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1、外文资料翻译PortlandCementPreparationofRawMaterials1.CrushingTherawmaterialsasreceivedfromtheminesareinlumpformandhavetobecrushedbeforefinegrinding.Thesizeofthelumpswoulddependupontherawmaterialandthemethodofmining,sothesizeofthecrushingequipmentusedwoulddependprimarilyuponthesizeoft
2、helumpsreceived.Inamoderncementfactory,manufacturing1000to2000tonnesofcementperday,thelimestoneisminedbymechanicalmeansandhencethesizeofindividualpiecesmaybe1meterorso.Insmallerfactories,theminingoflimestonemaybemanualandthesizeofindividualpiecesmaybe200mmorso.Similarly,clay,sh
3、ale,bauxite,laterite,sandstone,coal,gypsum,etc.maybereceivedinsizesnotlargerthan300mm.(a)LimestoneCrushers:Therequirementoflimestoneperdayfora2000TPDfactorymaybeabout2600to3000TPD,fora1000TPDfactory1300to1500TPDandfora300TPDfactory400to450TPD.Astheminingoperationhastobecarriedo
4、utindaylighthoursonly,thecrushingoperationshouldalsobecarriedoutinthe10or12hoursoflightperday.Thecapacityofalimestonecrusherfora2000TPDfactorymaybe300TPH,fora1000TPDfactory150TPHandfora300TPDfactory50TPH.Thedecisiononthetypeoflimestonecrusherwoulddependuponthephysicalproperties
5、ofthelimestone;however,forsmallerfactoriesusingmanuallyminedlimestone,singlestageHammerCrushersaremostsuitable;butforlargerfactoriestwostagecrushingisalwaysmoreeconomicalandmoreefficient.ThefirststagemaybeaJawCrusher,GyratoryCrusherorImpactCrusherandthesecondstageaHammerCrusher
6、orConeCrusher.Ifpossible,ascreenofsuitablesizemaybeintroducedafterthesecondarycrushertoallowonlyundersizetogoforfurtherprocessingwhileoversizeisreturnedtothecrusher.Atypicalflowsheetforalimestonecrushingplantina2000TPDfactorymaybe.Dumpers--FeedHopperwithLaminatedconveyoratthebo
7、ttom300TPHJawCrusher(feedsize1000mm-productsize200mm)300TPHHammerCrusherorImpactCrusherorConeCrusher(feedsize200mm--productsize20mm300THPVibratingscreenacceptsminus20mm--oversizebacktocrusher.Properdedustingarrangementsmustbemadeatthecrushers,thevibratingscreenandthetransferpoi
8、ntsandaDustCollectorwithfaninstalled.Powerconsumedfort
