细粒物料的干式磁选分析

············。胡永会（北京矿冶研究总院，北京100160）、、。、。TD457TD924A1671-9492201304-0052-041。、、。75μm25μm。1颗粒介电常数的影响、150mm。75μm、25μm、。、。4。1。Coehndoi10.3969/j.issn.1671-9492.2013.04.015DiscussiononDrySeparationofFine-GrainedMaterialsHUYonghuiBeijingGeneralResearchInstituteofMiningandMetallurgyBeijing100160ChinaAbstractTheeffectofdrymagneticseparationinseparatingfine-grainedmaterialsmainlydependsongameplayingbetweenintergranularmicroforcessuchasattractiveelectrostaticvanderWaalsandattractivecapillaryforcesandexternalmacroforcessuchasgravitymagneticandcentrifugalforces.Thereforebasedonthistheeffectofmacromeasurableparameterscontainingdielectricconstantparticlesizeandmoistureondrymagneticseparationoffine-grainedmaterialsisanalyzed.Keywordsdrymagneticseparationfine-grainedmaterialdielectricconstantparticlesizemoisture52············。5σs=15×10-6εr1-εr21σsC/m2εr1εr2。、。。2颗粒粒度的影响6。130μm。。2。abc、。2abc。3。3。、、。3湿度的影响。1Table1Dielectricconstantsofseveraltypicalmaterials80.4133.7~8125114.389~1736.12.54~62~36~812.67.41Fig.1Effectofparticlesizeofmagnetiteonitsspecificsusceptibilityandcoerciveforce×·μ●·●●●●●●●2Fig.2Casesofdrymagneticseparationofilmeniteandquartzabc53············τeρ7τe=εrε0ρ2ρΩεrε0。t8σs=σ0exp-t/τe3σ0。。。XCG-2－2mm4。V.G.Derkach9。。。Fcap10Fcap=8πr1γ+4πr22γ1r2-1r14r1r212γ。4Fcap。11Fcap=Ad24l25dlAHamaker0.4~4.0×10-19。。。A.G.Bailey12。。FmagG3—Fig.3Effectofparticlesizedifferenceondrymagneticseparationofilmenite-quartzmixedmineralμμμμμμμμ◆▲●●●●●▲▲▲▲◆◆◆◆●◆▲4XCG-2Fig.4EffectofmoisturecontentbyXCG-2separator●●●●●●▲▲▲▲▲▲-75μm24%-75μm41%-75μm73%●▲54············FcenFcap、FeleFvanFmag、GFcen6。Fcap+Fele+Fvan＞G+Fmag+Fcen65。。M.V.Verkhoturov11－。4结论1。2。3。1.J.2010611-13.2.J.1985218-22.3.M.1990.4CangialosiFCrapulliFIntiniGetal.Modellingoftribo-electrostaticseparationforindustrialby-productsrecyclingC.//PopovVKungolosAGBrebbiaCAetal.WasteManagementandtheEnvironmentIII.PortsmouthUKWITPress200692101-110.5DodbibaGShibayamaAMiyazakiTetal.TriboelectrostaticseparationofABSPSandPPplasticmixtureJ.MaterialsTransactions200344161-166.6.M.198619.7.M.2011253-287.8JanSvoboda.MagneticTechniquesfortheTreatmentofMaterialsM.DordrechtSpringer2004323-326.9DerkachVG.SpecialMethodsofBeneficiationofMineralsM.MoscowNedraPublishers1966.10.M.201089-121.11VerkhoturovMVEmel’yashinYuMTarasenkoVP.MoistureofairandefficiencyofdrymagneticseparationJ.Sov.Min.Sci.198722508.12BaileyAG.ElectrostaticphenomenaduringpowderhandlingJ.PowderTech19843771-81.5—Fig.5Effectofairhumidityondrymagneticseparationofmagnetite-ganguemixtures-45μm-33μm-20μm●▲●●●●▲▲▲▲55