无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (10): 50-55.doi: 10.19964/j.issn.1006-4990.2022-0696

• 研究与开发 • 上一篇    下一篇

抑制性气氛中菱镁矿分解特性与动力学研究

李希艳(), 张虹, 刘雪景(), 杨昊, 徐帅, 李佳欣, 解佳祺, 许光文   

  1. 沈阳化工大学资源化工与材料教育部重点实验室,辽宁 沈阳 110142
  • 收稿日期:2022-11-24 出版日期:2023-10-10 发布日期:2023-10-16
  • 通讯作者: 刘雪景(1986— ),女,讲师,博士,研究方向为微型流化床反应分析仪在气固反应中的应用;E-mail:liuxuejing6@163.com
  • 作者简介:李希艳(1997— ),女,硕士研究生,研究方向为菱镁矿分解反应特性及动力学研究;E-mail:1378790487@qq.com
  • 基金资助:
    国家重点研发计划项目(2022YFF0705100);辽宁省科技厅自然科学基金项目(2020-MS-231)

Study on decomposition characteristic and kinetics of magnesite in inhibitory atmosphere

LI Xiyan(), ZHANG Hong, LIU Xuejing(), YANG Hao, XU Shuai, LI Jiaxin, XIE Jiaqi, XU Guangwen   

  1. Key Laboratory on Resources Chemicals and Material of Ministry of Education,ShenyangUniversity of Chemical Technology,Shenyang 110142,China
  • Received:2022-11-24 Published:2023-10-10 Online:2023-10-16

摘要:

利用热重分析仪研究了菱镁矿在含产物(CO2)抑制性气氛中的分解反应特性,并根据Flynn-Wall-Ozawa法和Coats-Redfern法计算获得了反应动力学参数。结果表明:随着反应气氛中CO2浓度的增加,菱镁矿分解受到的抑制作用显著增强,初始分解温度与反应活化能呈对数型增加,最大反应速率对应温度则呈指数型增加;在含不同浓度的CO2气氛中菱镁矿分解均遵循成核与生长控制模型Gx)=-ln(1-x)。该论文为实际工业生产中菱镁矿煅烧及资源利用提供了理论依据。

关键词: 热重分析, 菱镁矿, 抑制气氛, 反应动力学, 分解

Abstract:

Decomposition reaction characteristic of magnesite in the inhibitory atmosphere containing product gases was investigated by thermogravimetric analyzer(TGA).The kinetic parameters were calculated based on the Flynn-Wall-Ozawa and Coats-Redfern methods.It was shown that the decomposition of magnesite was seriously inhibited as CO2 concentration increasing.Both the initial decomposition temperature and apparent activation energy were increased logarithmically but the temperature corresponding to the maximum reaction rate was increased exponentially with increasing CO2 concentration.The decomposition of magnesite in the atmosphere with different CO2 concentrations was followed the nucleation and growth control model Gx)=-ln(1-x).This study would provide basic theoretical data for magnesite calcination and resource utilization in actual industry.

Key words: thermogravimetry, magnesite, inhibitory atmosphere, reaction kinetics, decomposition

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