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简介：The11thChangchunSummerConferenceonChem-istry---TheSeminaronChemistryandPhysicsofRareEarthsinValenceFluctuation,sponsoredbytheChi-neseSocietyofChemistry,theChineseSocietyofRareEarths,JilinSocietyofChemistryandChangchunIn-stituteofAppliedChemistry,AcademiaSinica,washeldinChangchunJuly20-22,1992.ProfessorSuqiang,afamouschemistofChangchunInstituteofAppliedChemistry,lecturedtheplenarymeetingon“TheDependenceofValence

简介：ThecopolymerswereformedbythegraftcopolymerizationofPVCwithacrylicrareearth.TheprincipleandmethodofthegraftcopolymerizationofPVCandacrylicrareearthwerediscussed.ThegraftcopolymerswerecharacterizedbyFT-IRspectraandscanningelectronmicroscope(SEM).Thethermalstabilityofthegraft-copolymerswasstudiedbythermogravimetricanalysis(TG).Theexperimentresultsshowthatthethermalresistanceandtoughnessofthegraftcopolymersareobviouslyenhanced.

简介：ASXlistedheavyrareearthsproducerNorthernMinerals'firstshipmentofheavyrareearthcarbonatehasleftthecompany'sBrownsRangeminesiteintheEastKimberleyregionofWA.Thealmost2.6tonneshipmentconstitutesarareearthcarbonateproductthatwasproducedduringthecommissioningphaseofoperationalstart-upatthemineandwillbesenttoDarwinPortforshipmenttocustomersinChinainthenextfewdays.

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简介：ＡｐｐｌｉｃａｔｉｏｎｏｆＲａｒｅＥａｒｔｈｓｉｎＯｉｌＣｏｕｎｔｒｙＴｕｂｕｌａｒＧｏｏｄｓＬｉｎＱｉｎ（林勤），ＹａｏＴｉｎｇｊｉｅ（姚庭杰），ＬｉｕＡｉｓｈｅｎｇ（刘爱生）ＣｈｅｎＮｉｎｇ（陈宁），ＹｅＷｅｎ（叶文），ＹｕＺｏｎｇｓｅｎ（余宗森...

简介：ExperimentsfordeterminingceriumisotopeionexchangerateswithmacroporousresinsAmberlyst15,D001andXN1010arediscribed.ThekineticsoftheisotopeionexchangereactionhasbeenexaminedbyasimpletheoreticalequationofintraparticleeffectivediffustivityDeinaporousionexchanger.Theionexchangeproceedesbydiffusionwithinthemacroporesandthesolidphaseoftheresin,DeofceriumwasaffectedbytheconcentrationofthebulksolutionCandwasseparatedintoamacroporediffusivityD^-pandasolidphasediffusivityD^-gbytheequation.Thediffusioncoefficientsoftheexchangingionareshowntohavethevaluesinthemacroporescomparablewiththoseinthebulksolutionandtohavethevaluesinthesolidphasecomparablewiththoseingelresinwiththesamecrosslinkageastheresinsusedfortheexperiments.

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简介：Rareearthindustry,withproductionvaluelessthan30trillionyuan,hasbecomethehottopicbothinsideChinaandintherestoftheworldsince2009.Eveninstockmarket,rareearthwasoneofthemostactivesectors.Mediainvariouscountries,specialistsindifferentfieldsandmanypoliticalfiguresworldwideaswellassomenetizensshowedextraordinaryconcerns

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简介：Theneedformoreactiveandhydrothermallystablefluidcatalyticcracking(FCC)catalyststocombattheeffectofmetalcontaminantshasledtoanincreaseindemandforrareearthoxides.RareearthoxidesenhancecatalystactivityandpreventthelossofacidsitesduringtheFCCunitoperation,especiallywhenheavyresiduewithhighmetalcontentisusedasfeed.Inthispaper,areviewwascarriedouttoshowtheeffectsofrareearthelementsonthestructure,activity,andstabilityofFCCcatalysts.Also,theuseofrareearthelementsasvanadiumtrapswasanalyzedinconjunctionwiththemechanismofcatalystdeactivationbyvanadium.TheobjectivewastoelucidatetheinteractionofvanadiumspecieswiththezeolitecomponentoftheFCCcatalystsandtheroleofrareearthelementsincounteringthedeleteriouseffectsofvanadiumontheFCCcatalysts.

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简介：ＭｏｄｉｆｙｉｎｇＥｆｅｃｔｏｆＲａｒｅＥａｒｔｈｓａｎｄＴｉｔａｎｉｕｍｏｎＡｕｓｔｅｎｉｔｉｃＭａｎｇａｎｅｓｅＳｔｅｌＺｈｕＲｕｉｆｕ（朱瑞富），ＬüＹｕｐｅｎｇ（吕宇鹏），ＬｉＳｈｉｔｏｎｇ（李士同）ＣｈａｏＺｈｉｑｉａｎｇ（朝志强），Ｗａ...

简介：ThisarticlewascompiledaccordingtothespeechofMr.ZHANGZhongattheFourthBaotouChinaInternationalRareEarthForum.Inrecentyears,developmentofBaotouSteelRareEarth(Group)Hi-TechCo.,Ltd.(hereinafterasBaogangRareEarths)hasfocusedonfivekeyaspects,whichalsoattractconcernsfromrareearthindustry.

简介：Rareearthcompoundsasmodifiersusedwidelyinmodernfrictionmaterialscanenhancetheinterfacialbindingofconstituentsofmaterialsandimprovethecomprehensivepropertiesofmaterialsevidently.However,therearestillfewreportsonapplicationofrareearthinautomotivefrictionmaterials.Inordertostudytheeffectmechanismofrareearthsinfrictionmaterials,arareearthcompoundwasselectedasadditiveandtheeffectsofmaterialsdopedwithorwithoutrareearthonfrictionandwearpropertiesofmaterialswerestudied.Themicrostructureandwornsurfacemorphologywereobservedbyscanningelectronmicroscopyandthemacroperformancewasdiscussed.Wornsurfaceelementconstitutionofmaterialswasanalyzedbyenergydispersivespectroscopy.Effectmechanismofrareearthsonfrictionandwearbehaviorsoffrictionmaterialswerediscussed.Theresultsshowthatdopingrareearthsinfrictionmaterialscanstabilizefrictioncoefficient,lowerthewearrateofmaterialsandincreasetheimpactstrengthofmaterials.Theflexibilityandfractureresistanceofmaterialsisgreatlyimproved.Wornsurfaceofmaterialsdopedwithrareearthiscompactandthesurfaceadhesionisgreatlyenhanced.