DOI: 10.1016/j.jcou.2019.02.014
Scopus记录号: 2-s2.0-85062715520
论文题名: Experimental study on the extraction of calcium, magnesium, vanadium and silicon from steelmaking slags for improved mineral carbonation of CO 2
作者: Owais M. ; Järvinen M. ; Taskinen P. ; Said A.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2019
卷: 31 起始页码: 1
结束页码: 7
语种: 英语
英文关键词: Ca-extraction
; Mineral carbonation
; Slag2PCC process
; Steel slag
Scopus关键词: Calcite
; Calcium carbonate
; Carbon dioxide
; Carbonation
; Chlorine compounds
; Efficiency
; Leaching
; Magnesium
; Mass transfer
; Particle size
; Silicon
; Slags
; Solvent extraction
; Solvents
; Steelmaking
; Vanadium
; Ammonium chloride
; Extraction efficiencies
; Mineral carbonates
; Mineral carbonation
; Optimal concentration
; Precipitated calcium carbonate
; Solvent concentration
; Steel slag
; Nitrogen compounds
英文摘要: In this paper X2PCC (Calcium containing material X to Precipitated Calcium Carbonate) process wherein a steelmaking slag is used as a source of Ca for mineral carbonation of CO 2 was studied. Mineral carbonation refers to binding of CO 2 into mineral carbonates, here CaCO 3 . In the process, we first dissolve Ca selectively from the slag, then separate the solid phase and finally, bubble CO 2 into the solution to make precipitated calcium carbonate CaCO 3 . Based on our current understanding, the extraction step limits the process feasibility. In the experiments, ammonium chloride (NH 4 Cl) water solution was used as an extracting solvent with varying concentrations of 0, 0.5, 1 and 2 mol/L using slag to solvent ratio of 100 g/L. The main objective of this study was to determine the optimal concentrations of solvent and particle size for leaching out calcium from the slag. Tests were performed at room temperature with varying particle size and solvent concentration. The extraction behaviors of different size fractions of the slag, 0-50 μm, 50-74 μm and 74-125 μm were studied. Dissolution results showed that with high solvent concentrations calcium extraction efficiency increases but at the same time, other elements are leached, such as vanadium, silicon and magnesium that act as impurities in the subsequent carbonation stage. It was found that with the largest particles, Ca extraction becomes limited by mass transfer and the availability of Ca from the particle. Our hypothesis is that the surface layer of the particles gets blocked by reaction products and stops the reaction. With the smallest particle size, before the surface gets blocked, more calcium could be extracted and the maximum extraction efficiency was not reached. © 2019 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117278
Appears in Collections: 气候变化与战略
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Recommended Citation:
Owais M.,Järvinen M.,Taskinen P.,et al. Experimental study on the extraction of calcium, magnesium, vanadium and silicon from steelmaking slags for improved mineral carbonation of CO 2[J]. Journal of CO2 Utilization,2019-01-01,31