surface modification mechanism of fine coal by electrochemical methods

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1、SurfaceModificationMechanismofFineCoalbyElectrochemicalMethodsJun.20o6J.ChinaUniv.ofMining&Tech.(EnglishEdition)Vb1.16No.2SurfaceModificationMechanismofFineCoalbyElectrochemicalMethodsZHUHong,WANGFang.hui,WANGDian—ZUO,OUZe.shenSchoolofScience,BeijingJiaotongUniversi

2、ty,&fg100o44,ChinaBeijingGenerafResearchforNon—rrousMetals,Beijing100088.ChinaEngineeringandEnvironment,ChinaUniversityofMining&Technology,Xuzhou,Jiangsu221008.ChinaAbstract:Inordertorevealthesurfacemodificationmechanismoffinecoalbyelectrochemicalmethods.thestru

3、cturalchangesofthecoalsurfacebeforeandafterelectrochemicalmodificationwereinvestigatedbyFourierTransfo衄In.fraredSpectra(FnR)andRamanSpectra.Theresultsshowthatundercertainelectrochemicalconditions.theoxy.gen-containingfunctionalgroupinthecoalstructureandtheoxygencontento

4、fabsorptioncouldbereducedandthefloatabilityofcoalimproved.Atthesametime.thesulfurinthecoalwasreducedtothehydrophilicSwhichcouldbeseparatedeasilyfromcoal功Uselectrochemicalmodificationmethodscouldbeusedtochangethestructureandfunc.tionalgrouponthecoalsurfaceandtoenhancethe

5、floatabilityofcoa1.Keywords:finecoal;electrochemistrymodification;modificationmechanism;FTIR;RamanSpectraCLCnumber:TQ028.94:X701.31IntroductionThereisavastamountofcoalinChina,butmostofitisdifficulttocleanduetoitshighashandsulfurcontent.Moremanhalfofthesulfurfoundinrawco

6、alisintheformofpyrite,whichisdistributedincoalinmicro.finesizesorcombinedwithcoa1.Coalmustbebrokentopiecestoincreasetherateofrecoveryofcleanedcoalandtodecreasesulfurandash.Flotationisaveryimportantandwidelyusedmethodfortheremovalofpyritefromhighsulfurcoa1.Ithasbeenrepor

7、ted山atafterinitialoxidation.thepyritesurfacecontainingoxidizedproductssuchaspolysulphideandfreesulfurisnaturallyhydro—phobic.Therearevariouskindsofoxygen.containingfunctionalgroupsincoa1.Themorehydrophilicthecoalis.themoregroupsthereareonthecoalsur.face[1_41.一一Theprinci

8、pleofelectrochemicaldesulfurizationincoalflotationistomodifysurfacecharacteristiesofcoalandpyritebycontrolling