磷石膏基早强胶凝材料开发与废弃物资源化利用

磷石膏基早强胶凝材料开发与废弃物资源化利用摘要：

近年来，伴随着社会经济的持续发展和工业化进程的不断推进，建筑行业对于早强胶凝材料的需求逐渐增多。传统的早强胶凝材料由于其制备过程繁琐、耗能量大、配合比难以调整等缺点，越来越难以满足市场需求。此外，环境问题也是制约早强胶凝材料发展的重要因素。为了寻求新的早强胶凝材料解决方案，研究者们开始探寻废弃物资源化利用的可能性，磷石膏成为了被广泛关注的研究对象之一。

本论文以磷石膏为主要原材料，混合适量的水泥、膨胀剂等，在综合考虑早强性能、变形性能、抗裂性能等多个指标的基础上，设计并制备出了符合要求的磷石膏基早强胶凝材料。其中，探究了不同配合比、水胶比、膨胀剂掺量等因素对材料性能的影响，并针对其微观结构、化学组成等方面进行了分析。

结果表明，本研究开发的磷石膏基早强胶凝材料具有强度高、早期强度明显、抗渗性能好、延性高等优点。制备过程较为简单，取原材料的过程中较为环保。此外，本研究还对磷石膏废弃物的资源化利用进行了探究，发现磷石膏可以用于提高水泥基材料的性能、制备多孔陶瓷材料等领域，实现了对废弃物的高效利用。

关键词：磷石膏；早强胶凝材料；资源化利用；废弃物

DevelopmentandResourceUtilizationofPhosphogypsum-basedEarlyStrengthCementitiousMaterials

Abstract:

Inrecentyears,withthecontinuousdevelopmentofsocialeconomyandthecontinuousprogressofindustrialization,thedemandforearlystrengthcementitiousmaterialsintheconstructionindustryhasgraduallyincreased.Traditionalearlystrengthcementitiousmaterialsarebecomingincreasinglydifficulttomeetmarketdemandduetotheircomplicatedpreparationprocess,highenergyconsumption,anddifficultadjustmentofmixingratio.Inaddition,environmentalproblemsarealsoanimportantfactorrestrictingthedevelopmentofearlystrengthcementitiousmaterials.Inordertoseeknewsolutionsforearlystrengthcementitiousmaterials,researchershavebeguntoexplorethepossibilityofresourceutilizationofwastematerials,andphosphogypsumhasbecomeoneofthewidelystudiedobjects.

Inthispaper,phosphogypsumisusedasthemainrawmaterial,andmixedwithappropriateamountofcement,expansionagent,etc.Basedonthecomprehensiveconsiderationofearlystrengthperformance,deformationperformance,crackresistanceperformanceandotherindicators,phosphogypsum-basedearlystrengthcementitiousmaterialsthatmeettherequirementsaredesignedandprepared.Theinfluenceofdifferentmixingratios,watercementratios,expansionagentdosagesandotherfactorsonthematerialpropertieswasinvestigated,andthemicrostructureandchemicalcompositionwereanalyzed.

Theresultsshowthatthephosphogypsum-basedearlystrengthcementitiousmaterialsdevelopedinthisstudyhavetheadvantagesofhighstrength,obviousearlystrength,goodimpermeability,highductility,etc.Thepreparationprocessisrelativelysimple,andthecollectionofrawmaterialsisenvironmentallyfriendly.Inaddition,thisstudyalsoexploredtheresourceutilizationofphosphogypsumwasteandfoundthatphosphogypsumcanbeusedtoimprovetheperformanceofcement-basedmaterials,prepareporousceramicmaterialsandotherfields,realizingtheefficientutilizationofwastematerials.

Keywords:phosphogypsum,earlystrengthcementitiousmaterials,resourceutilization,wastematerialsPhosphogypsumisawastematerialgeneratedduringtheproductionofphosphoricacidfromphosphaterock.Itisalarge-scaleindustrialwastematerialwithhighcontentofsulfate(SO42-),fluoride(F-),andheavymetalions,whichposesseriousthreatstotheenvironmentandhumanhealth.Therefore,itisofgreatsignificancetoexploretheresourceutilizationofphosphogypsumwaste.

Thestudyfoundthatphosphogypsumcanbeeffectivelyusedasarawmaterialforthepreparationofearlystrengthcementitiousmaterials.Byusingphosphogypsumasanactivator,theearlystrengthofcementitiousmaterialscanbesignificantlyimproved,andtheamountofcementcouldbereduced,whichnotonlyreducesthecostofproductionbutalsoreducesthegreenhousegasemissionscausedbytheproductionofcement.

Furthermore,thestudyalsofoundthatphosphogypsumcanbeutilizedinthepreparationofporousceramicmaterials.Theadditionofphosphogypsumcanimprovetheporosityoftheceramicmaterial,andenhanceitsmechanicalproperties,whichexpandsthescopeofapplicationofphosphogypsumwaste.

