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2Figure2.1-BFSManufacturingProcess.Figure2.2-GBFSManufacturingProcess.Figure2.3-GGBFSManufacturingProcess.2.1BLASTFURNACESLAGBFS2.2GRANULATEDBLASTFURNACESLAGGBFS2.3GROUNDGRANULATEDBLASTFURNACESLAGGGBFSBFSisproducedwhenironoreisreducedtoironinablastfurnace.Moltenslagfromthefurnaceispouredintopitsandallowedtocoolinair.Rocklikemineralsareformedwhicharethencrushedandscreenedtoseparatethemintoaggregatesandsands.Aircooledblastfurnaceslagmaterialsaregreyvesicularrocksslightlylighterinweightthannaturalmaterialslikebasalt.GBFSisproducedwhenmoltenBFSisrapidlyquenchedbyaseriesofhighpressurehighvolumewatersprays.Theseconditionscausetheslagtosolidifybeforecrystallisationisabletooccurcreatingaglassymaterial.GBFSissimilarinappearancetoriversandwithadensityof60-70thatofnaturalsand.GGBFSisproducedwhenGBFSisgroundtocementpowdernenessinaballorverticalrollermillandhasano-whitecolouration.QuickReferenceGuide12013RoadsGuideSupplementonGeneralApplicationsFigure2.4-SFSManufacturingProcess.2.4STEELFURNACESLAGSFSSFSisaco-productoftheconversionprocessofmoltenirontosteelinabasicoxygensteelmakingshopwithinanintegratedsteelworks.Wheretheviolentreactionoccurswithinthevesselaftertheoxygenlanceisloweredaprotectiveslaglayerformswiththeadditionoflime.Whenthereactionhasbeencompletedthesteelandslagareseparatedandmoltenslagispouredintopitswheretheslagiscooledwithwatersspraysafterinitialsolidication.SFShasadarkgreycolourwithaparticledensitythatis20greaterthanbasaltandisdenitivelyharderthanBFS.Thisproductcrushesintoacubicalshapeandhasthepotentialforexpansionifnotadequatelyweathered.Weatheringistypicallyachievedbyperiodicwateringmonitoringandinternalstockpilemanagementprocedures.2.METHODOFMANUFACTURESlagisaco-productofallcommonsteelproductionmethods.Hereitformseitherthroughtheadditionofuxessuchaslimeorastheoxideportionofironore.Thereareanumberofdierentslagtypesproducedwhichisdependentonthesteel-makingprocessused.Table1outlinestypicalphysicalpropertiesofferrousslagproducedinAustralia.