A Review of the Application of Steel Slag in CO2 Fixation

Abstract Steel slag is the main by‐product during the steel manufacturing process, with the characteristics of large output and low utilization rate. Since the high content of calcium oxide in steel slag, it is often used for CO 2 capture. In this paper, progress on the development of steel slag for fixing CO 2 is reviewed. This review is organized according to the carbonation type of steel slag, including direct carbonation and indirect carbonation. For direct carbonation, it is introduced from two parts: aqueous carbonation and gas‐solid carbonation. For indirect carbonation, it is summarized according to the extracting agent. The carbonation condition and capacity will be carefully discussed. Besides, the techno‐economic assessments of using steel slag for CO 2 capture are discussed. This paper will provide an overview of the steel slag using for CO 2 sequestration available and valuable suggestions for future study.