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Crystal Research and Technology |
Cryst. Res. Technol. 39,
123 (2004) - Abstract -
Crystallization of phosphogypsum in continuous phosphoric acid industrial plant
E. A. Abdel-Aal
Central Metallurgical Research and Development Institute, P.O. Box: 87 Helwan, Cairo, Egypt
| Keywords | calcium sulfate dihydrate, phosphogypsum, primary nucleation, secondary nucleation, crystallization, Abu-Tartur phosphat concentrate |
| PACS | 81.10.-h |
| DOI | 10.1002/crat.200310159 |
Understanding crystallization of phosphogypsum is generally of basic importance for industrial wet-process phosphoric acid production. In this paper, measuring the phosphogypsum crystal size distribution during primary and secondary nucleation is reported. The results show that, secondary nucleation was occurred at 5 hr run time (12.5% solid content). Crystal growth rates were about 18.4 μm/hr at 2.5% solid content and about 4.5 μm at 30% solid content. At steady state (16 hr run time and 30% solid content), the mean diameter of the crystals and the average specific surface area are about 25 μm and 0.69 m2/g, respectively.
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