Inthispaperthecalcinationandacidleachingwascarriedoutbycombiningthephosphogypsumwastedecolorizationandpreparationofcalciumsulfatewhiskerbyhydrothermalsynthesismethodasrawmaterialtostudyonthepreparationofammoniumsulfate.Thedecolorizationofphosphogypsumphosphogypsumaspectsaccordingtothecomposition,finenessandothercharacteristics,theuseofdifferentadmixturessensitivitytothedifferentteaching,throughvarioustestdatacomparison,selecttheappropriatecalcinationtemperature,calcinationtime,leachingtime,leachingtemperature,sulfuricacidconcentration,liquidtosolidratioandotherfactorsonthephosphorusgypsumwhitedegree.Thebetterbleachingwhiteningprocessconditionswere:temperature600.C,thecalcinationtime60min,leachingtime,leachingtemperature90180min.C,sulfuricacidconcentration,liquidtosolidratio5:130%.水热法制备硫酸钙晶须后的废液含有大量的硫酸根离子,用其废液制备硫酸铵不但可以实现产品制备还有可以实现循环水再利用。利用还有大量硫酸根离子的废水和碳酸氢铵的反应制备硫酸铵,通过各种试验数据的对比选择合适的反应时间、反应温度、搅拌速率、物料比。通过试验优选选择了最佳的实验工艺为条件:反应时间为60min,反应温度为50。C,物料比[n(HCO31-)/n(SO42-)]为1.1,搅拌速率300r/min。Hydrothermalpreparationofwastecalciumsulfatewhiskercontainingsulfateions,preparationofammoniumsulfatecannotonlyrealizethepreparationofproductsandcanberecycledwaterreusethewastesystem.Therearealargenumberofsulfateionsandammoniumhydrogencarbonatewaspreparedbythereactionofammoniumsulfateutilization,throughthecomparisonofvarioustestdataselectionsuitablereactiontime,reactiontemperature,stirringrate,materialratio.Byoptimizationchoiceexperimenttechniqueforoptimumconditions:reactiontime60min,reactiontemperature50.C,materialratio[n(HCO31-)/n(SO42-)]1.1,stirringrateof300r/min. Keywords:phosphogypsum,decolorization,ammoniumsulfate,influencefactors