Fly Ash Separation Using a Novel Rotary Triboelectrostatic Separator

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1、FlyAshSeparationUsingaNovelRotaryTriboelectrostaticSeparatorD．Tao，M．M．Fan，X．K．JiangDepartmentofMiningEngineering，UniversityofKentucky,USAEmail：dtao@engr．uky．edu．ABSTRACTAnovelrotarytriboelectrostaticseparatorhasbeendevelopedandpatentedrecentlyattheUni—versityofKentuckywithu

2、niquefeatures，includingahighefficiencyrotarycharger,chargerelectri—fication．1aminarairflow,ete．Aparametricstudyhasbeenperformedwithacoalcombustionflyashsampletoinvestigatetheeffectsofmajoroperatingparametersontheprocessperformance．Mostsignificantoperatingvariablesandoptimum

3、conditionswereidentified．Separationtestsperformedwithfourflyashsamplesindicatedthattherotarytriboelectrostadcseparatorshowedeffectiveflyashseparation，Keywords：Flyash；Triboelectrostaticseparation；Rotarycharger；ElectrostaticseparatorlNTRODUCTIONElectrostaticseparationisadryse

4、parationprocessbasedonthefactt11atcomponentsofaphysicalmixtureofsolidparticlescanbechargedinabipolarmannerandseparatedinanexternalelectricfield．Therearemanywaysofchargingparticles，includingcorona,contactortribocharging，induction，freezing，ionandelec·tronbeam，thermionics，phot

5、oelectricfieldemission，radioactivedecaycharging，andPY—roelectricandphotoelectriccharging．HoweveLonlythreemechanisms．i,e．，conductiveinduc—tion，contactortribocharging，andionorcoronabombardmentareusedincommercialequip．ment．Intriboelectrostaticseparationtwodissimilarparticlesar

6、erubbedagainsteachotheroragainstathirdentityreferredtoaschargingdeviceorcharger．Theparticlewithhigherworkfunctionbecomesnegativelychargedandtheo山erpositivelycharged．Theworkfunction西isdefinedastheminimumenergywhichmustbesuppliedtoextractanelectronfromasolid．Itisameasureofhow

7、tightlyelectronsareboundtoamaterial．Inatypicaltubingchargertriboelec．trostaticseparator,particlesbecomechargedbyfrictionsagainstthewallduringtravelinginthe3598tubing。Thechargedparticlesaresubsequentlyseparatedinanexternalelectricfieldasaresultoftheirdifferentmotiontrajector

8、ies．Triboelec—trostaticseparationprocessesareusedinmin—eralbeneficiation，materialp