极细颗粒土比表面积测试与分析

极细颗粒土比表面积测试与分析

地板、midle、midle、slitoply、slitoply、slitoply、slitoply、slitoply、slitoply、slitoply、slitoply、slitsim和椰子市长：。Intheviewofsoilmineralogy,solid-phaseingredientsofsoftclaycanbedividedintoclayminerals,nonclayminerals,organiccompounds,andsoon.Claymineralspossesstiny-particlescaleandlargeSSA,asaresult,thephysicochemicalandwater-electrolyteinteractionarequitesignificant.Andnon-claymineralscanberegardedasinertmaterial,hencetheessenceoftheirreciprocitybelongstophysicalactionManyliteratures1es鞣orptionmethodLaboratorytestofSSAmainlyincludesadsorptionmethod,calculationmethodandinfiltrationheatmethod,whereadsorptionmethodiswidelyused1.1u2004相关内容Inpreviousliteratures,particularnaturalsoilisusedasexperimentobject,suchasshale,Lousoil,aquicbrownsoil,yellowreddle,yellow-redsoil,andsoon.Theexpenseformineralcompositionanalysisofnaturalsoilisquitehighbecauseofitscomplexingredients,furthermore,itisalmostimpossibletoisolatetheinfluenceofanysingleingredient,thustheeffectsofmineralcompositionontestresultsareusuallyconfinedtoqualitativeandsemi-quantitativeanalysis.Theartificialsoilcanbepreparedassingleingredientormultiingredientscomposedofseveralpuremineralsaccordingtodesignedproportions,henceeverymineralisspecificiningredientandexactinquantity,anditisconvenienttomeasuretheparameterssuchasSSAandsurfacechargedensity,agreatdealofexpenseformineralcompositionanalysisissaved.AsapreliminarydiscussionforSSAoftiny-particleclay,artificialsoilisadoptfirsttocarryonSSAtest,thenthecomparativeanalysisismadewithShenzhensoilandKuwaitsoilofwhichmineralcompositionsareknown,andthenSSAestimationofnaturalsoilmentionedaboveismadeaccordingtotheiringredients.Where,WWW1.3体格检查1.3.1ptifptifficiump和ptifgviumsotga生长BETmethodbelongstocommongasadsorption,andithasbeenlistedininternationalandnationalstandardsatpresent.Themainprincipleis,whenplacingingassystem,physicaladsorptiontakesplaceonthematerialsurfaceofsample(includingexternalsurfaceandinternalholesurfaceofparticles)atlowtemperature.Bymeasuringequilibriumadsorptivepressureandadsorptivegasvolumewhenadsorptionreachesequilibriumlevel,monolayeradsorptivevolumecanbeobtainedaccordingtodiagrammethodorlinearregressionmethodfromequation(2),andtheSSAvalueisgained.Where,P—nitrogenpressure(Pa);PV—equilibriumadsorptivevolume(cmC—BETconstant;VFig.2showstheSSAtestinstrumentproducedbyBeijingAnalysisInstrumentCompany.Inordertoremovephysicallyadsorptiveimpuritiesfromparticlesurface,allsamplesaretreatedbyvacuumdegasificationbeforetest.Whengaspressure,compositionandsampleweightreachstability,experimentshouldbeginattestingtemperature.Ingeneralcase,thevalueCisrelativelyhighinBETequation,especiallywhennitrogenisutilizedasabsorptivegas.Therefore,testingefficiencycangreatlybeimprovedbyusingsinglepointmethod,andthedeviationofresultsislessthan5%usuallycomparedwithmulti-pointmethod.RelativepressureP/Pwhere,m—sampleweight(g).1.3.2测试试剂BETmethodisadoptedtocarrySSAtestonsampleS1—S42.2通过外在法律和环保目标来解释cryrageofvacuuming、method和coligact.u.methodAlthoughbothEGMEandBETmethodarecommonlyused,testresultslistedinTable4andTable5aregreatlyinfluencedbytestmethods,wherethegapscanreach11,7.3and2.4timesforbentonite,quartzandfeldsparrespectively,exceptforkaolinite.Generally,BETmethodissuitableforexternalSSAtestofclayminerals.Atthestageofvacuuming,dehydrationandconstrictionofcrystallayerinclaymineralpreventnitrogenfrominfiltratingintointernalsurfaceofcrystallayer,andthegasisadsorbedonexternalsurfaceonly.Asaresult,onlytheexternalSSAismeasuredbyBETmethod.WhendryinginEGMEorglycerolsolution,polarmoleculecanbeabsorbedonbothinternalandexternallayerofexpansiveclaymineralsuchasmontmorillonite.AsaresultofX-raydiffraction,thespacingofinternallayerremainsunchangedafterabsorption.Monolayerofpolarmoleculeamonginternallayerinmontmorillonitecanbekeptforarelativelylongtimewhenexcessamountofpolarmoleculeisevaporated.ThetotalSSAisobtainedbymeasuringtheamountofadsorptivepolarmoleculeandutilizingconversionfactor.Hence,EGMEmethodissuitableforSSAtestofgeneralclayminerals.Quartzandfeldspararenon-clayminerals.ThemainingredientoftheformerisSiO3whicholgachingsp..3日h......3日着色人的树期树,.........................................3.3.3h.............3.AccordingtoSSAtestandcorrespondinganalysisontiny-particleclayofdifferentmineralcompositionandcontent,thefollowingconclusionscanbemade.(1)TheSSAofclaymineralismuchmorehigherthannon-claymineralbecauseofthelayeredstructure,wherethesurfaceareaofbentoniteislargerthankaolinite,andquartzisclosetofeldspar.(2)MineralcompositionandcontenthavegreatinfluenceonSSAoftiny-particleclay.TheSSAvalueincreasesrapidlywiththeaugmentationofbentoniterelativecontent.(3)Byneglectingtheinteractionsofingredientsinnaturalsoil,thetotal(external)SSAvalueapproximatelyequalstothesummationofcorrespondingvaluesofitsowningredient.(4)EGMEmethodissuitablefortotalSSAtestofclayminerals,andBETmethodcanbeappliedtoexternalSSAtestforclaymineralsaswellasSSAtestfornon-clayminerals.EitherEGMEorBETmethodcanbeappliedforkaolinite,whichownshardlyanyinternalSSA.Theartificialsamplesusedintestsaremadeofhigh-purityultrafinepowderthatincludebentonite,kaolinite,quartz,feldsparandartificiallymixtureswhicharemixedatcertainratiosbydrymassoffouringredientsmentionedabove.IngredientandaverageparticlesizeofartificialsamplesaregiveninTable1.ThenaturalsamplesusedintestsincludesShenzhenandKuwaitsoil.ThemineralcontentsandproportionsareshowninTable2.Inthesetests,12groupsofsamples(S1—S11,S13)aretestedbyEGMEmethod,eachgroupismadeupof3identicalsamples.5groupsofsamples(S1—S4,S12)aretestedbyBETmethod,andthereis1sampleforeachgroup.Allsamplesarekeptinthermostaticdryingchamberforover6hoursat106℃beforetest.1.2u2004范围TheprincipleofEGMEmethodisturningpolarorganicmolecules(suchasglycerol,ethyleneglycol,EGME,ethyldiaciddibromide,etal.)intomonolayersoastoadsorbonsurfaceofclayparticles.ThentheSSAcanbeobtainedaccordingtoweightandsizeofReagentsandinstrumentsusedintestarelistedinTable3,andeveryapparatusisconnectedbyhighqualityrubberhose.Fig.1showsthewholeviewofvacuumdryinginstrumentswheretwogroupsofsamplesareplacedrespectivelyatthesametime.Toavoidairleakageandensurevacuumdegree,sealingperformanceofeachinstrumentshouldbecheckedcarefullybeforetest.BriefprocedureofEGMEmethodisasfollows,thesamplesaredegassedanddriedrepeatedlyuntilconstantweightatfirst,then3mLEGMEisaddedtoeachsamplebydropping.AfterevaporatingtheexcessamountofEGMEinvacuumdryer,theconstantweightofsamplecanbemeasured,thentheSSAvalueS1.2.1内皮和附加件1.2.2rra介绍EGMEmethodisadoptedtocarrySSAtestonsampleS1—S11andS13fromTable1andTable2.ResultsarelistedinTable4.2u2004范围2.1EffectsofMineralCompositiononSSATheSSAoftiny-particleclayisrelatedtocomposition,anddifferentcompositionmakesgreatdiversityinSSAvalue.HencemineralcompositionisthemainfactorthatinfluencesSSAvalueoftiny-particleclay.TherelationshipbetweenSSAvalueandbentoniterelativecontentofsampleS5—S8,S9—S11isshowninFig.3(a)andFig.3(b),wheresolidpointsstandformeasuredvaluesandhollowpointsstandforestimatedvaluesthatobtainedfromoverlayingmeasuredvaluesofsingleingredientproportionally.Fig.3indicatesthatmineralcompositionhasgreatinfluenceonSSAoftinyparticleclay.TheSSAvaluesincreaselinearlywiththeaugmentationofbentoniterelativecont