Experimental Study of CO₂ Sequestration by Steelmaking Slag

Steelmaking processes intensively use carbon-containing materials and generate a significant amount of carbon dioxide emissions. The U.S. steel industry produces ~1.75 tons CO2 for every ton of steel shipped. At the same time, steelmaking processes use calcium and magnesium oxide containing minerals for slag formation, which are excellent CO2 capture agents. The goal of this investigation was to experimentally study carbon dioxide sequestration by steelmaking slag with simultaneous acceleration of the slag stabilization processes in preparation for re-use as a construction material. Thermogravimetric methods and a slurry reactor were used to study reaction kinetics. The degree of slag carbonization was evaluated for industrial and synthetic slags in dry and wet and processes