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1、-AbstractWiththedecreaseintheamountofhighrankcoal,lowrankcoalisbeingincreasedtheuseofintheworldThehighmoisturecontentoflignite,however,significantlyconstraineditsvalue.Studyofmoistureinlignitecanprovideatheoreticalbasisforitsdehydrationtechnology.Inthisstudy,th
2、reeapproachesthatweretubefurnacedewateringinnitrogenatmospherecombinedwithDifferentialScanningCalorimetry(DSC),acceleratedsolventextractiondewateringapproach,andacceleratedsolventextractiondewateringapproachpretreatedwithmicrowavewereusedtodeterminetheformsofwa
3、terinShenglilignite.Furthermore,somephysico-chemicalpropertiesincludingfunctionalgroups,specificsurfaceareaandporesizedistributionofallsamplesweredetermined.Toinvestigatetheeffectsofcationsonequilibriumadsorptionwatercontentoflignite,ion-exchangeprocesswaschara
4、cterizedbyFourierinfraredspectrum(FT-IR)andtheashcontents.Theequilibriumadsorptionwatercontentsofallsamplesweredeterminedinarangeofrelativehumidities.Resultsofthesethreedewateringapproachesshowthatclassificationofwaterinligniteinvolves:freewater,non-freezablewa
5、ter,crystalwater,pyrolysiswater,closedporewaterandboundwaterincludingcapillarywater,inter-particlewater,intra-particlewaterandadhesionwater.Effectsofthesethreedewateringapproachesonphysico-chemicalpropertieschangewithoperatingconditions.Studyoftheeffectsofcatio
6、nsonequilibriumadsorptionwatercontentoflignitehasshownthattheextentofion-exchangedexchangeinShenglicoalisinorderof
Ca2+>Na+>K+>Mg2+.Therelativeeffectivenessofcationsinincreasingthe
equilibriumadsorptionwatercontentisinorderofMg2+>Ca2+>Na+≈K+.Athigh
relativehumi
7、dity,thefactorthatcontrolequilibriumadsorptionwatercontentisfree
watermoleculesinteractions.However,atmiddlerelativehumiditycapillaryforce
betweenmetalcation-carboxylgroupcomplexandcapillaryismoreimportant.Atlow
relativehumiditywaterinteractionswithsorptionsite
8、swhicharecation-carboxyl
groupcomplexbecomemoreimportant.Keywords:lignite；formofwater；metalions；wateradsorptioncapacityion-exchangedII----万方数据----目录摘要.......................
