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11Vol.1No.120011TheChineseJournalofProcessEngineeringJan.2001100080(TF5)(TT).pH2.03.0×109/ml2:11:1.;;;TF803.21A1009-606X(2001)01-0049-051[1–2][3][4].Torma[5]10d60%~90%[6]7d87.22%...2.0.68%0.34%0.022%.–30097%–30054%.SZX–B.(TF5)(TT).LeathenStarky30oC140r/min,.;.33.1pH1,2,3250ml5g(–30097%)90mlLeathenpH2.0(pHpH2.0,).10ml(2.5×1091999-11-152000-01-19598341501975-.501/ml).1pH1.5.1,2,3pH1.5,2.0,2.5.2dpHEh.30oC180r/min1(a)1(b).pH.pHpHpH2.0..pH.pH2.0.3.25250ml5g(–30097%)99,95,90,80,70mlLeathen.pH2.01,5,10,20,30ml(3.0×108,1.5×109,3×109,6×109,9×109/ml)48h,30oC180r/min.2(a)2(b).1.1Table1AcidconsumptionunderdifferentinoculationQuantityofinoculation(ml)15102030Acidconsumptionmol/g0.00340.00340.00300.00280.0024051015202530020406080100987654321Day1ml5ml10ml20ml30mlNickelextraction(%)Inoculation(ml)024681012141605101520Inoculation(ml)15102030Copperextraction(%)Time(d)20406080100Nickelextraction(%)024681012141602.50.0006Time(d)0246810121416020406080100Time(d)(b)pHAcid(mol/g)1.50.00202.00.00132.50.0006Copperextraction(%)(a)pHAcid(mol/g)1.50.00202.00.0013(a)Nickelextractionvs.inoculation(b)Copperextractionvs.time2Fig.2Effectofthequantityofinoculationonnickelandcopperleaching1pHFig.1EffectofpHonnickelandcopperleaching15110ml.10ml,Eh65mV(SCE)pH(2.0).FeSO4·7H2OpH..,,,.Eh500~800mV(SCE)Eh7~8d800mV(SCE).3.335g210g(–30054%)5250ml90mlLeathenpH2.048h,30oC180r/min.3.02468101214161820020406080100(b)5%,wild10%,wild5%,wild,+FeSO4·7H2O5%,adapted10%,adaptedCopperextraction(%)Time(d)02468101214161820020406080100(a)5%,wild10%,wild5%,wild,+FeSO4·7H2O5%,adapted10%,adaptedNickelextraction(%)Time(d)3Fig.3Effectofpulpdensityonnickelandcopperleaching31~55%,10%,5%,5%,10%,0.001mol/g.1~3,45.2.8×109/ml35gFeSO4⋅7H2O.,.144h1,294.12%70.59%4,594.12%68.24%.,72h18.55%35.84%..3.4(TF5)(TT).1110ml210ml5ml.2110ml5ml210ml10ml.5%(–30097%)30oC180r/min.4(a)4(b)(I1II2).521.pH.Eh.pH.0246810121416020406080I:TF5(10ml)I:TF5(10ml)+TT(5ml)II:TF5(10ml)+TT(5ml)II:TF5(10ml)+TT(10ml)Nickelextraction(%)Time(d)0246810121416020406080I:TF5(10ml)+TT(5ml)II:TF5(10ml)+TT(5ml)II:TF5(10ml)+TT(10ml)Copperextraction(%)Time(d)(b)I:TF5(10ml)100(a)1004Fig.4Effectofblendofthiobacillusferrooxidansandthiobacillusthiooxidansonnickelandcopperleaching3.5..(1).(2)–30054%0.001mol/g,–30097%0.003mol/g.(3).(4)pH.pH1.2~6.0;2.5~2.8[4].pH2.6.pH2.0.,pH,;pH,pH.4(1)pH2.0(2)3.0×109/ml(3)(3)2:11:1.[1]YellojiR,MirajkarK,NatarajanKA,etal.GrowthandAttachmentofThiobacillusFerrooxidationsDuringSulfideMineralLeaching[J].Int.J.Miner.Process.,1997,50:203–210.[2]CrundwellF.TheFormationofBiofilmsofIron-oxidisingBacterialonPyrite[J].MineralsEngineering,1996,1(10):1081–1089.153[3]MiguelNH,JacquesV,WiertzPR.APhenomenologicalModeloftheBioleachingofComplexSulfideOres[J].Hydrometallurgy,1989,22:193–206.[4],.[M].:,1997.96–129.[5]ArpadET.MicrobiologicalExtractionofCobalt,Nickel,andCopperfromSulphideOresandConcenrates[P].CanadaPatent50970/73,1974–07–11.[6],,,.[J].,1990,20(1):82–87.BioleachingofLow-gradeNi–CuSulfideOreCHENQuan-jun,FANGZhao-heng(Inst.Chem.Metall.,ChineseAcademyofSciences,Beijing100080,China)Abstract:Bioleachingoflow-gradeNi–CusulfideorefromJin–chuanwiththiobacillusferrooxidans(TF5)andthiobacillusthiooxidans(TT)isinvestigated.TheeffectofpH,inoculation,pulpdensityonleachingispresented.TheleachingprocessinoculatedwithdifferentblendofTF5andTTisalsoexamined.TheseexperimentsconfirmthattheleachingpHshouldbecontrolledatabout2.0,thebestinoculationquantity3.0×109cells/ml,lowpulpdensityismorefavorableforleaching,andtheextractionofnickelisincreasedbyinoculationwiththeblendofTF5andTT.Keywords:thiobacillusferrooxidans;thiobacillusthiooxidans;bioleaching;low-gradeNi–Cusulfideore