DOI: 10.1016/j.jcou.2018.07.015
Scopus记录号: 2-s2.0-85051211128
论文题名: Experiment and kinetic modeling for leaching of blast furnace slag using ligand
作者: Seo S.-K. ; Kwon C.-M. ; Kim F.S. ; Lee C.-J.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 27 起始页码: 188
结束页码: 195
语种: 英语
英文关键词: CO2 sequestration
; Extraction
; Ligand
; Mineral carbonation
; Slag
Scopus关键词: Activation energy
; Blast furnaces
; Calcium carbonate
; Carbon dioxide
; Carbonation
; Citric acid
; Kinetic theory
; Ligands
; Particle size
; Particle size analysis
; Slags
; Solvents
; Surface reactions
; Carbonation process
; CO2 sequestration
; Extraction efficiencies
; Mineral carbonation
; Precipitated calcium carbonate
; Shrinking core model
; Solid-to-liquid ratio
; Surface chemical reactions
; Extraction
英文摘要: Blast furnace (BF) slag is recognized as an excellent source of precipitated calcium carbonate (PCC) and CO2 sequestrating agents because it contains a significant amount of calcium. The pH-swing method is a promising process for commercialization of the slag carbonation process among the other indirect carbonation methods due to the high selectivity of calcium extraction and production of high quality PCC. In this study, ligand-based solvents, such as acetic acid, gluconic acid, and citric acid, were examined as new leachates for the extraction step in the pH-swing process. Citric acid showed the highest efficiency, and the extraction efficiencies were estimated based on particle size distribution, concentration of solvent, solid-to-liquid ratio, stirring speed, and temperature. The calcium extraction rate increased with decreasing particle size and S/L ratio and with increasing concentration of solvent and stirring speed. However, extraction efficiency decreased significantly at high temperature because calcium-citrate complexes were precipitated. Along with the experiments, a kinetic study based on the shrinking core model was carried out at temperatures lower than 30 °C. Our results demonstrated that the extraction process was controlled by a surface chemical reaction, and the activation energy was estimated to be 50.74 kJ mol-1. © 2018 Published by Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111801
Appears in Collections: 气候减缓与适应
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作者单位: School of Chemical Engineering and Materials Science, Chung-Ang University, 84 Heuksuk-ro, Dongjak-gu, Seoul, 06974, South Korea
Recommended Citation:
Seo S.-K.,Kwon C.-M.,Kim F.S.,et al. Experiment and kinetic modeling for leaching of blast furnace slag using ligand[J]. Journal of CO2 Utilization,2018-01-01,27