Application of Semi—rebonded Magnesite—Chrome Bricks of LRCO at RH Lower Vessl of NKK Keihin Works-中国期刊网

摘要 TheapplicationresultsofSemi-rebondedMagnesite-ChromebricksatRHlowervessloftheNKKCorporationKeihinWorkshavebeenanalysed.Theresultsindicatethatthemainreasonsthatcausethedamageoftherefractorybricksincludechemicalat-tackofslagtotheSemi-rebondedMagnesite-Chromebricks;penetrationofmoltensteelandslagnintothebricks;andthermalspallingduetoteperaturefluctuationduringsteelmakingoperation.There-sulitsofmultipleeffectionofthesefactorsleadtoalternativeactionoferosion(chemiclattackandpenetration)andspalling(thermalspallingandstructurepeeling)resultinginthedamageofthebrick,Inordertoimprovetheperformanceofthebricks,itisnecessarytopromotetheresistancetoero-sionandthermalshockresistanceaswellastokeeptheauratedimensionsofthebrick.Themeasurestoimprovetheresistancetoerosionofmagnesite-chromebrickstakenbytheresearchersmainlyin-clude:loweringthecontentsofimpuritiesinthebricks(mainlyincludingSiO2,CaO,andnextFe2O3andAl2O3);promotingtheextentofdirectbondofthebrick;formingalargeamountofmagnesia-chromecompositespinelwell-distributedinthebricksthroughaddingalargeamountofsynthe-sizedmaterials;enhancingtheresistancetoerosionbyaddingalittleamountofhigh-effectiveaddi-tives,Improvementofthermalshockresistanceofthebricksismainlythroughintroducingsomeaddi-tivetomakeacertainamountofmicro-cracksoccur-inginthebricksoastoobtaintheeffectofincreasetoughnessorthroughformationofsecondhightem-perturesolidphseinthebrickbyadoptingaddi-tive,Inddition,itisneededtoimprovethequalityofthebrickappearanceandensureaccuratedimen-sionsofthebrick,Thepurposeofthispaperistodescribethefurtherimprovementoftheservicelifeofrefactorybrickbythemeasurestakenonthebasisofthenalysisresultstotheusedbricks.

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Application of Semi—rebonded Magnesite—Chrome Bricks of LRCO at RH Lower Vessl of NKK Keihin Works

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Application of Semi—rebonded Magnesite—Chrome Bricks of LRCO at RH Lower Vessl of NKK Keihin Works

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