Non-isotherm kinetics of iron oxide reduction by graphite

YAO Meiqin; YU Jian; GUO Feng; XU Guangwen

doi:10.3969/j.issn.0438-1157.2013.06.024

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Non-isotherm kinetics of iron oxide reduction by graphite

更新时间：2025-12-10

- Non-isotherm kinetics of iron oxide reduction by graphite
- CIESC Journal Issue 6, Pages: 2072-2079(2013)
- 作者机构：
  
  1. 中国科学院过程工程研究所多相复杂系统国家重点实验室,北京,100190
  2. 中国科学院研究生院,北京,100039
  3. 中国矿业大学(北京)化学与环境工程学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.06.024
  CLC： 643TQ138.1
- Online First：05 June 2013，
  
  Published：05 June 2013
- 稿件说明：
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YAO Meiqin, YU Jian, GUO Feng, et al. Non-isotherm kinetics of iron oxide reduction by graphite[J]. CIESC Journal, 2013, (6): 2072-2079.
DOI：

YAO Meiqin, YU Jian, GUO Feng, et al. Non-isotherm kinetics of iron oxide reduction by graphite[J]. CIESC Journal, 2013, (6): 2072-2079. DOI： 10.3969/j.issn.0438-1157.2013.06.024.

摘要

准确测试固固反应

如铁矿炭还原反应的动力学在科学研究和实际应用中均具有重要意义。利用热重程序升温的方法研究了氧化铁石墨还原的固固反应特性

在惰性气氛下分别考察了研磨与浸渍混合后焙烧制得的Fe2O3/C样品的失重曲线

采用Flynn-Wall-Ozawa公式和Coats-Redfern公式相结合的方法分别求算了两种混合样品的固固反应动力学参数

研究发现氧化铁在炭表面的聚集形态与其活化能变化规律直接相关

且浸渍焙烧法所得样品的活化能符合强吸热反应活化能变化规律。结合固体原位XRD表征与气体产物在线分析手段

发现在初始阶段Fe2O3即可与C直接反应生成Fe3O4和CO2。该反应的活化能约为530 kJ·mol-1

反应机理为二级化学反应模型。

Abstract

The accurate measurement of solid-solid reaction kinetics

such as reduction of iron oxide by carbon

is of great significance in scientific research and practical applications.In this paper solid-solid reaction characteristics between iron oxide and graphite was studied using thermogravimeter (TG) measurement for both samples prepared respectively by directly mixing and grinding graphite and Fe2O3 as well as by impregnating Fe2O3 on the graphite.Their reaction kinetic parameters were calculated using the Flynn-Wall-Ozawa and Coats-Redfern equations.The variation trends of activation energy are related with the aggregation morphology of Fe2O3 on the surface of carbon.The reduction kinetics for impregnated sample is of the characteristics of strong endothermic reaction.Combining the results of XRD characterization and online gas determination

in the initial stage of Fe2O3 reduction the products are Fe3O4 and CO2

reaction follows second order reaction mechanism and activation energy is about 530 kJ·mol-1.

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