简介:Anisotropicstructures,nanoneedles,andnanospindlesofrareearthhydroxychloride(RE(OH)2Cl)andoxychloride(REOCl)(rareearth=EuandTb)weresynthesized.Therareearthhydroxychloridenanostructureswereformedviaathermallyassistedhydrolysisoftherare-earthsesquioxidenanocrystals.Themorphologicalevolutionofthenanostructureswasstudiedusinghigh-resolutiontransmissionelec-tronmicroscopyandscanningelectronmicroscopy,whilethestructuralevolutionwasinvestigatedusingX-raydiffractiontechniques.Thethermalstabilityoftherareearthhydroxychlorideswasinvestigatedusingthermogravimetricanalysis.Therareearthoxychloridenanospin-dlesweresynthesizedviaasimpleheat-treatmentofrareearthhydroxychloridenanospindles.
简介:High-purityREoxidesareusuallyob-tainedbydissolvingmixedREoxidesinhydrochloricacid,andtheobtainedchlo-ridesolutionisthenextractedandse-paratedafterthenon-rareearthimpuri-ties,especiallythehighcontentPb+2,havebeenremoved.Thisprocessisoneofthekeystotheimprovementoftheproductquality.Somesmeltersusebutylxanthateasapurifyingagent,butlargequantitiesofpoisonousgasesareevol-
简介:ApilotexciterfittedwithREperma-nentmagnet,withacapacityof60-160KVA,hasbeenjointlydevelopedbyShenyangUniversityofTechnology,theHarbinE-lectricMachinePlant,theDongfengElec-tricMachinePlantandtheShanghaiElectricPlant.Theexciterhasbeenputintobatchproductionandisusedco-operatedlywithlargehomemadeelectricgenerators.
简介:PricesoflightrareearthproductsinBaotouroseonthefullscaleinJuly.PriceoflanthanareachedRMB12,000-13,000/t,thatofceriaRMB12,000/t,praseodymiaRMB70,000-72,000/t,Pr-NdoxidesRMB52,000/t,neodymiaRMB65,000/t.DespitethehighpriceofPr-Ndoxidesandneodymia,nogoodsareavailableathand.PricerisingisattributedtoenforcementofenvironmentalprotectionpolicyandheighteningprojectsuspendingofBaogangtailingsdam.REseparationenterprisesalongYellowRiverhave...
简介:Witharapidincreaseinvolumeofve-hiclesintheworld,thepolutioncausedbytheautomobileexhaustedgashasbe-comemoreandmoreserious.Thisproblemhasbroughttoourgovernment’satten-tion.InBeijing,regulationsregardingthesupervisionoftheexhausthavebeenissued.AttheFifthNationalMeetingonRECatalyticpurificationofAutomobileEx-haustheldinBeijing1989,thepartici-pantsfrominstitutes,universities,andfactoriesalloverthecountryreportedanddiscussedthemethodsofpurifica-
简介:Rareearthmasteralloyisoneofthemostim-portantrareearthproductsinChina.Theoutputofrareearthferrosiliconwas3800tonREOin1991,2.2%.increaseincomparisonwith3700tonREOin1990.Itsprincipalapplicationisindomesticfoundryindustry.Sincetheratioofexporttothetotaloutputoftheproductisrathersmallitisunderlittleinflu-