简介：SupportedbytheStateCommissionofScienceandTechnology,researchersatBaotouResearchInstituteofRareEarthandBeijingGeneralInstituteofNon-ferrousMetalshavecompletedtheresearchprojectofthestateimportanceduringtheEighth-FiveYearPlan——"StudyonthePreparationandAnalysisMethodofHighPurityIndividualRareEarthOxide".

简介：Thepapermainlydiscussedtheinclusionsandthepurityofmoltensteelandcontinuouscastingslabintapping,argon-bubbling,LFrefining,VDvacuumdegassingandcontinuouscastingtundishprocessesduringthesteelmaking.Atthesametime,theimprovementmeasuresofsmeltingprocesswereindicated.Si-Al-BaalloyandCa-Sideoxidationeventuallywereadoptedin120tconverter.Theamountofthetappingwasabout135t.AfterfeedingAlwireandaddingpremeltedslaginfurnace,pickedupthesampleafterthebottomargon-bubblingwhichhadbeendoneforover5minutes.Thelime,fluorite,calciumcarbideandAlpowderswereusedtoproducewhiteslaginLF.Thenthealloycompositionswereadjusted.FeedingCawireafterthetreatment,andtookoutover5minutes’softconverting.TheVDvacuumdegassingshouldbekeptfor15minutesbellow1.5torr.Afterthat,Cawirecouldbefed.Finally,castingtheslabintothesizeof260mm×2280mm.Theresearchshowed:（1）Inconverterprocedure,thedephosphorizationeffectturnedoutgoodwhentheratioofdephosphorizationwas88.2%.Thefinaloxygenandnitrogencontentssatisfiedthedemand,andtheeffectsofthefinalcontrolandbottom-blowingweregood.（2）DuringtheLFrefiningprocess,thenitrogenseldomadded.Itshowedtheexcellentsealingeffectandtheoptimizationoftechniquesonoperatingwhichhadreachedthedomesticleadinglevel.（3）AftertheVDvacuumdegassingprocess,theSi,Mn,P,O,Ncontentswerealmoststeady.Thesulphurcontentkeptdecreasingto0.003%andthe[H]contentwas1.9ppm.Theeffectofthevacuumdegassingprocesswasgood.（4）Theoxygencontentwascontrolledat11ppminthecontinuouscastingprocess,andthenitrogencontenthadincreasedto53ppmwiththeΔ[N]28ppm.Therefore,inordertopreventthemoltensteelfromreoxidization,theprotectionofthecontinuouscastingshouldbecontrolledrigorously.（5）TheinclusionsthatexistedbeforetheLFrefiningprocessweremostlyMnO-Al2O3-SiO3compositeinclusions

简介：ThechemicalcompositionandmicrostructureofTibetanmicrocrystallinemagnesitewerestudiedbymeansofXRF,XRDandFESEM.Itisfoundthatthemicrocrystallinemagnesitehasuniformlydistributedgrains,mostlyintherangeof2-4μm,andtheMgOcontentis47.80%.Infusedmagnesia,thedrusesarecolorlesstransparentpericlasemegacrystswithoutimpurity,whilethecrustsandiswhite,withahighMgOcontentupto97%-99%.Thepericlasecrystalsarebig,appearingasfacedandstep-growthmorphology.Massivesecondarylongcolumnarpericlaseiscrystallized.

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简介：Afterconstructionformorethanhalfayear,highpurityrareearthadvancedmaterialsprojectenteredtheperiodofequipmentsinstallationinHezhoucity.Withtotalinvestmentofmillion,theproductionlinewillmainlyproducehighpurityREphosphormaterialsandREhydrogenstoragematerials.Aftercompletionoftheproject,annualproductioncapacityofthelinewillreach2,500tonsofREadvancedmaterialsperyear.Annualsalesincomewillreachmillion.HighPurityREProjectWillPutintoProductioninHezhouC...

