简介:Theeffectofpressdirectiononthethermalexpansion,slagresistance,etc.ofpericlase-spinel-carbonbrickhasbeenstudiedinthisarticle.Theresultsshowthatthetherma1expansionrateinthedirectionparalleltothepressaxisislargerthanthatinthedirectionperpendiculartothepressaxisandtheslagresistanceinthedirectionparalleltothepressaxisismuchbetterthanthatintheperpendiculardirection.Thedirectionaldistributionofgraphiteinthespecimenisobservedwiththemicroscope.
简介:Henanprovinceisveryrichinrefractorymineralsofmanyvarietiesincludingsilica,dolomite,graphite,pearlite,sepiolite,olivine,andsillimanitegroupminerals,besidestheabundantreservesoffireclayandbauxite,whichlayagoodfoundationforthedevelopmentoftherefractoriesindustryoftheprovince.Thepaperintroducesthereserves,distributionandcharacteroftherefractorymineralsinHenanprovince.
简介:Theeffectsofseveralcommercialdispersants,includingAN-2000,ammoniumpolyacrylate,sodiumtripolyphosphate,sodiumhexametaphosphate,andofsolidsloadingandofelectro-fusedmagnesiaonrheologicalpropertiesofaqueousalumina-spinelslurrieswerestudied.TheresultsrevealthatAN-2000isthemosteffectiveoneamongtheselecteddispersantsforalumina-spinelslurries.With0.5%weightofAN-2000,the57vol%solidsloadobtainedatshearrateof50s-1.
简介:ThecomplexcoatingontheMgO-CaOclinkerwaspreparedbydippingmethodandaddingthesecondmineraltorestraintheformationandexpansionofthecracks.Meanwhile,thericrostructureandthemorphologyofthecoatingandhydrationresistanceoftheMgO-CaOclinkerwerealsoinvestigated.TheresultshowsthatthecoatingconsistsmainlyofCa2P2O7,MgOandCaCO3,itsthicknessrangesfrom5μmto20μm,andthecoatingisdenseandeven,nomicro-cracksareobserved.Also,thecoatingadherescloselytothematrix.ThehydrationresistanceoftheMgO-CaOclinkeraftertreatmentisimprovedgreatly,andthecastablespreparedwiththetreatedMgO-CaOclinkerhavebetterphysicalpropertiesthanMgOcastable.
简介:Lowcement(LC)andultra-lowcement(ULC)bauxite-SiCcastablesareimportantandhighperformancemonolithicrefiactoriesandtheyhavebeenwidelyusediniron-makingandincineratorlinings.Inthiswork,rheo-logicalbehaviorofLCandULCbauxite-basedSiC-contain-ingcastableshasbeenstudied,includingtheeffectsofSiCcontentandcementcontentonrheologicalpropertiesofthecastables.TheresultsshowthatwithanincreaseofSiCandcementcontent,rheologicalpropertiesofthecastablesdeteriorate.Ontheotherhand,moderateamountsofSiC(4%~8%)andofcalciumaluminatecement(2%~4%)haveveryslightinfluenceonrheologicalproperties,(i.e.whenthecastablesareshearedtheirtorqueandyieldtorqueonlyslightlyincreasewiththeshearingspeed).Therheologicalcharacteristicsofthecastablesfol-lowBinghamfiuidandalwaysshowshearthinningbehav-ior.
简介:Theliningofblastfurnacemaybedamagedpartly,sothatgunningrepairisneeded.Thebondingstrengthofboundarysurfacebetweentherepairinglayerandremainedliningofblastfurnacehasbeenstudiedbythermalsimulation.Thefactorsinfluencingthebondingstrengtharetheingredientgunningrepairtemperature,remainedliningconditionandwatercontentofgunningrefractory.Thebondingstrengthdecreaseswiththeincreasesofremainedliningtemperature.
简介:Inthispaper,X-raydiffractogramanalysisandSEMobservationofAl4C3formedathightemperaturefromcarbon-containingrefractorieswithAlhavebeencarriedout.Aluminumaddedtocarbon-containingrefractoriesreactswithC(s)toformAl4C3(s)graduallyduringheatingfrom600℃to1200℃.ItisconsideredthattheinterlockedstructureofAl4C3platecrystalspromotestheoutstandingincreaseofhotmodulusofruptureofcarbon-containingrefractorieswithAl.TheHMORofcarbon-containingrefractoriesaddedwithAladditivefrom0to5wt%increasesby2.8timesbeingfrom6.5MPato18.2MPa.AfterathermochemicalcalculationforhydrationreactionprocessesofAl4C3andH2O(g),theequilibriumpartialpressurechartofH2O(g)inH2O-Al4C3-Al(OH)3systemvsvarioustemperatureshasbeenattained.TheH2O(g)partialpressureintheairneededfortheAl4C3hydrationreactionisnomorethan10~18atmatthetemperaturebelow120℃.Itisconsideredthattheburnedcarbon-containingrefractorieswithAlisextremelyeasytohydrateandthecrackingofburnedcarbon-containingrefractoriesisgeneratedbecausethatthehydrationexpansionis2.11timesduringtransformingfromAl4C3toAl(OH)3.ThefundamentalmeasureagainsthydrationoftherefractoriesistoinsulatetherefractoriesfromH2O(g)byvariousmeanssuchaspitchimpregnationorothersealingmaterials.
简介:Inordertomeettheneedsofhotrepairingtechnologyofcokeoven,thezeroexpansionsilicabrickwithsuperpropertieshasbeendeveloped,andtheproblemofpoorthermalstabilityofcommonsilicabrickhasbeenovercomned.Thisproductcanbedirectlyusedafterbeingrapidlyheatedafterconstruction.Atpresent,ithasbeenappliedincokeovensinItalyandBaosteel.