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1、EffectofironcontentinsphaleriteonflotationAbstractTheeffectofiron,substitutedintheminerallattice,onthefrothflotationofsphaleritehasbeeninvestigatedatalkalinepH.Ithasbeenfoundthatacriticalcoppersulphateconcentrationexistswheresphaleriterecoveryismaximized,abovewhichtherecoveryofsph
2、aleritethendecreases.Thepresenceofironinsphaleriteisdetrimentaltotherateofsphaleriteflotationandhenceitsrecovery,withthecoarserparticlesbeingmoreaffectedthatthefines.Thepresenceofironreducestheactivationofsphaleritebycopper,whichinturnresultsinareductionincollectoradsorption.Keywo
3、rds:Frothflotation;Flotationactivators;Flotationkinetics;ParticlesizeArticleOutline1.Introduction2.Experimentalsection3.Resultsanddiscussion4.ConclusionsReferences1.IntroductionAsxanthatecollectorshavearelativelylowaffinityforzincions,activationofsphaleritebycopperionsisgenerallyr
4、equiredtofloatsphalerite.Theactivationofsphaleriteinvolvestheexchangeofzincforcopperions,thusprovidingasurfacereceptivetowardscollectoradsorption(Finkelstein,1997).Oneofthemainimpuritiespresentinsphaleriteisiron,whichsubstitutesforzincatomsinthesphaleritelattice,thusreducingthenum
5、berofzincatomsavailableforexchangewithcopper.Previousstudiesinvestigatingtheeffectofironcontentinsphaleriteoncopperactivation,collectoradsorptionandsubsequentsphaleriteflotationhaveproducedconflictingresults(Pomianowskietal.,1975,MukherjeeandSen,1976,Soleckietal.,1979,Nakahiro,198
6、0,HarrisandRichter,1985andGigowskietal.,1991).Forexample,bothanincreaseanddecreaseincopperactivation,collectoradsorptionandfrothflotationofsphaleritehavebeenreportedwithincreasingironcontentinsphalerite.Thelossofsphaleritetotailingsinflotationcircuitsasaresultofinadequateparticles
7、urfacehydrophobicityreducestheeconomicviabilityoftheprocessingoperation.Thusanunderstandingoftheeffectthatironinsphaleritehasontheflotationbehaviourofthismineralmayallowustomaximisesphaleriterecovery.Inthepresentstudy,wehaveinvestigatedtheeffectofironcontentinsphaleriteonsphalerit
8、eflotationasafunctionofparticlesi
