基于热重分析的(Al_2O_3–C)/Fe体系的反应动力学
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摘要
借助于热分析仪,通过热重分析研究了(Al_2O_3–C)/Fe体系中的反应动力学特征。在氩气气氛和不同升温速率下,对(Al_2O_3–C)/Fe试样进行了热重实验。计算出不同阶段反应的活化能Ea、指前因子A和反应速率常数k,同时,提出了(Al_2O_3–C)/Fe体系反应的2个阶段,铁熔化前为第1阶段,主要是氧化铝和碳之间的固–固反应,铁熔化后为反应的第2阶段,主要为固–液反应阶段。在高温条件下,铁液的参与使得反应速率加快,促进了氧化铝碳热还原反应的进行。
The kinetic characteristics of reaction in(Al_2O_3–C)/Fe system was investigated by thermogravimetric analysis.(Al_2O_3–C)/Fe powders were heated under argon atmosphere at different heating rates in the thermal analyzer. The activation energies, Ea, the pre–exponential factor, A, and the reaction rate constants, k, were calculated. The reaction stages of(Al_2O_3–C)/Fe were also analyzed. The reaction are mainly solid–solid reaction between corundum and graphite at the first stage before iron melts. The reaction occurs in the solid–liquid reaction stage in the presence of iron liquid when iron powder completely melts. The result by thermogravimetric analysis indicates that the participation of iron liquid can accelerate the carbothermic reduction of alumina at a high temperature.
The kinetic characteristics of reaction in(Al_2O_3–C)/Fe system was investigated by thermogravimetric analysis.(Al_2O_3–C)/Fe powders were heated under argon atmosphere at different heating rates in the thermal analyzer. The activation energies, Ea, the pre–exponential factor, A, and the reaction rate constants, k, were calculated. The reaction stages of(Al_2O_3–C)/Fe were also analyzed. The reaction are mainly solid–solid reaction between corundum and graphite at the first stage before iron melts. The reaction occurs in the solid–liquid reaction stage in the presence of iron liquid when iron powder completely melts. The result by thermogravimetric analysis indicates that the participation of iron liquid can accelerate the carbothermic reduction of alumina at a high temperature.
引文
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[3]THOMAS D,OLAF K,JURGEN P.Studies on the wear of submerged entry nozzles[C]//Proceedings of 47th international colloquium on refractories,Aachen,Germany:2004:38–41.
[4]朱芷颐.添加Ni、Co对Al2O3–C耐火材料显微组织结构及性能的影响[D].包头:内蒙古科技大学,2012.ZHU Zhiyi.Effect of Ni and Co addition on microstructure and properties of Al2O3–C refractories(in Chinese,dissertation).Baotou:Inner Mongolia University of Science and Technology,2012.
[5]ROBERT A F,CHARLES W F,JOHN F E,et al.Physical chemistry of the carbothermic reduction of alumina in the presence of a metallic solvent:PartⅡ.Measurements of kinetics of reaction[J].Metall Mater Trans B,1989,20B(4):161–173.
[6]RITA K,SOMYOTE K,SESHADRI S,et al.Carbothermic reductoin of alumina at 1873 K in the presence of molten steel:a sessile drop investigation[J].ISIJ Int,2012,52(6):992–999.
[7]RITA K,BRENTON R,FIONA M,et al.Dissolution of carbon from alumina carbon mixtures into liquid iron:influence of carbonaceous materials[J].Metall Mater Trans B,2006,37B(8):623–632.
[8]魏耀武,邵勇,熊玮,等.Al2O3–C/Fe系统中氧化铝的碳热还原反应机理研究[J].硅酸盐学报,2017,45(3):441–445.WEI Yaowu,SHAO Yong,XIONG Wei,et al.J Chin Ceram Soc,2017,45(3):441–445.
[9]WEI Yaowu,SHAO Yong,CHEN Junfeng,et al.Influence of carbonaceous materials on the interactions among(Al2O3–C)/Fe system with temperature and soaking time[J].J Eur Ceram Soc,2018,38:313–322.
[10]侯谨,王振祥,赵亮铝,等.碳滑板氧化动力学的研究[J].包钢科技,2005,31(2):20–22.HOU Jin,WANG Zhenxiang,ZHAO Lianglv,et al.Sci&Tech Baotou Steel Corp(in Chinese),2005,31(2):20–22.
[11]LI C E,BROWN T C.Carbon oxidation kinetics from evolved carbon oxide analysis during temperature–programmed oxidation[J].Carbon,2001,39(5):725–732.
[12]GUO W M,XIAO H N,ZHANG G J.Kinetics and mechanisms of non-isothermal oxidation of graphite in air[J].Corros Sci,2008,50(7):2007–2011.
[13]张延安,豆志河.宏观动力学研究方法[M].北京:化学工业出版社,2014:66–67.
[14]MUHAMMAD I,RITA K,PRAMOD K,et al.High-temperature interactions of alumina–carbon refractories with molten iron[J].ISIJ Int,2010,50(6):804–812.