The application in the cement industry and gypsum building material on the theoretically, phosphogypsum can be used as base material of cement production, extraction of sulfur, making gypsum. Production of sulphuric acid and cement with phosphogypsum, comparative lack of sulfur resources countries has practical significance, some countries such as Japan, South Korea and Germany, have made certain achievements in this respect, higher utilization of phosphogypsum. China has also done a lot of work, but in fact there are still many problems. Investigate its reason, is mainly the untreated phosphogypsum directly applied to the cement production has the following hazards: in phosphogypsum soluble P2O5 make the phosphorus gypsum is acidic, it will accelerate the corrosion of the equipment at the same time, because of the presence of soluble P2O5, cement setting rate is not normal, may reduce the strength of cement.The moisture content is 20% ~ 30% in phosphogypsum, this can cause caking, bin blockage. Therefore, phosphorus gypsum to obtain the considerable development in cement production, it must be modified. Modification of phosphogypsum methods include washing and calcination method, legal and natural aging. Want to make good use of the red mud, the first thing to do is to break the red mud. Phosphorus gypsum used as another important approach in cement industry is the combined production of sulphuric acid and cement. 

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