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(a) Comparison between the experimental and modeled portlandite purity at ∼100% Ca conversion for different Ca/CO2 separation values. (b) Contaminants (Al, Fe, Si, and Mg) removed from the Ca-enriched feed by precipitation of hydroxides and hydrated solids. SiO2 is amorphous silica, and C-M-S-H is a calcium and magnesium containing silicate hydrate phase.
