红土镍矿直接还原焙烧磁选回收铁镍

32620106JournalofUniversityofScienceandTechnologyBeijingVo.l32No.6Jun.2010曹志成孙体昌杨慧芬王静静仵晓丹,100083,.,,.:,15%;KD2,20%;1200;40min.1083%5287%8215%5459%.X(XRD)(TEM).KD2,;,.;;;;TF80267RecoveryofironandnickelfromnickellateriteorebydirectreductionroastingandmagneticseparationCAOZhicheng,SUNTichang,YANGHuifen,WANGJingjing,WUXiaodanKeyLaboratoryoftheMinistryofEducationofChinaforHighefficientMingandSafetyofMetalMines,UniversityofScienceandTechnologyBeijing,Beijing100083,ChinaABSTRACTByaddingafluxandusingadirectreductionroastingandmagneticseparationmethod,ironandnickelenrichmentfromrefractorylowgradenickellateriteore,inwhichnickelismainlycontainedinsilicates,wasstudied.Bettertechnicalindicatorswereobtainedbyaddingtheflux.Theoptimalconditionsarecoalasthereducerwithadosageof15%,KD2asthefluxwithadosageof20%,androastingat1200for40min.AconcentrateoftheNicontentof1083%andtheFecontentof5287%,withtheNirecoveryof8215%andtheFerecoveryof5459%,wasproducedundertheoptimalconditions.TheactionmechanismsofKD2andcoalwerealsoinvestigatedbyXRDandTEM.TheresultsshowthatKD2canreactwithquartzandsilicatescontainingN,ileadingtoreleasingNifromthequartzandsilicates.Anoverdosageofcoalinthereductionroastingprocesscanresultintheformationofpureiron,incompanywithadecreaseinnickelrecovery.KEYWORDSnickellaterite;flux;directreduction;roasting;nickelsilicate:20090727:(1974),,;(1958),,,,Emai:[e-mail],,,[1].,[23].,70%,65%~70%,,,,.,,1%[4].,,[5].,,.6:[67],,[8];,.,,[9].2%,,,KD2,.111().,,186%,1359%.:SiO2436%,MgO527%,Al2O3274%.1,,.6893%,5183%,.1Table1ChemicalphaseanalysisofnickelandironintherunofmineNiFeNiFeNiFe/%0556201226671771287/%3107481768935183100001000012-2mm;,KD2.[1011].:KD2(),[1213]..,.2,,,5%,60%.,KD2,KD2.215%KD230%40min-0074mm95%200kA!m-1,1.,,,1200,915%,8556%;7163%,9118%.,,.1200.1Fig.1Effectofroastingtemperatureonthedirectreductionroasting2KD2Fig.2EffectofKD2dosageonthedirectreductionroasting22KD21200KD2,2,.,,,KD25%,442%,KD230%,95%..,KD220%,!709!32KD2.,KD220%8769%,KD220%.231200KD220%,3.,,,,;,20%,30%,3694%4685%.3Fig.3Effectofcoaldosageonthedirectreductionroasting,,,.,,,15%.,40min,40min.24:15%,KD220%,1200,40min.,.,,1-0074mm80%,2-0043mm95%.,,200kA!m-1.,:1403%,1083%,8215%,5287%,5459%,.3KD2,X.31KD2XA(Fe,Ni);BMg2SiO4;CFe064Ni036;DSiO2;EMg3-x[Si2O5](OH)4-x;FFe2O3;HC4KD2XFig.4XRDpatternsofroastingproductsobtainedwithdifferentKD2dosages4KD2X.:15%,1200,40min,KD25%10%15%20%30%.,.4,(D)(E)(F).KD2,(A)(B)(C).,KD2,,(A)(C),,,,.5KD220%.,KD2,().5(b)5(a)1,.!710!6:5KD220%(a)(b)Fig.5Electronmicroscopephotograph(a)andenergydispersiveanalysis(b)oftheroastingproductobtainedwith20%KD232X6KD220%,5%75%15%20%30%X.6,KD2,,X,:∀(D)(E)(F);#,(A),15%,[1415](C),30%,(C)(A),730%.(a);(b)(a)1;(c)(a)2Fig.7Electronmicroscopephotographandenergydispersiveanalysisoftheroastingproductobtainedwith30%coa:l(a)roastingproduct;(b)energydispersiveanalysisofPoint1inFig.(a);(c)energydispersiveanalysisofPoint2inFig.(a);∃,,5%75%,(D),15%,,,;%,(H),;&(B),.,,.A(Fe,Ni);BMg2SiO4;CFe064Ni036;DSiO2;EMg3-x[Si2O5](OH)4-x;FFe2O3;HC6XFig.6XRDpatternsofroastingproductsobtainedwithdifferentcoaldosages730%.!711!32,,().,:(7(a)1),7(b);(7(a)2),7(c).,,,,,,.4(1)186%1359%,50%,.(2)KD2,.(3),,.(4),,-0074mm80%,-0043mm95%.200kA!m-1.(5),KD2,,,.,,,,KD2,.[1]MaoQR.Themetalofstrategicreservenicke.lChinaResourRecycl,1999(10):36(..,1999(10):36)[2]FanXR,WangXD.SeveralconsiderationsonthecurrentsituationofChinesenickelindustry.NonferrousMetInd,2001(11):16(,..,2001(11):16)[3]ChenJB,XuJH.CurrentsituationandcountermeasuresofChinesenickelmines.MinExpress,2006(8):1(,..,2006(8):1)[4]LiJH,ChengW,XiaoZH.Summaryoflateritenickeloretreatmentprocess.HydrometallChina,2004(4):191(,,..,2004(4):191)[5]XuQX.Thepastandthefutureoflateritemine.ChinaNonferrousMetall,2005(6):1(..,2005(6):1)[6]LanXH.Thenickelhighvoltagehydrometallurgica.lWorldNonferrousMet,2002(1):5(..,2002(1):5)[7]WhittingtonBI,McDonaldRG,JohnsonJA,eta.lPressureleachingofaridregionnickellateriteore.Hydrometallurgy.2003,70:31[8]WhittingtonBI,JohnsonJA,QuanLP,eta.lPressureacidleachingofaridregionnickellateriteore:Part11Effectoforetype.Hydrometallurgy,2003,70:47[9]FuJG,WangH,LingTY,eta.lResearchcurrentstatusandprogressoflateritenickeloretreatmentprocess.Ferroalloys,2009(3):20(,,,..,2009(3):20)[10]ZhangHQ,RenYF,GuanJF.Thestudyofrefractoryhematiteandlimonitebyroastingandmagneticseparationtest.ChinaMin,2006(5):44(,,..,2006(5):44)[11]RenYF,YuYF.Magneticroastingstatusanddevelopmentdirectionofrefractoryrediron.MetMine,2005(11):20(,..,2005(11):20)[12]ShangZS,MaLY.SeveralexperiencesinmeltingFeAlCpermanentmagnetsbyusinggraphitecrucible.ShandongMetall,2000(1):69(,.FeAlC.,2000(1):69)[13]WangZF,ZhangYC,LiRC,eta.lGraphitecrucibleimpregnationantioxidantstudy.NonMetMines,2004,27(3):3(,,,..,2004,27(3):3)[14]KotzseIJ.PilotplantproductionofferronickelfromnickeloxideoresanddustsinaDCarcfurnace.MinerEng,2002,15:1017[15]BergmanRA.Nickelproductionfromlowironlateriteoresprocessdescriptions.CIMBull,2003,96(2):127!712!