Research progress on crystal transformation mechanism of phosphogypsum
Phosphogypsum is a waste residue discharged during the wet-process phosphoric acid production and contains impurities such as soluble phosphorus,fluorine and alkali metal salts.Simple stacking and landfill disposal of phosphogypsum will lead to problems such as cultivated land occupation and environmental pollution.The dissolution-recrystallization mechanism of phosphogypsum has always been controversial.However,converting it into different crystal forms of gypsum and applying it to different fields is currently the most promising and effective treatment method.The current crystallization mechanisms and controversies of converting phosphogypsum into α-hemihydrate gypsum,β-hemihydrate gypsum and anhydrous gypsum are reviewed,the commonly used crystal transformation methods of phosphogypsum based on the existing mechanisms are introduced,their existing advantages and disadvantages are discussed,and finally the problems and research directions to be solved in the next step are proposed.
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