Research on carbon sequestration path of steel slag carbonation under carbon neutralization background

doi:10.3969/j.issn.1674-1951.2021.06.011

Abstract

Abstract:

CO₂ capture after combustion is one of the important ways of carbon capture.Carbon sequestration can be achieved by carbonation reaction between alkali metal oxides （CaO-based） in steel slag and CO₂.This paper reviews three main methods for carbon sequestration,direct carbon fixation with cold steel slag,indirect carbon fixation with cold steel slag and direct carbon fixation with hot steel slag.After summarizing the methods and pointing out the existing problems,the advantages and disadvantages of the three methods were compared.It is pointed out that the direct carbon fixation with hot steel slag is the most suitable carbon fixation technology with steel slag under the background of carbon peak and carbon neutralization.By realizing carbon sequestration and steel slag waste heat recycling simultaneously,it is one of the most promising carbon fixation technologies.

Key words: carbon fixation by steel slag, carbon capture, cold steel slag direct carbon fixation, cold steel slag indirect carbon fixation, hot steel slag direct carbon fixation, carbon neutralization, carbon peak, carbon sink

CLC Number:

TK09：TK11 ⁺5

ZHANG Shufan, CHENG Xingxing, WANG Luyuan, ZHANG Xingyu, WANG Zhiqiang. Research on carbon sequestration path of steel slag carbonation under carbon neutralization background[J]. Huadian Technology, 2021, 43(6): 86-91.

Figures/Tables 2

References 42

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成分	质量分数/%
CaO	45.0~65.0
SiO₂	15.0~25.0
Al₂O₃	1.0~5.0
FeO	5.0~12.0
Fe₂O₃	5.0~12.0
MgO	7.0~16.0
MnO	1.0~7.0
P₂O₅	1.0~5.0
f‑CaO	0~10.0

固碳方式	反应工艺	反应时间/h	CO₂体积分数/%	温度/ ℃	碳酸化转化率/%
冷态钢渣直接固碳	高压反应釜^[17]	12	99.0	40~60	68.0
冷态钢渣直接固碳	PRB^[18]	1	99.0	25	93.5
冷态钢渣间接固碳	乙酸、搅拌^[42]	1	99.0	80	20.0
	盐酸、搅拌^[26]	1	99.0	25	56.8
	乙酸、搅拌、掺杂TBP^[42]	1	99.0	80	40.0
	NH₄Cl溶液、搅拌^[30]	2	99.0	80	60.0
热态钢渣直接固碳	固定床反应^[27]	1	99.0	600	20.4
热态钢渣直接固碳	固定床反应^[27]	1	15.0	600	18.8