Non-isothermal reduction kinetics of titanomagnetite by hydrogen
来源期刊：International Journal of Minerals Metallurgy and Materials2013年第12期
论文作者：Jie Dang Guo-hua Zhang Xiao-jun Hu Kuo-chih Chou
文章页码：1134 - 1140
摘 要：Reduction of titanomagnetite（TTM）powders by H2-Ar gas mixtures was investigated under a non-isothermal condition by using a thermogravimetric analysis system.It was found that non-isothermal reduction of TTM proceeded via a dual-reaction mechanism.The first reaction was reduction of TTM to wu¨stite and ilmenite,whereas the second one was reduction of wu¨stite and ilmenite to iron and titanium dioxide.By using a new model for the dual reactions,which was in an analytical form and incorporated different variables,such as time,temperature,particle size,and hydrogen partial pressure,rate-controlling steps for the dual reactions were obtained with the apparent activation energies calculated to be 90-98 and 115-132 kJ/mol for the first and second reactions,respectively.
Jie Dang1,2，Guo-hua Zhang1,2，Xiao-jun Hu1,2，Kuo-chih Chou1,2
1. State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing2. School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing
摘 要：Reduction of titanomagnetite（TTM）powders by H2-Ar gas mixtures was investigated under a non-isothermal condition by using a thermogravimetric analysis system.It was found that non-isothermal reduction of TTM proceeded via a dual-reaction mechanism.The first reaction was reduction of TTM to wu¨stite and ilmenite,whereas the second one was reduction of wu¨stite and ilmenite to iron and titanium dioxide.By using a new model for the dual reactions,which was in an analytical form and incorporated different variables,such as time,temperature,particle size,and hydrogen partial pressure,rate-controlling steps for the dual reactions were obtained with the apparent activation energies calculated to be 90-98 and 115-132 kJ/mol for the first and second reactions,respectively.
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