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1、外文资料翻译PortlandCementPreparationofRawMaterials1.CrushingTherawmaterialsasreceivedfromtheminesareinlumpformandhavetobecrushedbeforefinegrinding.Thesizeofthelumpswoulddependupontherawmaterialandthemethodofmining,sothesizeofthecrushingequipmentusedwoulddep
2、endprimarilyuponthesizeofthelumpsreceived.Inamoderncementfactory,manufacturing1000to2000tonnesofcementperday,thelimestoneisminedbymechanicalmeansandhencethesizeofindividualpiecesmaybe1meterorso.Insmallerfactories,theminingoflimestonemaybemanualandthesi
3、zeofindividualpiecesmaybe200mmorso.Similarly,clay,shale,bauxite,laterite,sandstone,coal,gypsum,etc.maybereceivedinsizesnotlargerthan300mm.(a)LimestoneCrushers:Therequirementoflimestoneperdayfora2000TPDfactorymaybeabout2600to3000TPD,fora1000TPDfactory13
4、00to1500TPDandfora300TPDfactory400to450TPD.Astheminingoperationhastobecarriedoutindaylighthoursonly,thecrushingoperationshouldalsobecarriedoutinthe10or12hoursoflightperday.Thecapacityofalimestonecrusherfora2000TPDfactorymaybe300TPH,fora1000TPDfactory15
5、0TPHandfora300TPDfactory50TPH.Thedecisiononthetypeoflimestonecrusherwoulddependuponthephysicalpropertiesofthelimestone;however,forsmallerfactoriesusingmanuallyminedlimestone,singlestageHammerCrushersaremostsuitable;butforlargerfactoriestwostagecrushing
6、isalwaysmoreeconomicalandmoreefficient.ThefirststagemaybeaJawCrusher,GyratoryCrusherorImpactCrusherandthesecondstageaHammerCrusherorConeCrusher.Ifpossible,ascreenofsuitablesizemaybeintroducedafterthesecondarycrushertoallowonlyundersizetogoforfurtherpro
7、cessingwhileoversizeisreturnedtothecrusher.Atypicalflowsheetforalimestonecrushingplantina2000TPDfactorymaybe.Dumpers--FeedHopperwithLaminatedconveyoratthebottom300TPHJawCrusher(feedsize1000mm-productsize200mm)300TPHHammerCrusherorImpactCrusherorConeCru
8、sher(feedsize200mm--productsize20mm300THPVibratingscreenacceptsminus20mm--oversizebacktocrusher.Properdedustingarrangementsmustbemadeatthecrushers,thevibratingscreenandthetransferpointsandaDustCollectorwithfaninstalled.Powerconsumedfort
