Page 1
Page 2
Page 3
Page 4
Page 5
Page 6
Page 7
Page 8
Page 9
Page 10
Page 11
Page 12
Page 13
Page 14
Page 15
Page 16
Figure2.5-EAFSManufacturingProcess.Table2-QualityAssurancePrinciples.345672.5ELECTRICARCFURNACESLAGEAFS2.6LADLEFURNACESLAGLFS3.TYPICALCHEMICAL2.7CURRENTSTANDARDSRefertoFigure2.5forthediagramofthemanufacturingprocess.LFSisaco-productoftheLadleMetallurgyFurnaceLMFprocesswhichisthereningprocessofliquidsteelsourcedfromtheEAFbutpriortocasting.AftertheEAFSprocesshasoccurredseeFigure2.5andmostoftheEAFSremovedtheliquidsteelistappedfromtheEAFintoaladle.TheladleofliquidsteelisthenalloyedattheLMFtoachievetherequiredchemicalspecications.AfterspecicationisachievedtheliquidsteelispouredoutduringcastingandtheremainingLFSisretainedtobepouredoutseparatelycooledandthenreprocessedtorecovermetallics.ThecompositionofLFSvariesdependingontheEAFladlefurnaceprocessingconditionsandthetypeofsteelgradebeingproduced.QualityassuranceprinciplesasseeninTable2areinplacetoensurethesupplyofhighqualitysafereliableanduniformISSproductstothemarketplace.Underthesestandardsslagproductsareusedtosubstituteorsupplementnaturallywonmaterialstomaximizenaturalresourcesustainabilityminimisewastetolandllandimproveconstructionandmanufacturingprocesses.Asthemoltenslagisproduceditistappeddirectlyintoadjacentpitsandbeginstosolidifyinair.Thisproductthenundergoesafurtherrenementprocesstoremovetheresidualmetallicsandremainingslagwhichisthenseparatedintovariousproductstreams.Asaco-productofthesteelmakingprocessEAFSisproducedinanelectricarcfurnace.IntermsofitsphysicalappearancetheslagisdarkgreyincolourandharderthanBFSwithaparticledensityof20-25greaterthanbasalt.Thisproductcrushesintoacubicalshapeandhasthepotentialforexpansionifnotadequatelyweathered.Weatheringistypicallyachievedbyperiodicwateringmonitoringandinternalstockpilemanagementprocedures.ApplicationPrincipleRoadBaseHeavilyBoundNSWRMSR73andvariousCouncilspecicationsUnboundRMS3051AustroadsARRBSR41andvariousCouncilSpecicationsSelectFillNSWRMS3071andvariousCouncilspecicationsGeneralFillRMSR44andvariousCouncilspecicationsFill3QuickReferenceGuide12013RoadsGuideSupplementonGeneralApplicationsTable3-TypicalChemicalCharacteristics.8ThetypicalchemistryofBFSSFSEAFSandLFSafterappropriateconditioningandweatheringisshowninTable3below.AllISScomplywiththenecessaryguidelinesfortheirchemicalcomposition.ConstituentsasOxidesSymbolBFSSFSEAFSCalciumOxideSiliconOxideMagnesiumOxideAluminumOxidePotassiumOxideVanadiumOxideSulphurChromiumOxideTitaniumOxideMagnesiumOxideIronOxideFreeLimeCaOSiO2MgOAl2O3K2OV2O5SCr2O3TiO2MnOFe2O341356.5140.3