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›› 2014, Vol. 14 ›› Issue (6): 973-978.

• 过程与工艺 • 上一篇    下一篇

微波场中生物炭还原褐铁矿反应动力学实验及模型计算

李解 韩磊 李保卫 王介良 祖刚 杨仲禹   

  1. 内蒙古科技大学白云鄂博矿多金属资源综合利用国家重点实验室 内蒙古科技大学白云鄂博矿多金属资源综合利用国家重点实验室 内蒙古科技大学能源与环境学院 内蒙古科技大学能源与环境学院 内蒙古科技大学能源与环境学院 内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室
  • 收稿日期:2014-12-26 修回日期:1900-01-01 出版日期:2014-12-20 发布日期:2014-12-20
  • 通讯作者: 李解

Kinetic Experiment and Modelling of Reduction Reaction of Limonite with Biochar in Microwave Field

LI Jie HAN Lei LI Bao-wei WANG Jie-liang ZU Gang YANG Zhong-yu   

  1. Key Laboratory of Integrated Exploitation of Bayan Obo Multi-metal Resources, Inner Mongolia University of Science and Technology Key Laboratory of Integrated Exploitation of Bayan Obo Multi-metal Resources, Inner Mongolia University of Science and Technology School of Energy amd Environment，University of Science and Technology Inner Mongolia School of Energy amd Environment，University of Science and Technology Inner Mongolia School of Energy amd Environment，University of Science and Technology Inner Mongolia Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources
  • Received:2014-12-26 Revised:1900-01-01 Online:2014-12-20 Published:2014-12-20
  • Contact: LI Jie

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被引次数

6

摘要： 采用微波失重在线检测装置和XRD分别分析了褐铁矿与生物炭升温至923 K的失重变化及微波焙烧前后的矿相变化；同时基于褐铁矿微波还原焙烧升温失重曲线，采用Achar-Brindley-Sharp-Wendworth微分法和Coats-Redfern积分法，计算了褐铁矿在不同温度段的反应动力学参数. 结果表明，褐铁矿与生物炭在923 K的还原温度下转变为磁铁矿，同时生成少量的硅酸亚铁(Fe2SiO4)；其微波还原焙烧过程分为3个阶段进行，在366~470 K，反应的表观活化能(E1)分别为30.7和26.3 kJ/mol，反应机理符合反应级数函数，属于化学反应控制；在470~650 K，表观活化能(E2)分别为40.3和33.1 kJ/mol，反应机理符合Avrami-Erofeer函数，是随机成核和随后生长的化学反应控制；在650~825 K，表观活化能(E3)分别为52.4 和52.9 kJ/mol，反应机理符合Zhuralev-Lesokin-Tempelman函数，属于三维扩散控制.

关键词: 褐铁矿, 生物炭, 还原焙烧, 微波, 动力学, 表观活化能

Abstract: The changes of weight loss and mineral phase of limonite with biochar before and after microwave roasting were measured at 923 K. Based on the curves of rising temperature and weight loss of reduction roasting by microwave heating, the reaction kinetics parameters of limonite in different temperature periods were calculated by Achar-Brindley-Sharp-Wendworth differentiation method and Coats-Redfern integration method. The results showed that the limonite reduced by biochar changed into magnetite at 923 K, and produced little ferrous silicate (Fe2SiO4) in roasted ore. And the reduction roasting process of limonite with biochar by microwave heating was divided into three temperature stages. The apparent activation energy (E1) was 30.7 and 26.3 kJ/mol in 366~470 K respectively, and the reaction mechanism accorded with reaction order function, belonging to the chemical reaction control. In 470~650 K, the apparent activation energy (E2) was 40.3 and 33.1 kJ/mol respectively, the reaction mechanism accorded with Avrami-Erofeev function, belonging to the chemical reaction control of stochastic coring and afterward growing up. But in 650 ~825 K, the apparent activation energy (E3) was 52.4 and 52.9 kJ/mol respectively, and the reaction mechanism accorded with Zhuralev-Lesokin-Tempelman function, belonging to the three-dimensional diffusion control.

Key words: limonite, biochar, reduction roasting, microwave, kinetics, apparent activation energy

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