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Ammonium Paratungstate(APT) Granular Control

Ammonium Paratungstate Picture

There’re many factors affecting the physical properties (grain size and grain size distribution, morphology, density, etc.), purity and particle size control of ammonium paratungstate , mainly the temperature of the solution, over saturation, stirring intensity, evaporation rate and crystallization rate. Respectively, this article talks about the impact of various factors on the particle size of ammonium paratungstate under control.

1. Temperature

No. Evaporation Crystallization Temperature/ ℃ Apparent Density/ g·cm-3
1 60-70 1.36-1.65
2 84-88 1.60-1.70
3 90-94 1.66-1.85
4 95-100 1.82-2.01

 

2. Agitation Intensity

No. Agitation Speed / r·min-1 FSSS Granularity / μm
1 85 30
2 62 40
3 50 42
4 40 45

 

3. Agitation Time

No. Agitation Time/ min Apparent Density/ g·cm-3
1 30 1.40-1.80
2 60 1.80-1.95
3 120 1.66-2.20
4 constant stirring 2.20-2.40

 

4. Supersaturation

No.

(NH4)2WO4 solution

g/L

NH4Cl

g/L

NH3

g/L

FSSS Granularity / μm
1 125 100 30 30
2 115 65 40 39
3 113 40 40 42
4 120 80 40 38
5 114 60 40 40

 

5. Others

Heating rate, evaporation time.

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