简介：一、市场行情简述本月月初时，TDI国内市场保持平稳，价格方面与上月底几乎持平，国内厂家的报价较之前虽有小幅上扬，但是对市场影响甚微，主要原因还是在下游采购欲望不强烈，场内交投较为冷清的原因。

简介：鲁西化工集团股份有限公司大化肥项目合成氨设计生产能力1200t／d，采用南京国昌公司GC—R023径向反应器大型低压合成氨生产工艺，是目前国内唯一完全采用国内专利技术的大化肥装置。简要介绍了该项目合成氨装置的概况、技术方案及设计、应用情况。

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简介：Al2O3-MgOcastableshavebeenwidelyusedforworkingliningsofsteelladleduetotheirsuperiorhotstrengthandcorrosionresistance.Inthiswork,effectsofmicrosilica,ultrafinealuminaandMgOfinesadditionsontherheologicalbehaviorofthecastableswereinvestigatedbymeansofIBBrheometerV1.0tomeasuretorque(shearstress)undervaryingshearrates.Theresultsshowthatrheologicalpropertiesofcastablesatvaryingshearratesaresignificantlyimprovedwithincreaseofmicrosilicaadditions(from1mass%to5mass%)andcorrespondingdecreaseinwateraddition;thereisonlylittlechangeinrheologicalbehaviorwithvariationofultrafinealuminaandMgOfinesadditions.Optimumultrafinealuminaandmicrosilicaadditionsarerecommendedforcastableswithgoodrheologicalbehavior.

简介：DenseSi3N4BNcompositeceramicswerefabricatedbysparkplasmasinteringat1500,1600and1650℃under50MPafor5minusingSi3N4andBNpowdersasstartingmaterialsand2mass%Al2O3and6mass%Y2O3assinteringadditives.ThevolumefractionofBNinSi3N4BNcompositepowderswaschosenas10%,20%,and30%,respectively.TheresultsofXRDandSEMshowthatα-Si3N4completelyturnsintoβ-Si3N4whenthecompositeceramicsaresinteredat1650℃;theadditionofBNhindersthegrowthofSi3N4grains,refiningthestructure;VickershardnessandfracturetoughnessofthecompositeceramicsdecreasewiththeincreaseofBNcontent.

简介：Researchonnewtypesofcastables,pre-castassemblypartsandthermalinsulationmaterialswithgoodresistancetowear,thermalshockanderosion,andlowthermalconductivity,wasdonetosolveproblemsofhighsystemenergyconsumption,crackingandspallingofpartialliningandmismatchoffurnacetopmaterialandhangingmaterialandsoon,causedbyunreasonabledesignofChina'sAl(OH)3dilutephasefluidizedbedroastingfurnacelining.Severaldifficultproblemssuchasthematchingofdifferentmaterials,preservationofexpansionjointsamongdifferentzonesandreasonablemechanicaldistributionofliningweresolved.'Integratedfurnace'conceptwasestablishedincludingrefractoriesR&D,liningstructuredesign,constructionoptimization,furnacewarmingtechnology,initialoperationandliningmaintenancetechnology.Thekeytechnologiesofhigh-efficiencyandenergy-savingforfurnacesweredeveloped.TheseachievementshavebeenappliedtoChina'sAl(OH)3dilutephasefluidizedbedroastingfurnacestoreduceenergyconsumptionby1000MJpertonalumina,enhancethecapacityandreducetheexhaustgasemission.

简介：介绍了渭化400kt／a甲醇装置原始开车准备工作、开车过程、触媒升温还原情况及生产运行情况，重点阐述原始开车过程中出现的主要问题及相应的解决方法。

简介：AA3月同内己二酸及其盐和酯进口数量2582．1吨，平均单价1941美元／吨，进口量较上月减少54．62％。

简介：Cr2O3canbesinteredwellat1500℃incarbon-embeddedconditionorH2atmosphere.Butthehighchromebearingrefractoriescannotreachdensificationwhensinteredat1700℃for10hinweakreducingatmosphereformedbythecombustionoffuel,anditsapparentporosityisabout18%.Thehighchromebearingrefractoriesaremainlyusedincoalgasifiers.Thetemperatureinthefurnaceisabout1500℃andtheproductsareH2andCO,whicharejustthesinteringconditionsofthedensechromerefractorieswithapparentporositylessthan10%.Thehighchromebearingrefractoriesusedincoalgasifiersmaybesinteredagainandthenshrink,destroyingthegasifierlining.Thethermodynamiccalculationshowsthatitissafeaboutthehighchromebearingrefractoriesusedingasifiers.Itisalsoexplainedthatthehighchromebearingrefractoriescan’tbesintereddenselyinweakreducingatmosphereformedbythecombustionoffuel.Thenewsinteringtechnologiescanbeusedtoimprovethebulkdensityofthehighchromebearingrefractories.

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简介：本文主要对Li2SiO3粉体的固相法合成及低温烧结进行了研究。研究结果表明：原料浓度、混合介质对Li2SiO3相的合成有一定的影响。选择乙醇为球磨介质、并采用高浓度的原料有利于Li2SiO3相的生成。另外,添加B2O3-MgO复合助剂可有效地降低Li2SiO3材料的烧结温度。

简介：论文介绍了笔者对数字信号处理课程的内容与教学方法改革。首先举例说明了FIR、IIR滤波器设计、时域离散系统的网络结构等教学内容中引入SIMULINK工具的教学方法。然后介绍了对相关知识点进行类比讲解的教学方法；还提出了对基本概念进行归纳与梳理，总结了数字信号处理中的三大变换关系，给出了基本关系表。

简介：概述了低温甲醇洗工段关键设备原料气冷却器E1601的性能。分析了引起绕管式换热器壳体．接管管座角焊缝泄漏的原因，制定了3种修复方案，采取更换管座式挖补方法，彻底消除了设备隐患，解决了合成氨装置长周期稳定运行的瓶颈问题。

简介：介绍了陕西渭河煤化工集团2期废水处理装置运行工艺及运行状况，针对SBR工艺在运行控制过程中产生的相关问题及异常情况做了简要分析，并提出了处理措施。

简介：位于罗德岛的TeknorApex公司研发出一种新型熔体强度增强剂母粒，据称可以用于PLA以增强拉力。这使得用挤出造型和热成型法能够获得更大的生产量并降低废品率。