4.6 Article

The Influence of Impurities on the Dehydration and Conversion Process of Calcium Sulfate Dihydrate to α-Calcium Sulfate Hemihydrate in the Two-Step Wet-Process Phosphoric Acid Production

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Study on the Kinetics of Hydration Transformation from Hemihydrate Phosphogypsum to Dihydrate Phosphogypsum in Simulated Wet Process Phosphoric Acid

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Summary: The study found that the hydration rate of alpha-hemihydrate phosphogypsum to dihydrate phosphogypsum in wet process phosphoric acid recrystallization is significantly influenced by temperature, phosphoric acid concentration, and SO42- ion concentration. Controlling temperature, phosphoric acid concentration, and SO42- ion concentration is crucial for improving the conversion rate of alpha-hemihydrate phosphogypsum to dihydrate phosphogypsum and product purity in the production of wet process phosphoric acid.

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