Research progress of pretreatment and comprehensive utilization of phosphogypsum
Phosphogypsum with complex impurity composition has been less utilized for a long time and mainly treated by stockpiling,due to the immaturity of pretreatment technology.Faced with the serious en-vironmental pollution problems caused by phosphogypsum stockpiling,it is inevitable to accelerate the re-search on pretreatment and comprehensive utilization of phosphogypsum.The basic properties,production and utilization of phosphogypsum at home and abroad as well as the existing problems were comprehen-sively introduced.The pretreatment and comprehensive utilization of phosphogypsum were highlighted.Physical,chemical and thermal treatments are the main pretreatment methods.The pretreated phosphogyp-sum is mainly used in building materials,chemical industry,agriculture and environment.Research progress of pretreatment methods and the future development direction of comprehensive utilization were summa-rized,and the prospects for solving the problem of phosphogypsum storage were proposed.In order to ab-sorb the accumulated phosphogypsum as soon as possible and achieve the goal of"the 14th Five-Year Plan"bulk solid waste treatment,it is necessary to control the production source,explore the efficient pretreat-ment technology,and strengthen the comprehensive utilization.