Isothermal Reduction Kinetics of Carbon Coated Iron Ore Powder
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摘要: 研究了碳包覆磁铁矿粉等温还原速率的最佳影响因素,试验以烟煤与无烟煤为碳源,采用研磨时间为105 s的碳包覆磁铁矿粉,利用自制的动态还原反应炉分别测试以烟煤和无烟煤为碳源包覆磁铁矿粉在不同温度下的失重状态;结合多相反应速率方程做出三种限制性因素下的速率方程,通过线性拟合得出方程的拟合曲线相关系数和速率常数k,再结合最大似然法得出D3模型为最佳模型,即以气相扩散为限制性环节,模型方程为G(α)=[1-(1-α)1/3]2,计算得出的烟煤碳包覆还原反应活化能Ea为52.317 kJ/mol。Abstract: In this paper the influence factors achieving optimum carbon coated magnetite isothermal reduction rate had been studied.Bituminous coal and anthracite were used as carbon source,and carbon-coated ore powder with a grinding time of 105 s had been used for test in a modified dynamic reduction reactor.Weight loss state of iron ore powder coated with carbon source at different temperatures for both bituminous and anthracite were measured.The rate equations under three restrictive factors are combined with the multiphase reaction rate equation.The fitting curve and the rate constant k of the equation are obtained by linear fitting.Then the maximum likelihood method is used to obtain the D3 model as the best model.That is,the gas phase is a restrictive link,and the developed model equation is G(α)=[1-(1-α)1/3]2.Based on the developed model he calculated activation energy Ea is 52.317 kJ/mol.
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Key words:
- magnetite powder /
- bituminous coal /
- anthracite /
- carbon coated /
- kinetics
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