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1、直接还原铁技术现状（Statusofdirectreductionirontechnology）StatusofdirectreductionirontechnologyDirectreductionofironisironoreinthesolidconditionfordirectreductionofiron,canbeusedashigh-qualitysteelspecialsteelsmelting?Thepurerawmaterial,butalsocanbeusedascastironalloy??ironconta
2、iningrawmaterialpowdermetallurgyprocess?Thisprocessnocokeironmakingrawmaterialisusedwithoutcoldpressedpelletsinter,itisahighqualityandlowconsumption??newironmakingtechnologyoflowpollution,cutting-edgetechnologyoftheworldironandsteelmetallurgy?Directreductionironmakingp
3、rocesswithgasmethodandmethodoftwokindsofcoal,accordingtothemainequipmentcanbedividedintoverticalfurnace?Therotarykilnbottomrotaryfurnace??reactiontank?Tankfurnaceandfluidizedbedmethod?Atpresent,theworldismorethan90%ofthedirectreductionofironbygasproductionmethodbutnatu
4、ralout?Gasprices,limitedresources?Theproductionamountoffastgrowth?Usingcoalasreducingagenthasalsobeeninthetechnicalclearance,canuseorepelletsorpowder?Ironoreasrawmaterials(suchasfluidizedbedfurnace??rotaryhearthfurnaceandrotarykiln?But,becauseoftherequirementofrawfuelc
5、onditions(highironorethegradeishigherthan66%andlessthan3%Si02+A1203containingimpurities,coalash,etc.)tosmallscale,lowequipmentlife,duetohighproductioncostandsometechnicalproblems,resultinginthedirectreductionofironproductionhasnotbeendevelopedrapidlyintheworld?Therefor
6、e,theblastfurnaceironmakingproductionprocessisstillforalongtimeDominantposition?QualityrequirementsfordirectreducedironDirectreductionironisagoodrawmaterialforsmeltinghighqualitysteelinelectricfurnace,soitrequireshighquality(includingchemicalcompositionandphysicalprope
7、rty),andthequalityoftheproductisuniformandstableThechemicalcompositionof1.?Thedirectreductionofironcontentofironshouldbe>90%,themetallizationrateof>90%?SiO2containinga1%increaseto2%oflime,slagincreased30kg/t,electricpower18.5kWh?So,fordirectreductionofironrawmaterialsf
8、orirontohighgrade:>66.5%magnetichematite.Theironoregangue>67.5%,(Si02+A1203)<3%~5%?Directreductionironmetallizationra
