Characteristics of reaction and product microstructure during light calcination of magnesite in transport bed

SUN Cong; YAN Bowei; CAI Changyong; HAN Zhennan; XU Guangwen

doi:10.11949/0438-1157.20200530

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Characteristics of reaction and product microstructure during light calcination of magnesite in transport bed

Energy and environmental engineering | 更新时间：2026-07-24

- Characteristics of reaction and product microstructure during light calcination of magnesite in transport bed
- CIESC Journal Vol. 71, Issue 12, Pages: 5735-5744(2020)
- 作者机构：
  
  1.沈阳化工大学能源与化工产业技术研究院，资源化工与材料教育部重点实验室，辽宁沈阳 110142
  2.中国科学院过程工程研究所多项复杂系统国家重点实验室，北京 100190
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20200530
  CLC： TQ 026.7
- Received：08 May 2020，
  
  Revised：2020-06-30，
  
  Online First：17 December 2020，
  
  Published：05 December 2020
- 稿件说明：
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孙聪, 闫博威, 蔡长庸, 韩振南, 许光文. 菱镁矿输送床轻烧过程反应与产物微观结构特性[J]. 化工学报, 2020, 71(12): 5735-5744

SUN Cong, YAN Bowei, CAI Changyong, HAN Zhennan, XU Guangwen. Characteristics of reaction and product microstructure during light calcination of magnesite in transport bed[J]. CIESC Journal, 2020, 71(12): 5735-5744
孙聪, 闫博威, 蔡长庸, 韩振南, 许光文. 菱镁矿输送床轻烧过程反应与产物微观结构特性[J]. 化工学报, 2020, 71(12): 5735-5744 DOI： 10.11949/0438-1157.20200530.

SUN Cong, YAN Bowei, CAI Changyong, HAN Zhennan, XU Guangwen. Characteristics of reaction and product microstructure during light calcination of magnesite in transport bed[J]. CIESC Journal, 2020, 71(12): 5735-5744 DOI： 10.11949/0438-1157.20200530.

摘要

利用高温烟气加热实验室规模输送床模拟菱镁矿闪速轻烧工业输送床反应器，建立基于热重分析计算菱镁矿中MgCO

分解率方法，研究了煅烧条件和原料粒径对菱镁矿细粉输送床分解的转化率和产品活性的影响，揭示了煅烧过程中产物微观结构变化特性。菱镁矿粉（

150 µm）轻烧为秒级快速反应，仅需1~2 s菱镁矿中MgCO

分解率即可达98%以上，验证了输送床闪速轻烧技术的可行性。输送床煅烧产物的柠檬酸显色时间17~55 s，活性显著高于固定床煅烧产物（显色时间294 s），且产物活性由菱镁矿分解率和微观结构共同决定；煅烧过程中产物MgO晶粒尺寸逐渐增大，表面结构由疏松多孔变为致密光滑，该结构变化可在数秒内完成。

Abstract

A gas-heating laboratory transport bed was adopted to simulate the industrial transportbed reactor for flash calcination of magnesite

and a method based on TG analysis of a reacted sample was further developed to calculate the decomposition rate or conversion of its containing MgCO

. The study investigated how the conversion and product reactivity as well as microstructure vary with reaction conditions including temperature

particle size and times of re-calcination for powder magnesite. Magnesite powder (

150 µm) calcination is a quick reaction that reaches 98% decomposition of its containing MgCO

in 1—2 s

corroborating the feasibility of magnesite flash-calcination in transport bed reactors. The coloration time given by the citric acid chromogenic method was 17—55 s and 294 s for the obtained products from transport and fixed beds

respectively. This proves the obviously higher activity and thus improved microstructure of the product from transport bed. During the calcination process

the MgO grain size of the product gradually increases

and the surface structure changes from loose and porous to dense and smooth. This structural change can be completed within a few seconds.

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references

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