简介：Theresources,miningcapacityandcalcinationcapacityofrefractorygradebauxiteinChinamarketwereintroduced.Thenmajorenvironmentalprotectionregulationslaunchedoverthepastyearswerebrieflyreviewed.Meanwhilesomethoughtsabouttheoutlookofthemarketwereshared.

简介：LeachingexperimentsonmetakaolinshowthatthefinalAlextractionratioreachedinabatchreactionisstrikinglyinfluencedbytheinferiorporestructuregeometryofthemetakaolinpellets.Bycalciningkaolinparticlesadheredinlowhumiditystate,avarietyofmetakaolinpellet,insidewhichalargeopeningsstructuredeveloped,hasbeenprepared.Thestructureremarkablybenefitsleachantiontransference,so,thevarietyhashighacidleachingreactivity,evencoarseasthepelletsare,itsaluminumextractedratiostillhasalinearrelationshipwithleachingtime,andtheleachingkineticsismaintainedzeroorderuptoasignificantconversiondegree.ArevisedPellet-ParticleModelhasbeendevelopedtointerpretthestructureinfluenceonAlextractionratio.

简介：医药石头manifanshi被使用极化光显微镜学研究，X---光线衍射(XRD)，和感应耦合等离子体原子发射光谱法(ICP-AES)方法。未加工的Manifanshi的XRD模式显示它主导地由斜长石组成，正长石，石英，和在1000deg6号元素碳的化学符号的锻烧的Manifanshi的证明在斜长石和正长石的晶体结构的失真在锻烧的温度发生。极化光显微镜学观察建议Manifanshi是自然地捱过的monzo花岗石斑岩。化学分析表明因此，Manifanshi包含很多个有益健康的痕量元素和稀罕有毒的痕量元素它是高质量的Manifanshi。痕量元素的溶解度被从在由ICP方法改变温度情况下面锻烧的Manifanshi测量痕量元素的集中决定，结果建议在1000deg6号元素碳的化学符号的锻烧的产品在水里在离子的集中和痕量元素的溶解率显示出理想的结果，它被贡献在锻烧的温度的长石的晶体结构的失真。

简介：Propertiesofrefractoriesaffecttheirperfor-manceanddeformationbehaviouraswellastheirultimatefailuremode,Thereforeinordrtoassessthecapabilitiesofmaterials,usedforrefractorylin-ings,inservicetheirpropertiesmustbeevaluated.Inthisworktheevaluationofsomephysicalpropertiesofcalcinedkaloin(Kibi,Ghana)aggregatere-fractorybodiesshowedanaverageporosityandspe-cificgravityof24%and2.78respectively,Anav-eragecoldcrushingstrengthof19.6MPawasalsoobtained.Thermalexpansionandbehaviourunderaconstanthotloadof196kPaalsoshowedgoodresis-tancetohightemperaturedeformation.

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简介：NickelnitratewasintroducedintocarbonblocksbyusingECAaggregatesascatalyst-carrier.TheNi-containinganthraciteaggregateswerefirstlypreparedbymixinganthraciteaggregatesinnickelnitrateethanolsolutionandthenincorporatedintocarbonblocksafterpre-treating.Thephasecomposition,microstructureandpropertiesofallcarbonblocksfiredat1000℃or1400℃inacokebedwerestudiedwiththeaidofanX-raydiffractomer,afieldemissionscanningelectronmicroscope,amercuryporosimetryandalaserthermalconductivitymeter.TheresultsshowedthattheadditionofNi-containinganthraciteaggregatespromotedtheformationofone-dimensionalnanocarbonandβ-SiCwhiskersat1000℃andthegrowthofβ-Sialonat1400℃,respectively.Moreover,thecoldcompressivestrengthandmicroporositycharacteristicsofthecarbonblockswiththeadditionofNi-containinganthraciteaggregateswereenhancedandthethermalconductivitywasremarkablyimprovedattributingtothehighheatconductivenetworkformedbytheceramicphases.

简介：ExtractingB2O3fromcalcinedboronmud(CBM)wasstudied.TheeffectoffactorssuchasreactiontemperatureandNaOH-to-CBMmassratioonB2O3extractionefficiencywasinvestigated.TheresultsshowthatincreasingreactiontemperatureandNaOH-to-CBMmassratioincreasesB2O3extractionefficiency.TherearetwostagesfortheB2O3extractingprocess:0–20ministhefirststage,whichisrapid;20–50ministhesecondstage,whichisslowerthanthefirststage.Theoverallextractingprocessfollowstheshrinkingcoremodel,andthefirstandsecondstagesaredeterminedtoobeythesurfacechemicalreactionmodelandthediffusionthroughtheproductslayermodel,respectively.Theactivationenergiesofthefirstandsecondstagesarecalculatedtobe41.74and15.43kJ·mol-1,respectively.TheB2O3extractingkineticsequationsofthefirstandsecondstagesarealsoobtained.

简介：ThecorrelationbetweenphasestructuresandsurfaceacidityofAl2O3supportscalcinedatdifferenttemperaturesandthecatalyticperformanceofNi/Al2O3catalystsintheproductionofsyntheticnaturalgas(SNG)viaCOmethanationwassystematicallyinvestigated.Aseriesof10wt%NiO/Al2O3catalystswerepreparedbytheconventionalimpregnationmethod,andthephasestructuresandsurfaceacidityofAl2O3supportswereadjustedbycalciningthecommercialγ-Al2O3atdifferenttemperatures(600–1200C).COmethanationreactionwascarriedoutinthetemperaturerangeof300–600Catdifferentweighthourlyspacevelocities(WHSV=30000and120000mL·g-1h-1)andpressures(0.1and3.0MPa).ItwasfoundthathighcalcinationtemperaturenotonlyledtothegrowthinNiparticlesize,butalsoweakenedtheinteractionbetweenNinanoparticlesandAl2O3supportsduetotherapiddecreaseofthespecificsurfaceareaandacidityofAl2O3supports.Interestingly,NicatalystssupportedonAl2O3calcinedat1200C(Ni/Al2O3-1200)exhibitedthebestcatalyticactivityforCOmethanationunderdifferentreactionconditions.LifetimereactiontestsalsoindicatedthatNi/Al2O3-1200wasthemostactiveandstablecatalystcomparedwiththeotherthreecatalysts,whosesupportswerecalcinedatlowertemperatures(600,800and1000C).ThesefindingswouldthereforebehelpfultodevelopNi/Al2O3methanationcatalystforSNGproduction.