Zhang Junqiang1; Zhang Shu2; Zhong Mei3; Wang Zhi1; Qian Guoyu1; Liu Junhao1; Gong Xuzhong1
Source Publicationchinesejournalofchemicalengineering
AbstractCaO 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 3 to CS effectively inhibits the sintering of CS-CaO and improves VF200. Consequently, the hydration activity of CS-CaO increased from 22.79?°C·min ?1 to 27.19?°C·min ?1 and to 29.27?°C·min ?1 , with addition of 5% graphite or 5% CaCO 3 into carbide slag, respectively.
Document Type期刊论文
First Author Affilication中国科学院过程工程研究所
Recommended Citation
GB/T 7714
Zhang Junqiang,Zhang Shu,Zhong Mei,et al. relationshipbetweenporestructureandhydrationactivityofcaofromcarbideslag[J]. chinesejournalofchemicalengineering,2019,27(11):2771.
APA Zhang Junqiang.,Zhang Shu.,Zhong Mei.,Wang Zhi.,Qian Guoyu.,...&Gong Xuzhong.(2019).relationshipbetweenporestructureandhydrationactivityofcaofromcarbideslag.chinesejournalofchemicalengineering,27(11),2771.
MLA Zhang Junqiang,et al."relationshipbetweenporestructureandhydrationactivityofcaofromcarbideslag".chinesejournalofchemicalengineering 27.11(2019):2771.
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