Therefore,theefficientutilizationofphosphogypsumwastecannotonlysolvetheenvironmentalproblemscausedbytheaccumulationofwasteinlargequantitiesbutalsoreducetheproductioncostsofcementitiousmaterialsandceramicmaterials,andpromotethesustainabledevelopmentoftheindustry.Inconclusion,theutilizationofphosphogypsumwasteisapromisingwaytosolveenvironmentalproblems,whichdeservesfurtherattentionandresearchOnepossibleapplicationofphosphogypsumwasteisintheconstructionindustry,whereitcanbeusedasasubstitutefornaturalgypsumintheproductionofvariousbuildingmaterials,suchasdrywall,plaster,andcement.Thisnotonlyreducesthedemandfornaturalresourcesbutalsosavesenergyandreducesgreenhousegasemissionsassociatedwiththeextraction,transportation,andprocessingofnaturalgypsum.

Anotherpotentialapplicationofphosphogypsumwasteisintheagriculturalsector,whereitcanbeusedasasoilamendmenttoimprovesoilfertilityandcropyields.Phosphogypsumcontainshighlevelsofcalcium,sulfur,andothernutrientsthatarebeneficialforplantgrowth,aswellastraceamountsofheavymetalsthatcanbesafelyimmobilizedbyincorporatingthewasteintothesoil.Moreover,theuseofphosphogypsumasasoilamendmentcanalsohelptoreducesoilerosion,increasewaterinfiltration,andmitigatesalinityandalkalinityproblems.

Inaddition,phosphogypsumwastecanalsobeusedasarawmaterialfortheproductionofvariousindustrialchemicals,suchassulfuricacid,phosphoricacid,andammoniumsulfate.Thesechemicalsarewidelyusedinvariousindustries,suchasfertilizerproduction,metalprocessing,andpapermanufacturing,andtheirproductionfromphosphogypsumwastecanreducetheenvironmentalimpactassociatedwiththeirproductionfromnon-renewableresources.

Furthermore,phosphogypsumwastecanalsobeusedasafeedstockfortheproductionofvalue-addedproducts,suchasporousceramicmaterialsandadsorbents,thathaveawiderangeofapplicationsinvariousindustries.Forexample,porousceramicmaterialscanbeusedasfilters,catalysts,andthermalinsulationmaterials,whileadsorbentscanbeusedforwastewatertreatment,airpollutioncontrol,andgasseparation.

Overall,theefficientutilizationofphosphogypsumwastehasthepotentialtoprovidearangeofeconomic,environmental,andsocialbenefits,suchasreducingwastedisposalcosts,conservingnaturalresources,improvingsoilfertility,andpromotingsustainabledevelopment.However,tofullyrealizethesebenefits,furtherresearchanddevelopmentareneededtoovercometechnical,economic,andregulatorybarriers,andtopromotetheadoptionofinnovativeandsustainablewastemanagementpracticesOneofthemajortechnicalissuesthatneedtobeaddressedinutilizingphosphogypsumwasteisitshighradioactivitylevels.Radioactivityisasignificantconcern,asitcanposehealthriskstoworkersandtheenvironment.Therefore,extensivestudiesarerequiredtoassessthesafetyofphosphogypsumproductsfortheirintendeduse.Inaddition,thecurrenteconomicconstraintsmakeitchallengingtoinvestininnovativeandsustainablewastemanagementpractices.Thehighcostofinvestinginthesepracticesmay,inturn,discouragewidespreadadoptionbyindustries.

Moreover,regulatoryissuessurroundingtheutilizationofphosphogypsumwasteneedtoberesolvedtoenableitsfullpotentialtoberealised.Legalbarrierstothereuseofwastestreamsvarybycountry,anduntiltheseregulationsareestablished,reuseofphosphogypsumwastewillremainlimited.Addressingtheseregulatoryhurdleswillrequireincreasedcollaborationbetweengovernmentandindustrystakeholders.

Anotherissueistheneedforfurtherresearchanddevelopmentrelatingtooptimalmethodsofutilizingphosphogypsumwaste.Innovativetechniquesshouldbedevelopedthatwillenablethereuseofthewastetobemoreeco-friendlyandcost-effective,thusaddressingboththeenvironmentalandeconomicconcerns.Researchersshouldfocusondevelopingnewandimprovedmethodsthatwillencouragethewideruseofphosphogypsumproducts.

Inconclusion,thepotentialbenefitsofutilizingphosphogypsumwastearesignificant,butvarioustechnical,economic,regulatory,anddevelopmentalchallengesneedtobeaddressedforthistobeachieved.Innovativeandsustainablewastemanagementpracticesareessentialtomakingfulluseofphosphogypsumwaste,buttheseshouldbecost-effectiveandres