Exploring influence of MgO/CaO on crystallization characteristics to understand fluidity of synthetic coal slags

Meng Li; Jianliang Xu; Huixia Xiao; Xia Liu; Guangsuo Yu; Xueli Chen

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Exploring influence of MgO/CaO on crystallization characteristics to understand fluidity of synthetic coal slags

Full Length Article | Updated：2026-01-06

- Exploring influence of MgO/CaO on crystallization characteristics to understand fluidity of synthetic coal slags
- Chinese Journal of Chemical Engineering Vol. 53, Issue 1, Pages: 1-13(2023)
- Affiliations：
  
  1. Institute of Clean Coal Technology, East China University of Science and Technology,Shanghai,China,200237
  2. State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University,Yinchuan,China,750021
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2023
- Accepted：
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Meng Li, Jianliang Xu, Huixia Xiao, Xia Liu, Guangsuo Yu, Xueli Chen. Exploring influence of MgO/CaO on crystallization characteristics to understand fluidity of synthetic coal slags[J]. Chinese Journal of Chemical Engineering, 2023, 53(1): 1-13.
DOI：

Meng Li, Jianliang Xu, Huixia Xiao, Xia Liu, Guangsuo Yu, Xueli Chen. Exploring influence of MgO/CaO on crystallization characteristics to understand fluidity of synthetic coal slags[J]. Chinese Journal of Chemical Engineering, 2023, 53(1): 1-13. DOI：

摘要

Abstract

The crystallization has significant influence on fluidity of slag and slag discharge of entrained-flow-bed (EFB) gasifier. The crystallization characteristics and fluidity of five synthetic slags with different MgO/CaO ratios prepared on the basis of the range of oxide contents of Zhundong coal ash were investigated in this study. The results show that with the MgO/CaO ratio increase

the initial crystallization temperature increases

and the main temperature range of crystallization ratio growth moves to higher temperature range gradually which causes

p25

(

p25

is the temperature corresponding to the viscosity of 25 Pa·s) to increase. Mg-rich crystals are formed preferentially than Ca-rich crystals when adding the same amount of MgO and CaO during cooling. The effective slagging operating temperature range decrease from 217 ℃ for the slag with a 0:4 MgO/CaO ratio to 44 ℃ for the slag with a 4:0 MgO/CaO ratio with the MgO/CaO ratio increase. The slags with 2:2 and 1:3 MgO/CaO ratios show similar effective slagging operating temperature range

p25

and the temperature corresponding to the viscosity of 2 Pa·s. However

compared with the slag with a 1:3 M

gO/CaO ratio

the crystallization ratio and rate of slag with a 2:2 MgO/CaO ratio are lower within lower temperature range (1300–1200 ℃)

causing its lower critical viscosity temperature and wider actual operating temperature range. Of the five slags

the widest effective slagging operating temperature range and the lowest

p25

of the slag with a 0:4 MgO/CaO ratio due to its low crystallization ratio

and wider actual operating temperature range of the slag with a 2:2 MgO/CaO ratio make the two slags suitable for slag discharge of EFB gasifier.

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