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过程工程学报 ›› 2015, Vol. 15 ›› Issue (3): 451-456.DOI: 10.12034/j.issn.1009-606X.215162

• 过程与工艺 • 上一篇    下一篇

纤维素-半纤维素混合物焙烧还原低品位软锰矿的动力学

龙云飞 吕奕菊 苏静 吕小艳 文衍宣   

  1. 广西大学化学化工学院 桂林理工大学化学与生物工程学院 广西大学化学化工学院 广西大学新农村发展研究院 广西大学化学化工学院
  • 收稿日期:2015-03-19 修回日期:2015-04-09 出版日期:2015-06-20 发布日期:2015-06-20
  • 通讯作者: 文衍宣

Roasting Reduction Kinetics of Low-grade Pyrolusite with the Mixture of Cellulose and Hemicellulose

LONG Yun-fei LV Yi-ju SU Jing LV Xiao-yan WEN Yan-xuan   

  1. School of Chemistry and Chemical Engineering, Guangxi University College of Chemistry and Bioengineering, Guilin University of Technology School of Chemistry and Chemical Engineering, Guangxi University The new rural development research institute, Guangxi University School of Chemistry and Chemical Engineering, GX University
  • Received:2015-03-19 Revised:2015-04-09 Online:2015-06-20 Published:2015-06-20
  • Contact: WEN Yan-xuan

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被引次数

1

摘要： 采用TG-DTG和XRD研究了纤维素、半纤维素及其混合物焙烧还原软锰矿的动力学. 结果表明，与非生物质类还原剂相比，纤维素、半纤维素及其混合物可在低于773 K焙烧还原软锰矿，纤维素和半纤维素单独焙烧还原软锰矿的动力学可采用在JMA方程基础上提出的经验动力学函数a=1-exp{-k0exp(-Ea/RT)[(T-T0)/b]n}描述，表观活化能Ea分别为38.66和30.14 kJ/mol. 混合物还原软锰矿过程的动力学可用单一组分动力学的线性加和表示，即转化率a=Sixiaie(T-T0,i)，且Sixi=1, 式中e(T-T0)是单位阶跃函数，用于避免产生无效的转化率数据.

关键词: 软锰矿, 还原, 动力学, 生物质, 纤维素, 半纤维素

Abstract: The reduction kinetics of pyrolusite by cellulose and hemicellulose, and their mixture was investigated by TG/DTG and XRD. The results show that compared with the non-biomass reducing agents, pyrolusite can be reduced below 773 K which is close to that of biomass reducing agents. The respective reduction processes follow the empirical equation a=1-exp{-k0exp(-Ea/RT)[(T-T0)/b]n}, and the apparent activation energy is 38.66 and 30.14 kJ/mol for the reduction of pyrolusite by cellulose and hemicellulose, respectively. The reduction kinetics of pyrolusite by the mixture can be described by the summation of the respective kinetics by considering their mass-loss fractions a=Sixiaie(T-T0,i) with Sixi=1, where e(T-T0) is the unit step function to avoid the invalid conversion data.

Key words: pyrolusite, reduction, kinetics, biomass, cellulose, hemicellulose

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