Amelioration of phosphoric acid separation from phosphogypsum crystals using physical and chemical techniques

E. A. Abdel-Aal*, Central Metallurgical Research and Development Institute (CMRDI), Egypt

This study was carried out to enhance the filtration rate of phosphoric acid from calcium sulfate dihydrate (gypsum) under simulated conditions of phosphoric acid production using Dihydrate process. The applied techniques physical and/or chemical techniques. In industry, better filtration rate of phosphoric acid filtration from phosphogypsum means higher production as well as less capital and operation costs. Physical technique is related to decreasing the cake thickness via increasing rotation speed of filter under the standard applied vacuum. Chemical techniques lead to modification of crystals by different additives which added individually. This include but not limited to surfactants, polymers, aluminum bearing materials, oxidizing agents, blending of two phosphate ores, …..etc.

Phosphoric acid is produced using standard continuous unit simulates Dihydrate process of single tank reactor. The specific optimum conditions of reaction and crystallization of each phosphate ore was applied. To understand effect of additive from fundamentals point of view, induction time was measured under different supersaturation ratios. This is the time elapsed between the achievement of supersaturation ratio and the appearance of a solid phase. The results show that...

Session: L20 - Enhancement of backwashing and cake filtration performance
Day: 24 October 2019
Time: 14:45 - 16:00 h

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