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Simulation of the Gypsum Crystallization Process in Wet Phosphoric Acid Manufacture

Using crystallization mechanisms and the population balance relation approach, mathematical models were developed for the gypsum crystallization section of a phosphoric acid plant. Depending on the assumptions made, various models of increasing complexity were obtained. These models predict the crystal size distribution of the gypsum, and thus allow an estimate of the filtering characteristic to be predicted. All models show that seed stream recycle ratio (range 0.5 t o 2) has little effect on crystal filterability.