简介：YB/T384-20111ScopeThisstandardspecifiestheclassification,technicalrequirements,testmethods,qualityappraisalprocedures,packing,marking,transportation,storage,andqualitycertificateofsilicarefractorymortars.Thisstandardisapplicabletosilicarefractorymortarsforliningsilicabricks.2NormativeReferencesThefollowingdocumentsareessentialtotheapplicationofthisstandard.Fordatedreferences,onlytheeditioncitedapplies.

简介：ThroughanisotropicAgovergrowthonthesurfaceofAunanobipyramids(AuNBPs),high-purityandsizecontrolledAgnanorods(Au/AgNRs)areobtainedbyasimplifiedpurificationprocess.ThediametersoftheAu/AgNRsaredeterminedbythesizeoftheas-preparedAuNBPs,andthelengthsoftheAu/AgNRsaretunableusingdifferentamountsofAgprecursorinthegrowthsolution.Surface-enhancedRamanscattering(SERS)studiesusingRhodamine-6G(R6G)asatestmoleculeindicatethattheAu/AgNRshaveexcellentsensingpotential.ThetunableopticalpropertiesandstrongelectromagneticeffectoftheAu/AgNRs,alongwiththeirsuperiorSERSsignalenhancement,showthatAu/AgNRsarepromisingforfurtherapplicationsinplasmonsensingandbiomoleculardetection.

简介：Thesorption-enhancedsteamreformingprocessofmethanol(SESRP-MeOH)toproducehigh-purityH2wasthermodynamicallyandexperimentallystudied.ThermodynamiccalculationsshowedthatataCO2adsorptionratioof95%,productgascontains98.36%H2,32.8ppmCOundertemperatureof130°Candsteam-to-methanol(S/M)molarratioof2.However,withoutadsorption-enhanced,theproductgascontainsnearly74.99%H2with24.96%CO2and525ppmCO.Toverifythethermodynamiccalculationresults,experimentswereperformedinafixed-bedreactorloadedwithcommercialCuO/ZnO/Al2O3methanolreformingcatalystand22%K2CO3-promotedhydrotalciteasCO2adsorbent.Experimentalresultsshowedthat99.61%H2couldbeobtainedbySESRP-MeOHatreactiontemperatureof230°CandS/Mof2.UnderthesameCH3OHconversion,thereactiontemperaturedecreasedbyalmost50°CandH2concentrationincreasedofmorethan20%usingSESRP-MeOHcomparedwithsolelysteamreformingofmethanol.Thecharacterizationoftheadsorbentandcatalystshowedthattheadsorbentshowedgoodstabilitywhilethecatalystwasseriouslysinteredunderthehighregenerationtemperatureoftheadsorbent.

简介：AnimprovedmethodhasbeendevelopedforenrichinganddeterminingtraceIn,Pt,Sn,Co,Hg,Pb,Ni,Bi,Pd,CuandAginhigh-puritygallium.SamplewastreatedbyPDM（partialdissolutionofmatrix）withHCl（11mol/L）-HNO3（0.5mol/L）toasmallresidueofwhichGawasthenremovedbyextractionwith1mlisopropylether.TheconcentratedimpuritiesweredeterminedbyAESprocedure.Therecoveriesfortheele-mentsattherangeof0.02～0.2μgare95～103％;therelativestandarddeviationsfordeterminedimpuritiesoverarangeofn.10-7～n·10-8％are4.3～12％;thedetectionlimitofmostelementscanreachn·10-7～n·10-8％levelwiththeexceptionofHgandPt.Thismethodhasbeensuccessfullyusedtoanalyzemanysam-plessentbyfactoriesandinstitutes.

简介：Usingorganicaquaregia,arecentlydiscoveredpowerfulorganicleachingagent,aneffectiveprocessofrecoveringPtdirectlyfromPt-Aubimetallicnanoparticleswasdemonstrated.ThepuritiesofthePtrecoveredfromamixtureofAuandPtnanoparticlesandfromPt-Aucore-shellnanoparticlecatalystareashighas(99.49±0.22)％,and(95.02±0.08)％,respectively.Thenovelrecoveryprocesspromisesapplicationsincatalysisindustry.

