Relationship between pore structure and hydration activity of CaO from carbide slag

Junqiang Zhang; Shu Zhang; Mei Zhong; Zhi Wang; Guoyu Qian; Junhao Liu; Xuzhong Gong

doi:10.1016/j.cjche.2019.02.024

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Relationship between pore structure and hydration activity of CaO from carbide slag

Energy, Resources and Environmental Technology | Updated：2026-01-06

- Relationship between pore structure and hydration activity of CaO from carbide slag
- Chinese Journal of Chemical Engineering Vol. 27, Issue 11, Pages: 2771-2782(2019)
- Affiliations：
  
  1. Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences,Beijing,China,100190
  2. College of Materials Science and Engineering, Nanjing Forestry University,Nanjing,China,210037
  3. Key Laboratory of Coal Clean Conversion & Chemical Engineering Process(Xinjiang Uyghur Autonomous Region), College of Chemistry and Chemical Engineering, Xinjiang University,Urumqi,China,830046
  4. University of Chinese Academy of Sciences,Beijing,China,100190
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2019.02.024
  CLC：
- Published：2019
- Accepted：
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Junqiang Zhang, Shu Zhang, Mei Zhong, Zhi Wang, Guoyu Qian, Junhao Liu, Xuzhong Gong. Relationship between pore structure and hydration activity of CaO from carbide slag[J]. Chinese Journal of Chemical Engineering, 2019, 27(11): 2771-2782.
DOI：

Junqiang Zhang, Shu Zhang, Mei Zhong, Zhi Wang, Guoyu Qian, Junhao Liu, Xuzhong Gong. Relationship between pore structure and hydration activity of CaO from carbide slag[J]. Chinese Journal of Chemical Engineering, 2019, 27(11): 2771-2782. DOI： 10.1016/j.cjche.2019.02.024.

摘要

Abstract

CaO needs to show high activity to be used as Ca-sorbent and slagging agent. Hydration activity is an important characteristic to evaluate the activity of CaO. In this study

carbide slag from polyvinyl chloride (PVC) industry was utilized as precursor for preparing high activity CaO. The roles of crystallite grain

average pore diameter (APD) and volume fraction of pore 200 nm in diameter (VF200) in hydration activity of CaO from carbide slag (CS-CaO) were respectively investigated. The hydrolysis kinetics model of CaO shows a three-dimensional spherically symmetric diffusion model (D4)

which suggests that hydration activity was mainly associated with APD and VF200 of CS-CaO with limited correlation to the crystal size. Specifically

the hydration activity of CS-CaO is increased with increasing VF200

while decreased with increasing APD. Under the invariable calcination temperature

the core-shell structure formed by the addition of graphite or CaCO

to CS effectively inhibits the sintering of CS-CaO and improves VF200. Consequently

the hydration activity of CS-CaO increased from 22.79℃·min

-1

to 27.19℃·min

-1

and to 29.27℃·min

-1

with a

ddition of 5% graphite or 5% CaCO

into carbide slag

respectively.

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