Non-isothermal Reduction Kinetics of Carbon Coated Iron Powder
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摘要: 采用机械研磨的方法对磁铁矿粉进行碳包覆,在10 K/min的升温速率下分别对研磨时间为15、45、75、105 s的矿粉进行了差热分析;选用研磨时间为105 s的矿粉,在升温速率分别为5、10、15、20 K/min的条件下研究了包覆矿粉的失重变化规律,并采用FWO法和Coats-Redfern法对试验数据进行了分析处理,得到碳包覆磁铁矿粉的相关反应动力学参数。结果表明,在一定范围内碳包覆磁铁矿粉的失重与温度和研磨时间成正比。碳包覆磁铁矿粉发生固固反应的初始活化能为337 kJ/mol,反应模型为三维扩散模型,反应模型函数是。Abstract: Iron-carbon solid-solid reduction reaction has always been a challenge for researcher,therefore,studying the solid-solid reaction kinetics has important practical significance.The mechanical grinding method was used to coat the magnetite with carbon and the differential thermal analysis was conducted on the ore powders with the milling time of 15 s,45 s,75 s and 105 s at a heating rate of 10 K/min.The mineral powder with the milling time of 105 s was selected to study the change rule of weight loss of coated ore powder under the condition of heating rate of 5 K/min,10 K/min,15 K/min and 20 K/min.The FWO method and the Coats-Redfern method were used to analyze the experimental data to get the related kinetic parameters of carbon-coated slag.The experimental results show that the weight loss of carbon coated slag is proportional to the temperature and grinding time within a certain range.The initial activation energy of solidification reaction of carbonaceous coated iron ore powder is 337 kJ/mol,the reaction model is three-dimensional diffusion model,the reaction model function is.
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Key words:
- magnetite powder /
- reaction /
- carbon coating /
- non-isothermal /
- kinetics
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