学科分类
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96 个结果
  • 简介:1ProductionandRunningStatusoffChina’sRefractoriesIndustryin2012____________________________1.1RefractoriesOutputIn2012.China’srefractoriesoutputwas28.189milliontonsdecreasingby4.43%YOY,inwhichtheoutputsofdenseshapedrefractoryproducts,insulating

  • 标签: 耐火材料 运行状态 材料行业 中国 生产 耐火制品
  • 简介:Thehydrationoftricalciumaluminate(C3A)hasasignificanteffectontheeffectivenessofcement-basedsystems.Inaddition,thecarbonationofhydrationproductsofC3Aisparticularlyimportantinrespectofdurabilityperformance.ThepresentworkinvestigatesthehydrationandcarbonationreactionsofC3AandthechangesinducedbythepresenceoftheheavymetalionssuchasZn2+,Pb2+,Cu2+andCr3+byX-raydiffractometry(XRD).DuringhydrationofC3A,gehlenitehydrate,hydrogarnet,calciummonoaluminate(C4AHx)andcalciumcarboaluminateweredetectedinC3ApastesexcepttheZn2+dopedpaste,wherehydrogarnetdidnotform.Theexaminationsrevealedthatheavymetalscoexistedwithgehlenitehydrate,calciummonoaluminate(C4AHx)andcalciumcarboaluminate,inhibitingtheformationofhydrogarnet.HydratingC3Awasliabletobecarbonatedonexposuretoairandcarbondioxide,especiallyinthepresenceofheavymetals,resultingintheformationofcarboaluminateand/orcalciumcarbonate.Thepresenceofheavymetalsin-fluencedthepolymorphismofcalciumcarbonate,ndicatingthatheavymetalscouldco-precipitatewithcalciumtoformacarbonatesolidsolution.

  • 标签: 三钙铝酸盐 水合作用 碳酸化作用 重金属 XRD 耐火材料
  • 简介:Chinahaslongbeenrecognisedasanimportantsourceofrefractoryrawmaterialsforrefractorymarketsworldwide.Bauxite,magnesia,fusedalumina,andrefractoryclaysinparticular,havemaintainedChina'sstrongpositionastheworld'sleadingsupplieroftheseminerals.However,importantchangeshavetakenplaceirthestructureofChineseandglobalsupplyoftheseminerals.Moreover,theworldrefractorymarketandthemineralstradingsectorhavealsoundergonearadicaltransformationthathasinfluencedmineralsupply,andshiftedendproductmanufacturetoChina.ThispaperhighlightsthesechangesandseeshowtheyhaveimpactedonChinaasaworldsourceofrefractoryminerals.

  • 标签: 瓷器 原料 耐火材料 矿石市场 世界 市场供给
  • 简介:Thedevelopmentofefficientbondingagentsisoneaspectoftheadvancementofrefractories.Basedonanewlydevelopedbindersystem,anewgenerationoftar-resinbondedmagnesiacarbonproductswithhighperformancehasbeendeveloped.Furthermore,thebindersystemcharacterizedbyhighcarbonyieldaftercarbonizationresultsinforminganextremelystrongcarbonbonding.Itcanimproverefractoriespropertiestogetnewproductwithmoreadvantagesthanoldrefractories:moreeconomic,lowercostandlowtoxicity.Tar-resinisnotonlyusedinshapedrefractories,butalsoinmorerefractoriestypes,suchasmonolithicrefractories.ImmersionexperimentsofMgO-Cmonolithicrefractoriessamplesinliquidsteelat1600℃havebeencarriedoutforsteelmakingindustry.TheseexperimentsshowedtheformationofadenseandcontinuousMgOrichlayer,ontheinterfacebetweenrefractoryandsteel,andthepossibleformationofinclusionsaslargeclustersprotrudingfromtherefractorysurface.Forthemechanicalproperties,thepowderwasheatedupto1400℃inairtoremovecarbon,andwassubsequentlyformedintobrickshape.StandardASTMwasusedtodeterminetheMOR,porosityanddensity.Itisfoundthatantioxidantmaterialsplayanimportantroleinimprovingthemechanicalproperties.

  • 标签: 金属抗氧化剂 氧化镁-碳 单片电路 耐火材料 焦油 树脂
  • 简介:MobarakehsteelCompanyproduces3milliontonsofsteelannuallywitheight180tonsEBTfurnaces.Differenttypesofmagnesia-carbonrefractorieshavebeenemployedatslaglineduringlast5years.InthepresentstudythewearandcorrosionofMgO-Crefractoriesofthesefurnaceshavebeenstudiedviapost-mortemanalysisofusedbricksandtheobservationofoperationaleffects.Laboratorycorrosiontestswerealsoarrangedtoinvestigatetheeffectofslagchemistryandthemechanismofchemicalcorrosion.Characterizationofdifferentmagnesia-carbonbricksclarifiedthatthecrystalsize,typeandchemistryofmagnesiaaswellasgraphitestructurehavethemaininfluenceoncorrosionresistance.TheCaO:SiO2ratioinslagalsoplaysavitalroleinthewearofslaglinerefractories.Theironoxidecontentofslagalsohasamajorroleingraphiteoxidation.Ofmetallurgicalparameters,theelectricpowerinputandthecontacttimehavegreatinfluenceonrefractorieslife.TheresultswillbediscussedwithemphasisonparticularoperationalfactorsinMobarakehsteelplant.

  • 标签: 耐火材料 MGO-C 氧化镁-碳砖 炼钢 电弧炉
  • 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.

  • 标签: 碳化铝 水合作用 耐火材料 SEM 热化学分析
  • 简介:EffectsofAl—Siadditiononhotmodulusofrupture(HMOR),thermalshockresistance2MPato21-29MPaat1400℃.AlandSiadditiontolow-carbonMgO-CmaterialsalsoimprovesTSR-.residualstrengthratioafterthermalshockwhenAT=1200℃isincreasedfrom44%to73%-77%.AlreactswithCandN2toformAl4C3andAlN:SireactswithCtoformSiC.Ultimately,in-situformednonoxidesincreaseappreciablywithtemperaturerisingandarewellinterlacedinpericlaseskeletonstructureat1300-1400℃.whichisbeneficialtothermomechanicalproperties.

  • 标签: 低碳MGO-C砖 热力学性能 材料 元素 骨架结构 AL4C3