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:1005-7854(2005)02-0059-04-(,430070):,1.0%1.2%,,-(),,2828N/,(+6.3mm)93%,(-0.5mm)3153%,FeO1%,:;-;;:TF046;TF03:ASTUDYONPROCESSPARAMETERSOFDRYINGANDPREHEATINGIRONOXIDIZEDPELLETSINGRATE2KILNZHANGHan2quan(SchoolofResourceandEnvironmentEngineering,WuhanUniversityofTechnology,Wuhan430070,Hubei,China)ABSTRACT:Inthispapertheprocessparameters,suchasbeddepthofgrate,gastemperatureofupdraughtdry2inganddowndraughtdrying,temperatureandvelocityofpreheatinggasinproductionofoxidizedpelletsthroughgrate2kiln,werestudiedbypreheatinggratesimulator.Self2producedmagnetiteconcentratesfromChengchaoMine,with1.0%1.2%ofbentonitebeingaddedasanadditive,wereadoptedinthestudy.Inthetest,beforepalletized,theconcentratewastreatedbydampmillingtechnology.Onthedryingandpreheatingconditionem2ployedinthisstudy,thecoldcompressionstrengthofthefiredpellet,afterdriedthroughthegrateandroastedinatestkiln,averaged2828N/P,thetumblerstrength(+6.3mm)wasabout93%,andtheabrasionindex(-015mm)was3.53%,FeO1%.Thefiredpelletrankedamongthehighgradeintermsofitsgoodquality.KEYWORDS:Oxidizedpellets;Grate2kiln;Preheatinganddrying;Beddepth:2005-01-09:,1-1,,,,,,,,2211,114220056MINING&METALLURGYVol.14,No.2June20051Table1ChemicalcompositionandsizedistributionofironconcentrateTFeFeOCaOMgOSiO2Al2O3SPCuNa2OK2O()/%67149271391136111631100178011901015010053011701121121/mm+01833018330137201372011750117501121011210109601096010740107401048-01044-01074/%012018414518614519201656187614:3153%,15153%,2165mm/min,0129,21172g/cm3,41608g/cm3,,,,,212,:SiO2CaOMgOAl2O3/%601001135311713137K2ONa2OS/%016001410103211165110%112%,:100g3015g,6910%,(2h)15510%,812mL/g,-01074mm9116%3,1000mm500mm6min,1000mm,,,,,1(150950)1Fig11Sketchmapofgratemodels441141111180200mm,160mm200mm160245mm2003min115m/s,4006min115m/s,95015min115m/s,,2160245mm,500N/,AC(-5mm)5%-,,2,,245mm,,AC(-5mm),200mm2Table2Influenceofbeddepthonqualityofpreheatedpellet/mm/(N-1)FeO/%AC-5mm/%1601280717631220096081453102306158140314245560919841241112200mm,4006min115m/s95015min115m/s,3,150250,,,AC(-5mm),,,,200063Table3Influenceoftemperatureofup2draughtgasonqualityofpreheatedpellet//min/(ms-1)/(N-1)FeO/%AC-5mm/%150311586081131420031158507193122503115600716312424min,500N/;3min,AC(-5mm)5%,4min,,3min4Table4Testresultsofdurationofup2draughtdrying//min/(ms-1)/(N-1)FeO/%AC-5mm/%20021011554010120518200215115787918051420031011586281403182004101151159817031841113200mm,2003min115m/s,95015min115m/s,(1)55Table5Testresultsoftemperatureofup2draughtdryinggas//min/(ms-1)/(N-1)FeO/%AC-5mm/%3006115920913421640061158628140318450611588012154416,300450,,300AC450,,,300400,400(2)646min,,4min,FeO,,,AC,6min6Table6Testresultsofdurationofdown2draughtdrying//min/(ms-1)/(N-1)FeO/%AC-5mm/%400410115850101524124005101158409156416400515115902815741240061011510628181318(3)7,,,,112115m/s7Table7Testresultsofairvelocityofdown2draughtdrying//min/(ms-1)/(N-1)FeO/%AC-5mm/%4006110117791312164006112102081962124006115862814731841241211,,Fe3O4Fe2O3,9001000,,,,FeO,10001100FeO,9001000,,,(8),950900,,AC614%,,16:-1000,,(FeO4129%),,,,,1200N/,AC,950,FeO(1187%),950412129615min15min,615min2500N/,2500N/,9217%9413%,(-5mm)5%,FeO1%,,10min41213,10min950,110115m/s(10),:112115m/s(),FeO,115m/s8Table8Testresultsofpreheatingtemperatureofthegrate//min/(ms-1)/(N-1)FeO/%AC-5mm/%/(N-1)+613mm/%-5mm/%/%FeO/%9001011575671646142455881851879913411899501011510576139310282893103153991530176100010115120341293102506901641969913211879Table9Testresultsofpreheatingdurationofthegrate//min/(ms-1)/(N-1)FeO/%AC-5mm/%/(N-1)+613mm/%-5mm/%/%FeO/%950615115873816151222028913415399142110795091011592581863152647921741009915301789501011510576139310282893103153991530176950131159857194312275593132170991730182950151151050719731228059413216799132018210Table10Testresultsofpreheatingairvilocityofthegrate//min/(ms-1)/(N-1)FeO/%AC-5mm/%/(N-1)+613mm/%-5mm/%/%FeO/%950101106521012151972407881951689914311879501011270141695120258590105101991781179950101151057612931002828931031539915301764121410min,,,,,41215,11%12%,FeO8%9%,,Fe2O3,413,11%12%,(12301280)15min,2828N/,(+613mm)93%,(-015mm)3153%,FeO0176%(89)2631711000g100mL,10mL(1+1),,,,5mL(1+1),50mL,,5:5(n=5)Table5Comparisonbetweenanalysisresultsandreferences(n=5)/%AlAsCdCuFePbSnTl1#01000320100015010003201000150100032010003201000320100016010004801000160100035010001801000410100041010004501000282#010070010052010070010040010062010069010069010051010078010049010067010045010069010069010069010052,,2#;1#,,318,66(n=5)Table6Accuracyandprecisionofthemethod(n=5)AlAsCdCuFePbSnTl/g(50mL)-1518311119117114213319214/g(50mL)-110101010101010101010101010101010/g(50mL)-115131411111911131111121913151118/%9511010096971069694RSD/%5158144186152168169121011:94%110%,216%1011%,4,;01999,112g/50mL,94%110%,:11[M]1:,1994,148-16112,1(I)[J]1-,2005,41(1):67-711(62)5(1):200230mm,:200,3min,115m/s;:400,6min,115m/s;:950,10min,115m/s,11%12%(2),,2828N/(+613mm)93%(-015mm)3153%FeO1%,:1,1[M]1:,2000,212-220.2,,,1-[A]12004[C]12004131[M]1:,1991198: