碳中和背景下的钢渣碳酸化固碳路径研究

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

燃烧后捕集CO_(2)是重要的碳捕集途径之一,利用炼钢过程副产物钢渣中的碱性金属氧化物(CaO为主)与CO_(2)进行碳酸化反应从而实现固碳。综述了冷态钢渣直接固碳、冷态钢渣间接固碳、热态钢渣直接固碳3种主要方式及存在的问题,对比了3种固碳方式的优劣,指出热态钢渣直接固碳是“碳达峰,碳中和”背景下最符合我国国情的钢渣固碳技术,实现固碳的同时利用出炉钢渣余热,是最具应用前景的钢渣固碳技术之一。

CO_(2) 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 CO_(2).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.