The purification of gypsum , the majority of mines in China use hand selection. When high quality ore is required, it is purified by beneficiation . At present, Hubei Yingcheng gypsum photoelectric beneficiation industry test has obtained satisfactory results. Photoelectric beneficiation is a method of sorting by using the principle of photoelectric effect by utilizing the difference in light between gypsum and gangue. The ore processing capacity is 2.2 tons/hour, the selected grain size is 20-50mm, and the gypsum grade is 20-40%. It is sorted by dry method and once selected by rough selection. The concentrate with gypsum content of 95% and recovery rate of over 80% is obtained. . Heavy medium dressing of gypsum is more commonly used in the United States and the United Kingdom, and it can effectively remove carbonate impurity minerals. The use of water washing to remove shale minerals and the use of flotation to select gypsum have been successful examples.
The demand for gypsum deep processing products, plasters, is increasing in the construction industry and the ceramic industry. The processing technology of the plaster is mainly: dry-burning production-β-type hemihydrate gypsum, autoclaving to produce α-type hemihydrate gypsum, high-temperature calcination to produce anhydrous gypsum.
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