第页中国矿业大学2011届本科生毕业设计专业英文翻译中国矿业大学毕业设计英语翻译姓名：学号：学院：应用技术学院专业：矿物加工工程翻译题目：选煤厂介耗分析指导教师：职称：讲师英文原文AnanalysisofmediumlossesincoalwashingplantsAbstractAmajoroperatingcostindense-mediumseparationisinreplacementoflostmediumsolids.Thelossofmediumsolids,beingcostly,playsacrucialroleindeterminingtheeconomicsofanypreparationoperation.Coalwasheriesthatemploydense-mediumcyclonesoftenattemptoptimizationoftheprocessesbyvaryingthevortexorthespigotdiameterandthefeedrelativedensity.Whilethesechangeshelpinclosercontroloftheseparationprocess,theyalsoresultinmediumlossesduetochangesinthemediumsplitratio(ratioofthemediumflowrateinoverflowtounderflow).Sincemediumsolidsarelostbyadhesiontoproductsandasmagneticseparatoreffluent,theeffectofthechangeinmediumsplitratioonthedrain-and-rinsescreensand,hence,themagneticseparatorcircuitneedstobestudied.InTataSteel'scoalwasheries,atJharkhandIndia,whichemploysprimaryandsecondarydense-mediumcyclonesinseriestoproducecleancoal,middlingsandrejects,reducingtherelativedensityoffeedmedium,hadaninsignificanteffectonthemediumsplitratio.Ontheotherhand,changingtheconeratio(ratiooftheoverflowdiametertotheunderflowdiameter)changedtherelativedensityandtheflowratesthroughthecycloneoutlets,thusaffectingtheperformanceofthemagnetiterecoverycircuit.Asystematicstudythroughlaboratorytestsandadetailedplantsamplingcampaignhelpedinidentifyingthecausesofmagnetiteloss.Uponimplementationoftherecommendations,themagnetitelossesdecreased,resultinginasavingofapproximatelyUS$27,500perannum.Thestudyalsohelpedinevolvingsomecheckpointsforplantoperatorsforidentifyingmagnetitelosses.Keywords:dense-mediumcyclone;magnetitelosses;drain-and-rinsescreens;magneticseparators1.IntroductionDense-medium(magnetiteinthecaseofcoal),aslurry/suspensionhavingarelativedensityintermediatetothatofvaluablemineralandgangue,isgenerallyusedasthemediumofseparationinmostcoalpreparationplants.Themedium,beingcostly,playsacrucialroleindeterminingtheeconomicsofanypreparationo