菱铁矿热分解过程中FeO磁化反应动力学研究
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摘要
为研究菱铁矿热分解过程中FeO磁化反应,给菱铁矿悬浮磁化焙烧工艺优化提供理论指导,采用气体成分分析系统对菱铁矿热分解过程中FeO磁化反应动力学进行了研究。结果表明,随着磁化反应温度的升高,达到相同反应分数所需时间逐渐缩短,反应速率的峰值逐渐升高。不同磁化反应温度下,反应分数及反应速率均随时间的变化呈现出相似的规律。同时,采用模型匹配法对试验数据分析表明:FeO磁化反应动力学符合G(α)=[-ln(1-α)]21动力学模型,其表观活化能为56.01 kJ/mol,指前因子A为6.07 s-1。菱铁矿热分解过程中FeO磁化反应过程的限制环节为气体扩散与界面反应控制。
In order to study themagnetization reaction of FeO in the thermal decomposition process of siderite,and pro?vide theoretical guidance for the optimization of the magnetron roasting process of siderite,the kinetics of FeO magnetization in the thermal decomposition of siderite was studied by gas composition analysis system. The results showed that With the in?crease of reaction temperature, the time to realize same reaction fraction become shorter, and the magnetization reaction rate increase with temperature increases. Under different magnetization reaction temperatures,the reaction fraction showed a simi?lar law with time;the magnetization reaction rate changed the same with the reaction fraction. At the same time,the model da?ta was analyzed by model matching method indicated kinetics of FeO magnetization reaction was in accordance with the kinet?ic model equation: G(α)=[-ln(1-α)]21,and the magnetization of the reaction kinetics FeO activation energy was 56.01 kJ/mol,A was 6.07 s-1. The limiting part of FeO magnetization reaction process in the thermal decomposition process of siderite is gas diffusion and interface reaction control.
In order to study themagnetization reaction of FeO in the thermal decomposition process of siderite,and pro?vide theoretical guidance for the optimization of the magnetron roasting process of siderite,the kinetics of FeO magnetization in the thermal decomposition of siderite was studied by gas composition analysis system. The results showed that With the in?crease of reaction temperature, the time to realize same reaction fraction become shorter, and the magnetization reaction rate increase with temperature increases. Under different magnetization reaction temperatures,the reaction fraction showed a simi?lar law with time;the magnetization reaction rate changed the same with the reaction fraction. At the same time,the model da?ta was analyzed by model matching method indicated kinetics of FeO magnetization reaction was in accordance with the kinet?ic model equation: G(α)=[-ln(1-α)]21,and the magnetization of the reaction kinetics FeO activation energy was 56.01 kJ/mol,A was 6.07 s-1. The limiting part of FeO magnetization reaction process in the thermal decomposition process of siderite is gas diffusion and interface reaction control.
引文
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[3]余永富.我国铁矿资源有效利用及选矿发展的方向[J].金属矿山,2001(2):9-11.Yu Yongfu.Effective utilization of iron ore resources in China and direction of mineral processing developmen[tJ].Metal Mine,2001(2):9-11.
[4]袁志涛,高太,印万忠,等我国难选铁矿石资源利用的现状及发展方向[J]金属矿山,2007(1):1-6.Yuan Zhitao,Gao Tai,Yin Wanzhong,et al.Current status and development direction of refractory iron ore resource utilization in China[J]Metal Mine,2007(1):1-6.
[5]李艳军,杨光,赵瑞超,等.含菱铁矿难选铁矿石的特点及选矿技术研究趋势[J].矿产综合利用,2015(2):12-16.Li Yanjun,Yang Guang,Zhao Ruichao,et al.Characteristics ofrefractory iron ore containing siderite and research trend of mineral processing technology[J].Comprehensive Utilization of Mineral Resources,2015(2):12-16.
[6]Chun T,Zhu D,Pan J.Simultaneously roasting and magnetic separation to treat low grade siderite and hematite ores[J].Mineral Processing and Extractive Metallurgy Review,2015,36(4):223-226.
[7]Luo L,Huang H,Yu Y.Characterization and technology of fast reducing roasting for fine iron materials[J].Journal of Central South University,2012,19:2272-2278.
[8]李忠仙.王家滩菱铁矿开发利用研究回顾[J].现代矿业,2010(9):93-94.Li Zhongxian.Review of research and development of Wangjiatanlingtie Mine[J].Modern Mining,2010(9):93-94.
[9]朱德庆,何威,潘建,等.新疆某菱铁矿磁化焙烧-磁选试验[J].金属矿山,2012(5):79-81.Zhu Deqing,He Wei,Pan Jian,et al.Magnetization roasting-magnetic separation test of a siderite in Xinjiang[J].Metal Mine,2012(5):79-81.
[10]杨龙.提高梅山选矿厂弱磁性铁矿物利用效率研究[D].沈阳:东北大学,2013.Yang Long.Improving the Utilization Efficiency of Weak Magnetic Iron Minerals in Meishan Concentrator[D].Shenyang:Northeastern University,2013.
[11]王秋林,陈雯,余永富,等.难选铁矿石磁化焙烧机理及闪速磁化焙烧技术[J].金属矿山,2009(12):73-76.Wang Qiulin,Chen Wen,Yu Yongfu,et al.Magnetization roasting mechanism of refractory iron ore and flash magnetization roasting technology[J].Metal Mine,2009(12):73-76.
[12]冯志力.菱铁矿热解动力学及其多级循环流态化磁化焙烧的数值模拟和试验研究[D].武汉:华中科技大学,2011.Feng Zhili.Numerical Simulation and Experimental Study of Pyrolysis Kinetics and Multi-stage Circulating Fluidized Magnetization Roasting[D].Wuhan:Huazhong University of Science and Technology,2011.
[13]Gotor F J,Macías M,Ortega A,et al.Comparative study of the kinetics of the thermal decomposition of synthetic and natural siderite samples[J].Physics&Chemistry of Minerals,2000,27:495-503.
[14]Gallagher P K,Warne S S J.Thermomagnetometry and thermal decomposition of siderite[J].Thermochimica Acta,1981,43(3):253-267.
[15]Michael J Tiernan,Philip A Barnes,Parkes G M B.Reduction of iron oxide catalysts:the investigation of kinetic parameters using rate perturbation and linear heating thermoanalytical techniques[J].Journal of Physical Chemistry B,2001,105(1):220-228.