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

doi:10.1016/j.cjche.2019.02.024

	Relationship between pore structure and hydration activity of CaO from carbide slag
	Zhang, Junqiang 1; Zhang, Shu 4; Zhong, Mei 3; Wang, Zhi 1; Qian, Guoyu 1; Liu, Junhao 1; Gong, Xuzhong 1,2
刊名	CHINESE JOURNAL OF CHEMICAL ENGINEERING
	2019-11-01
卷号	27 期号:11 页码:2771-2782
关键词	Carbide slag CaO Hydration activity Sintering Pore volume fraction
ISSN号	1004-9541
DOI	10.1016/j.cjche.2019.02.024
英文摘要	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 CaCO3 to CS effectively inhibits the sintering of CS-CaO and improves VF200. Consequently, the hydration activity of CS-CaO increased from 22.79 degrees C. min(-1) to 27.19 degrees C. min(-1) and to 29.27 degrees C. min(-1) with addition of 5% graphite or 5% CaCO3 into carbide slag, respectively. (C) 2019 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China[U1610101] ; National Natural Science Foundation of China[51422405]
WOS关键词	CO2 CAPTURE PERFORMANCE ; LIMESTONE CALCINATION ; POSTCOMBUSTION CO2 ; BY-PRODUCT ; CALCIUM ; SORBENT ; CARBONATION ; HCL ; TEMPERATURE ; COMBUSTION
WOS研究方向	Engineering
语种	英语
出版者	CHEMICAL INDUSTRY PRESS CO LTD
WOS记录号	WOS:000506862600018
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/38714]
专题	中国科学院过程工程研究所
通讯作者	Zhang, Shu; Gong, Xuzhong
作者单位	1.Chinese Acad Sci, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Inst Proc Engn, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100190, Peoples R China 3.Xinjiang Univ, Coll Chem & Chem Engn, Key Lab Coal Clean Convers & Chem Engn Proc Xinji, Urumqi 830046, Peoples R China 4.Nanjing Forestry Univ, Coll Mat Sci & Engn, Nanjing 210037, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Junqiang,Zhang, Shu,Zhong, Mei,et al. Relationship between pore structure and hydration activity of CaO from carbide slag[J]. CHINESE JOURNAL OF CHEMICAL ENGINEERING,2019,27(11):2771-2782.
APA	Zhang, Junqiang.,Zhang, Shu.,Zhong, Mei.,Wang, Zhi.,Qian, Guoyu.,...&Gong, Xuzhong.(2019).Relationship between pore structure and hydration activity of CaO from carbide slag.CHINESE JOURNAL OF CHEMICAL ENGINEERING,27(11),2771-2782.
MLA	Zhang, Junqiang,et al."Relationship between pore structure and hydration activity of CaO from carbide slag".CHINESE JOURNAL OF CHEMICAL ENGINEERING 27.11(2019):2771-2782.