Carbon dioxide sequestration on steel slag

Carbonation of Ca/Mg-containing industrial alkaline residues is a novel way for CO₂ sequestration, which attracts increasing attention in the context of cutting down CO₂ emissions. Steel slag, a typical industrial byproduct produced during the steel making process, usually contains abundant CaO and exhibits high carbonation reactivity and hence great capacity of CO₂ adsorption. Utilization of the steel slag is of increasing interest owing to the issues of environmental protection, as well as sustainable development in the steel industry. Therefore, CO₂ sequestration with steel slag through accelerated carbonation is of great significance. In this chapter, the formation process, physico-chemical properties, carbonation mechanism, carbonation rate, heavy metal leaching of steel slag, and in particular, the microstructure, performance, and application of carbonated steel slag as construction materials are discussed.