Kinetics and mechanism of carbothermic reduction of magnesia

被引:13
|
作者
Li Rongti
Pan Wei
Masamichi Sano
机构
[1] Tsinghua University,the Department of Materials Science and Engineering
[2] Nagoya University,the Department of Materials Process Engineering, Graduate School of Engineering
关键词
Material Transaction; Carbon Particle; Reduction Ratio; Graphite Powder; Carbothermic Reduction;
D O I
10.1007/s11663-003-0069-y
中图分类号
学科分类号
摘要
The reaction between MgO and graphite powders under flowing argon atmosphere was studied using a dynamic thermogravimetric method. In the temperature range 293 to 1973 K, the effects of compacting pressure, magnesia/carbon ratio, heating rate, Ar carrier-gas flow rate, and CO-partial pressure were investigated. An experimentally determined reaction mechanism was proposed and discussed. The reduction process could be divided into two stages. The first stage includes the direct reaction between MgO and graphite particles and partial gas-solid reaction at relatively low temperature (below 1750 K). The overall reaction rate depends on the solid phase-boundary reaction between magnesia and carbon particles. The second stage is the gas-solid reaction between CO and MgO, which determines the overall reaction rate. The apparent activation energies of the two stages were estimated to be 208.29 and 374.13 kJ/mol, respectively.
引用
收藏
页码:433 / 437
页数:4
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