3.With the postponed of time for adding liquid material, the granulation rate of ammonium paratungstate goes up. Consider of fisher particle size, loose density, flow ability and uniformity of particle, liquid material should be added under the solution density 16Be.

4.With the increase of liquid material amount, the granulation rate of ammonium paratungstate gose up. It reaches the maximum level when the adding amount is one time more than the original value. As the adding amount increasing, granulation rate falls down.

5.With the raising of adding speed, the granulation rate also goes up. Consider of fisher particle size, loose density, flow ability and uniformity of particle, liquid material should be added every three hours.


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