高岭土提纯工艺及其应用研究进展-豆柴文库

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高岭土提纯工艺及其应用研究进展
I.Introduction
Kaolin,alsoknownasChinaclay,isanaturallyoccurringclaymineralfoundinmanypartsoftheworld,includingChina,theUnitedStates,BrazilandtheUnitedKingdom.Kaoliniscomposedprimarilyofthemineralkaoliniteandistypicallyusedinceramics,paper,paint,plastics,rubber,andotherindustries.However,thequalityandpurityofkaolincanvarygreatlydependingonthesourceandmethodsusedtoextractandrefineit.Consequently,kaolinbeneficiationandpurificationmethodshavebeenofgreatinteresttoresearchersformanyyears.
II.KaolinPurificationTechniques
Therearenumeroustechniquesavailableforthepurificationandbeneficiationofkaolin,includingphysicalseparation,chemicalleaching,andthermaltreatment.Eachmethodhasitsownadvantagesanddisadvantages,dependingonthespecifictypeofkaolin,theimpuritiespresent,andthedesiredenduse.Someofthemostcommonlyusedkaolinpurificationmethodsarediscussedbelow.
A.PhysicalSeparation
Physicalseparationtechniquessuchasmagneticseparation,flotation,andsedimentationhavebeenwidelyutilizedforkaolinpurification.Magneticseparationisaparticularlyeffectivetechniquefortheremovalofironoxidemineralspresentinkaolin.Flotationandsedimentationarealsowidelyused,withthelatterbeingespeciallyeffectivefortheseparationoffinekaolinclayparticlesfromcoarseimpurities.
B.ChemicalLeaching
Acidleachingisanotherpopulartechniqueusedforthepurificationofkaolin.Thismethodinvolvesusinghydrochloricacidorsulfuricacidtodissolveimpuritiesandincreasethebrightnessandpurityofkaolin.However,acidleachingcanalsoresultinthelossofsomedesiredkaolinproperties,particularlyitsmechanicalstrength.
C.ThermalTreatment
Thermaltreatmentmethods,suchascalcinationandirradiation,havealsobeenemployedforkaolinpurification.Calcinationinvolvesheatingkaolinathightemperatures,whichcausesthekaolintodehydroxylateandacquireamoreuniformparticlesizedistribution.IrradiationinvolvesusingUVlightorgammaraystobreakdownorganicimpuritiespresentinkaolinclay.
III.ApplicationsofPurifiedKaolin
Purifiedkaolinhasawiderangeofapplicationsinvariousindustries