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时间:2019-10-20
《真空碳热还原制备碳氧钛的动力学探究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、doi:10.3969/j.issn.1007-7545.2014.03.014真空碳热还原制备碳氧钛的动力学研究摘要:釆用非等温固相模型对碳热还原TiO2历程和动力学条件进行研究。结果表明,真空碳热还原TiO2可分为四个阶段,第一阶段(1373〜1523K)主要物相为C和TinO2n.i(n>5),第二阶段(1523〜1673K)主要物相为C、TiCosOos和TinO2n・](22、段动力学方程为a2=kt,受一维扩散控制,表观活化能为113.55kJ/mol,第二阶段动力学方程为(1_©尸_1=佔,受二级化学反应控制,温度对还原率影响较大,表观活化能为303.36kJ/mol,第三阶段动力学方程为2l(l-a)-,/2-lJ=Av,受1.5级化学反应控制,还原剂不足对反应影响较大,表观活化能为53.93kJ/moI,第四阶段动力学方程为1一2刃灯,受三维扩散控制,物料疏松成为晶核长大的限制环节,表观活化能为99.22kJ/molo关键词:碳氧钛;动力学;还原历程;表观活化能中图分类号:TF823文献标志码:3、A文章编号:1007-7545(2014)03-0000-00KineticStudyonPreparationofTitaniumOxycarbidebyVacuumThermalReductionZHUFu-xing1,DENGBin1,QINQing-dong2,WANGFang-ping2(1.PangangGroupResearchInstituteCo.,Ltd.,StateKeyLaboratoryofVanadiumandTitaniumComprehensiveResourcesComprehensiveUtil4、ization,Panzhihua617000,China,China;2.ZhengzhouResearchInstituteofCHALCO,Zhengzhou450041,China)Abstract:TheprocessanddynamicconditionofTiO?carbothermicreductionwerestudiedbynon-isothermalsolidmodel.Theresultsshowthatcarbothennicreductionprocessisdividedintofourstages・5、CandTinO2n-i(n>5)arethemainphasesofthefirststage(1373〜1523K),whichgraduallychangeintoC,TiCo.sOo.sandTinO2n-i(26、Thekineticequationofthefirststagepresentsasa1=kt,whichiscontrolledbyone-dimensiondiffusionwithapparentactivationenergiesof113.55kJ/mol.Thekineticequationofthesecondstagepresentsas(1_°尸-=kt,whichiscontrolledbythesecond-orderreactionwithapparentactivationenergiesof303.7、36kJ/mol.Temperatureexertssignificantinfluenceinthisstage.Thekineticequationofthethirdstagepresentsas2[(l-a)",/2-l]=^^whichiscontrolledby1.5-orderreactionwithapparentactivationenergiesof53.93kJ/mol,andthisstageislimitedbyinadequatereducingagent.Thekineticequationofthe8、lastpresentsas=kt,whichiscontrolledbythree-dimensiondiffusionwithapparentactivationenergiesof99.22kJ/mol,andthisstageismainl
2、段动力学方程为a2=kt,受一维扩散控制,表观活化能为113.55kJ/mol,第二阶段动力学方程为(1_©尸_1=佔,受二级化学反应控制,温度对还原率影响较大,表观活化能为303.36kJ/mol,第三阶段动力学方程为2l(l-a)-,/2-lJ=Av,受1.5级化学反应控制,还原剂不足对反应影响较大,表观活化能为53.93kJ/moI,第四阶段动力学方程为1一2刃灯,受三维扩散控制,物料疏松成为晶核长大的限制环节,表观活化能为99.22kJ/molo关键词:碳氧钛;动力学;还原历程;表观活化能中图分类号:TF823文献标志码:
3、A文章编号:1007-7545(2014)03-0000-00KineticStudyonPreparationofTitaniumOxycarbidebyVacuumThermalReductionZHUFu-xing1,DENGBin1,QINQing-dong2,WANGFang-ping2(1.PangangGroupResearchInstituteCo.,Ltd.,StateKeyLaboratoryofVanadiumandTitaniumComprehensiveResourcesComprehensiveUtil
4、ization,Panzhihua617000,China,China;2.ZhengzhouResearchInstituteofCHALCO,Zhengzhou450041,China)Abstract:TheprocessanddynamicconditionofTiO?carbothermicreductionwerestudiedbynon-isothermalsolidmodel.Theresultsshowthatcarbothennicreductionprocessisdividedintofourstages・
5、CandTinO2n-i(n>5)arethemainphasesofthefirststage(1373〜1523K),whichgraduallychangeintoC,TiCo.sOo.sandTinO2n-i(26、Thekineticequationofthefirststagepresentsasa1=kt,whichiscontrolledbyone-dimensiondiffusionwithapparentactivationenergiesof113.55kJ/mol.Thekineticequationofthesecondstagepresentsas(1_°尸-=kt,whichiscontrolledbythesecond-orderreactionwithapparentactivationenergiesof303.7、36kJ/mol.Temperatureexertssignificantinfluenceinthisstage.Thekineticequationofthethirdstagepresentsas2[(l-a)",/2-l]=^^whichiscontrolledby1.5-orderreactionwithapparentactivationenergiesof53.93kJ/mol,andthisstageislimitedbyinadequatereducingagent.Thekineticequationofthe8、lastpresentsas=kt,whichiscontrolledbythree-dimensiondiffusionwithapparentactivationenergiesof99.22kJ/mol,andthisstageismainl
6、Thekineticequationofthefirststagepresentsasa1=kt,whichiscontrolledbyone-dimensiondiffusionwithapparentactivationenergiesof113.55kJ/mol.Thekineticequationofthesecondstagepresentsas(1_°尸-=kt,whichiscontrolledbythesecond-orderreactionwithapparentactivationenergiesof303.
7、36kJ/mol.Temperatureexertssignificantinfluenceinthisstage.Thekineticequationofthethirdstagepresentsas2[(l-a)",/2-l]=^^whichiscontrolledby1.5-orderreactionwithapparentactivationenergiesof53.93kJ/mol,andthisstageislimitedbyinadequatereducingagent.Thekineticequationofthe
8、lastpresentsas=kt,whichiscontrolledbythree-dimensiondiffusionwithapparentactivationenergiesof99.22kJ/mol,andthisstageismainl
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