Both the steel slag and cement offer a potential sink to store carbon in and both processes involve a form of ion extraction, usually calcium, to combine with the carbon dioxide to form the carbonate material. As was explained in the steel slag pilot plant facility, a solvent was necessary to promote this migration of calcium ions in the solid steel slag to a more reactive state that could combine with the carbon dioxide. However, other solvents are available to perform similar functions, just not in the context of steel slags. Other such solvents are sodium based and have been tested to see their practicality when used with a feedstock of the magnesium rich serpentinite.
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