简介：Anoveltwo-stagereductionprocessforsynthesisofultrafinenickelpowderwithahighpurityandlowdensityinafluidizedbedreactorhasbeendevelopedinthiswork.TherawultrafineNiOparticlesarefirstpre-reducedusinghydrogenatlowertemperatures(340-400℃),followedbyfurtherreductionathighertemperatures(500-600℃).Theself-agglomerationofNiparticlesformedduringlow-temperaturereductiondecreasesthesinteringactivityofthenewlyformedultrafineNiparticles,leadingtogoodfluidizationquality,evenforthesubsequenthigh-temperaturereductionprocess.TheagglomeratedNiparticleshaveahighNicontent(above99wt%),alowdensity(0.78g/cm~3)andauniformparticlesize(approximately100μm).Aconceptdesignforanoveltwo-stagefluidizedbedreactorprocessusedtoproducehigh-purityNipowderwasalsoproposed.Thisapproachmaybeextendedtothesynthesisofotherultrafine/nanosizedmetalsormetaloxidesthroughafluidizationmethod.

简介：Ultra-puremesoporoussilicamicrosphereswithgoodmonodispersityweresynthesizedintwosteps:nanometer-sizedsilicasolwasproducedbythesol-gelprocess,thenmicrometer-sizedsilicamicrospheresweresynthesizedbypolymerization-inducedcolloidaggregationofthesilicasol.Thetotalmetalcontentofthemicrosphereswasextremelylow,whicheliminatedthetailingofchromatographicpeaksbychelatingreagents.Theporestructureofthesilicamicrospherescouldbecontrolledbyalteringthesol-gelconditions.Thesilicamicrosphereparticlesizecouldbeadjustedbyusingdifferentpolymerizationinducedcolloidaggregationconditions.

简介：TiO2nanoparticlesweresynthesizedbyahomogeneouscontrolledprecipitationmethodusingindustrialtitaniumsulfate(Ti(SO4)2).TheobtainedpowderswerecharacterizedbyX-raydiffraction(XRD),transmissionelectronmicroscope(TEM),Fouriertransforminfraredspectroscopy(FTIR)andICPplasmaspectrometer.EDTAwasusedascomplexingagenttoimprovethepurityandtheformationofTiO2nanoparticles.Experimentalresultsindicatedthatthehigh-purityTiO2nanoparticleswere20nminmeansizeandnearlymonodispersed.

简介：YuetaiA的种子样品，一种Honglian(HL)类型细胞质的男性无菌(厘米)在混合大米的线被调查估计种子纯净并且由在南京，江苏省和Lingshui模仿生物沾染物到YuetaiA分析离开类型植物的原因，海南省在20042006期间。YuetaiA的种子杂质主要源于在生物污染以后然而并非从它的绝育unstability恢复富饶基因(Rf)的基因飘移。十根维护者线，五根restorer线和三thermo敏感的遗传因子的男性，无菌的线在学习使用了的所有能传花粉给生产F1的YuetaiA和YuetaiB种，直接或间接地导致漂流进YuetaiA并且产生iso细胞质恢复产生的Rf基因。而且，高outcrossing率和有许多变化的YuetaiA的类似的标题日期容易在米饭生产力量使用了在生物污染的结果。在移开所有植物，Rf基因在YuetaiA混合了并且阻止Rf基因漂流进YuetaiA以后，YuetaiA和YuetaiB的种子纯净被提起了到100%。

简介：(Y,Gd)BxV1-xO4-x:Eu3+phosphorswerepreparedbysolidstatereaction.Theredemissioncolorpurityof(Y,Gd)BxV1-xO4-x:Eu3+phosphorismuchbetterthanthatoftherecentwidely-usedcommercialredemittingphosphor(Y,Gd)BO3:Eu3+anditsrelativeemissionintensityis84%ofthecommercialphosphor(Y,Gd)BO3:Eu3+.Itisexpectedthat(Y,Gd)BxV1-xO4:Eu3+phosphorwillbeapromisingcandidateforPDP(plasmadisplaypanels)application.