LIFAC脱硫粉煤灰物相分析

:20020708;:20020815:(1964),,,,.:10079629(2002)04037906LIFAC沈晓冬1,周全2,钟白茜1,熊道银2,罗雪莲1(1.,210009;2.,210011):采用化学分析,TGDSC,FTIR,XRD,SEM/EDS,偏光显微镜等方法,研究了南京下关发电厂炉内喷钙尾部增湿活化(limestoneinjectionintothefurnaceandactivationofcalciumoxide,简称为LIFAC)烟气脱硫工艺产生的LIFAC脱硫粉煤灰的化学组成和物相组成,并与普通粉煤灰作了对比.结果表明,该脱硫粉煤灰除含有普通粉煤灰玻璃相与晶相外,还含有活性fCao,Ca(OH)2,CaSO4,CaSO3和少量未分解CaCO3等脱硫产物.:LIFAC;脱硫;粉煤灰;物相组成:TQ172.4+4:AStudyonMineralPhasesofFlyAshfromLIFACSulphurRemovalProcessSHENXiaodong1,ZHOUQuan2,ZHONGBaiqian1,XIONGDaoyin2,LUOXuelian1(1.CollegeofMaterialsScienceandEngineering,NanjingUniversityofTechnology,Nanjing210009,China;2.NanjingXiaguanPowerPlant,Nanjing210011,China)Abstract:Bymeansofchemicalanalysis,TGDSC,FTIR,XRD,SEM/EDSandopticalmicroscopy,thechemicalcompositionandmineralphasesofflyashfromLIFACsulphurremovalprocessinNanjingXiaguanPowerPlantwerestudied.Theseofordinaryflyashwerealsostudiedascomparison.Theresultsshowthatexceptforglassphaseandcrystalsidenticaltotheordinaryflyash,activefreeCaO,Ca(OH)2,CaSO4,CaSO3andCaCO3remainderaredetectedinLIFACflyash.Keywords:LIFAC;sulphurremoval;flyash;mineralphases,Fortum(IVO)(LIFAC),.199812,LIFAC1,2199972[1].LIFAC900~1250!C,CaOSO2,SO2,,CaOCa(OH)2,SO2SO2,75%~85%,.,,??.,SO2,,,,.54200212JOURNALOFBUILDINGMATERIALSVol.5,No.4Dec.,200211.1LIFAC(LIFACFA);(JLFA)..2fCaO6.42%0.18%,1,.1Table1Chemicalcompositionsofflyashw/%MaterialSiO2Fe2O3Al2O3CaOMgOSO3Na2OK2OIL∀LIFACFA45.803.6627.5613.691.182.500.580.993.9899.94JLFA53.866.4025.904.831.930.600.660.984.8099.961.2fCaO.JEM2010TEM/SEM,NEXUS670360(FTIR),DMA242CDSC204STA449C(TGDSC),Dmax/VBXray(XRD).22.1LIFACLIFAC,3(2):(1),;(2)900~1250!C,,,;(3):fCaO,CaCO3,CaSO3,CaSO4,Ca(OH)2,CaSO3#xH2O,CaSO4#xH2O.CaSO3CaSO4,20%~25%,CaSO3#xH2OCaSO4#xH2O50%~55%.2LIFACTable2CompositionsofLIFACsulphurremovalflyashSulphurremovalprocessTemperature/!CSulphurremovalefficiency/%ReactionReactionproductLimestoneinjectionintothefurnace1250~90020~25Liquidflyashcooling,CaO,SO2andflyash,Flyash,CaCO3decomposition,CaO,CaCO3remainder,CaO(s)andSO2(g),CaSO3,CaSO4CaO(s)andSO3(g)Activationofcalciumoxide150~5050~55CaO(s)andH2O,Ca(OH)2,CaSO3#xH2O,Ca(OH)2(s)andSO2(g)CaSO4#xH2O2.22.2.11,LIFACCaO,SO3,fCaOIL.LIFAC,,SO3.SO3CaSO4,2.50%SO31.75%CaO,fCaO6.42%,5.52%CaO,.LIFACCaO,,,.SO3CaSO3,,CaSO3CaSO3CaSO420%.2.2.2TGDSC3805LIFACTGDSC1,,454!CCa(OH)2.0.5hTGDSC(2),454!CCa(OH)2.(3).,Ca(OH)2,fCaO.,80%40m900~1250!C,1~2s,CaO,CaO.,2778.5!C3873.5!C,CaCO3.2CaCO3,FTIR.1LIFACTGDSCFig.1TGDSCcurvesofLIFACFA2LIFAC0.5hTGDSCFig.2TGDSCcurvesofLIFACFAafterhydratingfor0.5hour3TGDSCFig.3TGDSCcurvesofJLFA3814:LIFAC2.2.3FTIRLIFAC4.Si∃O∃Si(1093.21,908.00cm-1),558.23,461.25cm-1.LIFACSi∃O∃Si,CO32-(1412.65,875.34cm-1),CaCO3().,LIFACOH-H2O(3645.50,3445.34cm-1)1633.89cm-1,OH-(Ca(OH)2),H2OH2O.4LIFACFTIRFig.4FTIRcurvesofJLFAandLIFACFA2.2.4XRD2XRD5.(A3S2)(SiO2)(Fe2O3)(Fe3O4),LIFAC,(CaCO3)(Ca(OH)2),TGDSC.,2220!~25!,,[2].2.2.5SEMLIFACSEM6.6,,,,.5LIFACXRDFig.5XRDpatternsofJLFAandLIFACFA6LIFACSEMFig.6SEMmicrographofLIFACFA38256LIFACC,O,Al,Si,Ca(7).(6A)O,Al,Si,3Al2O3#2SiO2(A3S2)(8)..6(B),(9)C,.6(C),S(10),CaSO4.6(D)C,O,Ca(11),CaCO3.76Fig.7EDSresultofFig.686Fig.8EDSresultofthewormsandblocksinFig.696Fig.9EDSresultofthesticksinFig.6106Fig.10EDSresultofthelittlecolumninFig.6116Fig.11EDSresultoftheflakesinFig.612Fig.12Opticalmicrographofgypsum(inorthogonalpolarization)2.2.6LIFAC,0.5~45m,3834:LIFAC.:,,,,(12);,,,4(13),(2~3)(14).13Fig.13Opticalmicrographofcalcite(insinglepolarization)14Fig.14Opticalmicrographofcalcite(inorthogonalpolarization)3LIFAC,.:2Si∃Al∃O(A3S2)(SiO2),(C);:LIFACCaCO3,fCaOfCaOCa(OH)2CaSO4,CaSO3.,LIFAC.:[1],.LIFAC[J].,2001,(1):712.[2],,.[M].:,1994.163.3845