Process Introduction for Phosphogypsum Purification and Gypsum Calcination

The wet phosphoric acid plant features large amount of by product phosphogypsum, which poses significant pollution to the environment and must be treated before comprehensive utilization. The characteristics of main types of chemical gypsums, the impact of impurities on the gypsum products, as well as the impurity's grain size distribution in the phosphogypsum is introduced. The phosphogypsum purification and gypsum calcinations processes are introduced and it is concluded that the slow calcinations and quick calcinations have their respective advantages and disadvantages, and the calcinated building gypsum powder will meet quality requirements for gypsum products.