While slag can be made to absorb significant amounts of CO₂ in lab experiment, the process typically involves high temperature and pressure. However, according to the study, slag, if its formed and piled in a certain way, could be an effective carbon absorbent and passively offset carbon dioxide emissions from the steelmaking process by 10%.

“With carbon credits being used more and more, globally, and with pressure from consumer groups to minimize the carbon footprint of industries, this is a way in which the steelmaking industry can take a positive step forward to cut their emissions,” Andy Bray, an environmental mineralogist at the University of Leeds and a co-author of the study, told Chemical & Engineering News.

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