The comprehensive utilization of phosphogypsum is of great significance to the sustainable development of phosphor-chemical enterprise and the eco-environmental protection of the Yangtze River Valley.However,the phosphogypsum contains a small amount of phosphorus,fluorine,organic compounds,and so on.The harmful impurities impact its application performance,which can′t be used directly.So,the distribution and removal of water-soluble phosphorus and water-soluble fluorine in phosphogypsum from a company in Anning were studied by lime neutralization,water washing and flotation.The results showed that the water-soluble phosphorus and water-soluble fluorine in phosphogypsum could be removed effectively by gypsum mixing,adding lime and mother solution cyclic utilization technique.The removal rates of them were 74.95% and 76.20% respectively,and their contents were 0.090% and 0.043% separately,which could meet the limit requirements of secondary indicators in GB/T 23456—2018《phosphogypsum》 standard.The water-soluble phosphorus and water-soluble fluorine could also be removed effectively by the three-stage countercurrent washing process.The removal rates of them were 78.81% and 89.94% respectively,and their contents were 0.087% and 0.018% separately.The quality of the pretreated phosphogypsum also could meet the secondary grade index requirements of GB/T 23456—2018《phosphogypsum》 standard.The efficiency separation of CaSO₄·2H₂O and SiO₂ was successfully achieved by the direct flotation process of one-stage roughing and two-stage cleaning.Simultaneously,the water-soluble phosphorus and the water-soluble fluorine in phosphogypsum were also effectively removed.Thus the quality of phosphogypsum was improved and reached the first-grade index requirements of GB/T 23456—2018《phosphogypsum》.From the perspective of economic feasibility and the analysis of the current low value utilization of phosphogypsum,the gypsum slurry mixing lime mother liquor circulating phosphogypsum pretreatment process formed by research is more applicable.