materialstopreparecompositemortar.Theeffectoftheamountofphosphogypsumaddedonthephenochemicalpropertiesofthecompositematerialwasinvestigated.Thetestsshowedthatwhentheredmuddosagewas70wt%,phosphogypsumdosagewas10wt%,the7dand28dcompressionstrengthofthecompositewere14.97MPaand15.2MPa,respectively.BythecharacterizationandanalysisofthemineralstructureandmicromorphologyofthecompositematerialsbyXRD,SEM⁃EDS,TGandFTIR,itshowedthattheadditionofanappropriateamountofphosphogypsumcouldeffectivelyfilltheinternalstructureofthecompositematerialandimprovethemechanicalproperties;theadditionofexcessivephosphogypsumcouldcauseformationofalargeamountofettringite,thusincreasingtheinternalapertureofthecomposite,atthesametime,thelargeenrichmentofcomponents(PandF)inphosphogypsumwillreducethemechanicalpropertiesofcompositematerials;thecompositematerialcouldfixsodiumelementintheredmudthroughproperlyproportioning.TheleachingtestofcompositematerialsbyICP⁃OESshowedthattheconcentrationofheavymetalelementsinthecomposi...