简介：

简介：

简介：Althoughhigh-performancebasicrefractorymaterialsplayanessentialroleinstate-of-the-artsteel-making,magnesiacastableshavenotbeenwidelyuseduntilnow.Amajorchallengeisthatbruciteformation(Mg(OH)2)duringMgOhydrationcausesvolumeexpansionandsubsequentcracking—aphenomenoncommonlycalled"slaking".Toovercomeproblemsrelatedtoslaking,anewspecialtyproduct,SioxX-Mag,hasrecentlybeendevelopedforcement-freeMgOcastablesbasedonMgO-SiO2-H2Obond.Specimensfromindustrial-scale-sizedblocksafterdry-outwerecharacterisedbySEMandXRDtechniques.UsingSioxX-Magincombinationwithmicrosilica,crackingcausedbybruciteformationissuppressed.Theresultsdemonstratethatthedosageofmicrosilicaplaysessentialrolesinthecrackformationinlargesamples.Furthermore,thecompatibilityofSioxX-Magwithdifferenttypesofbasicaggregates,mediumtohigh-gradedead-burnedmagnesiaandolivine,hasalsobeenevaluated.High-performance,self-flowingcement-freeMgOcastableshavebeendeveloped.

简介：

简介：Insomesteelmakingworkshops,theexistedinherentweaknessesoftraditionalcarboncontainingbrickworkinglining,suchasjointopening,verticalcrackingoflining,andexcessiveerosionofbrickedge,madeithardtosatisfythedemandsofadvancedsteelproduction.Anew-typecarbonfreecorundumspinelbrickandcastableweredevelopedbasedonthematrixoptimizedanalysis,successfullyappliedforultra-lowcarbonsteelproduction.Theadvantagesofthenewlydevelopedcarbonfreeworkingliningaremainlyasfollows:1)theinherentweaknessesofjointopening,verticalcrackingoflining,excessiveerosionofbrickedge,etc.aresurmountedsuccessfully,whichimprovestheoperationalsafetyofladles;2)theoutertemperatureoftheladleshelldecreasesby45-50℃comparedwiththatofthetraditionalcarboncontainingbricklining;3)theservicelifeofnew-typeworkingliningis150-170heats,nearlydoublingthatofthetraditionalcarboncontainingbricklining;thespecificconsumptionofrefractoriespertonsteeldecreasesbyabout20%;4)thecarbonpickupofmoltensteelisnotobviouswhichismerely5-10ppm,whichsatisfiesthedemandsoflow&ultralowcarbonsteelproduction.