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1、Crespondingauth:SadaSahussahu@CO2ReducingCementBasedonCalciumSilicatesS.Sahu1S.Quinn1V.Atakan1N.DeCristofaro1G.Walenta21.SolidiaTechnologies11ColonialDrivePiscatawayNJ08854USA2.LCR95rueduMontmurierBP1538291SaintQuentinFa

2、llavierCedexFranceAbstractAnewtypeofcementismadefromrawmaterialsthataretypicallyusedtomakedinaryPtlcement(OPC)clinker.ThekilnfeedrawmixproptionsareadjustedsoastoproduceaclinkerrichinlowlimecalciumsilicatephasessuchasCSC3

3、S2insteadofthehighlimephasesC3SC2StypicalofOPC.Productionofsuchclinkerrequires30%lesslimestonecomparedtoOPCclinkerallowssinteringattemperatureaslowas1200oCcomparedto1450CfOPC.Theclinkerisgroundtomakeacementofsimilarfinen

4、esstoOPCitstotalmanufacturingCO2emissionsareestimatedtobe30%lessthanfOPC.Thiscementdoesnothardenbyhydrationratherithardensbycarbonation.ItsmaincarbonationproductsareCaCO3SiO2.TheCaCO3isprimarilyfmedascalcitewithsomevater

5、ite.TheSiO2ispresentinanoncrystallinefm.Microstructuralevaluationshowsthatsiliconislessmobilethancalciumduringcuringremainsaroundthecementparticles.HowevertheCaCO3precipitatesinthepespacesofthecementmatrix.Thiscementisap

6、atentedcementofSolidiaTechnologiesiscommerciallyavailableasSolidiaCement?.iginalityThisisiginalwkcarriedoutatSolidiaTechnologies.Keywds:CO2reductionCarbonationCaCO3CO2emissionCS1.3.CarbonatableCalciumSilicateCementCO2Emi

7、ssionsSincethehighlimephasespresentinPtlcementclinkercanbeomittedtherequirementfCaOintheclinkerisreduced.Asdiscussedinsection1.1upto~67%ofCO2emittedduringtheproductionofPtlcementclinkerinahighefficiencykilnmaybeduetothec

8、alcinationofCaCO3withintherawmaterials.FCCSCthelimecontentcanbereducedfrom70%to45%whichtranslatestoareductionofCO2emissionsfrom540to370kgpertonneofclinkerduringthecalcinationprocess.TheremainingCO2emissionsareduetothecom

9、bustionofcarbonrichfuelswithinthekiln.Thecalcinationoflimestoneisastronglyendothermicreactionconsumesmostoftheheatinputsothereductioninkilnfeedlimestonecontentalsoleadstoasignificantreductioninkilnfuelrequirements.Thefma

10、tionofclinkerphasesisalsomeexothermicfCCSCthanfOPCwhichfurtherreduceskilnfuelrequirements.Inadditionthereisasmallextrasavingsduetothereductioninthepeaksinteringtemperaturefrom~1450CneededtomakeOPCclinkerdowntoaslowas~120

11、0CfCCSChoweversincethecementkilnisanefficientcountercurrentheatexchangerthispeaktemperaturechangeonlyaffectsfuelconsumptionbyafewpercent.Thecombinedeffectisapotentialkilnfuelsavingsof~30%.Thecalculatedheatsofreactionares

12、ummarizedinTable1(SahuS.DeCristofaroN.2013).Inthiscalculationseveralassumptionsweremadesotherealnumbermaybeslightlydifferentthanwhatisreptedhere.TheCO2emissionsascalculatedbyreductionofCaCO3intherawmixanestimated30%fuels

13、avingsareshowninTable2.ThedetailsoftheCO2savingopptunitiesarealsodiscussedinpreviouspublications(DeCristofaroN.SahuS.2014AtakanV.etal2014).Table1:ReactionenthalpiescalculatedfPtlcementclinkeratheeticalcarbonatablecalcium

14、silicateclinker.Carbonatablecalciumsilicateclinkernumbersarebasedonamodeledclinkermayvaryslightlydependingonphasecomposition.ReactionPtlcementclinkerΔH(GJt)CarbonatablecalciumsilicateclinkerΔH(GJt)Calcination2.1381.514De

15、compositionofclays0.0630.075Fmationofclinkerphases0.3770.538Total1.7571.051Table2:SummaryofCO2emissionsasreptedfPtlcementclinkercomparedtothepredictedCO2emissionsfacarbonatablecalciumsilicateclinker.CO2EmissionsourcePert

16、onnePtlcementclinkerPertonnecarbonatablecalciumsilicateclinkerChangeCalcination540kg375kg30.6%Combustion270kg190kg29.6%TotalCO2Emission810kg565kg30.2%2.Experimental2.2.SynthesisofCarbonatableCalciumSilicateCementCCSCwasp

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