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US 11,667,567 B2Granted
Compositions, methods, and systems to form vaterite with magnesium oxide
AssigneeArelac, Inc.
InventorsCraig Hargis, Ryan J Gilliam
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Abstract
Provided herein are compositions, methods, and systems comprising vaterite and magnesium oxide.
Claims21
A cement or non-cement composition comprising vaterite and magnesium oxide, wherein the vaterite is between about 30-90 wt % and magnesium oxide is between about 1-70 wt % and/or particle size of the vaterite is between about 0.1-100 micron.
A method to form a composition, comprising:
- (i) calcining limestone to form a mixture comprising lime and magnesium oxide, and a gaseous stream comprising carbon dioxide;
- (ii) dissolving the mixture comprising lime and magnesium oxide in a N-containing salt solution to produce an aqueous solution comprising calcium salt and a solid comprising magnesium oxide;
- (iii) treating the aqueous solution comprising calcium salt and the solid comprising magnesium oxide with the gaseous stream comprising carbon dioxide to form a composition comprising vaterite and the solid comprising magnesium oxide, and
- (iv) transforming the vaterite to aragonite and/or calcite upon dissolution and re-precipitation in water and transforming the magnesium oxide to magnesium hydroxide.
1 more element
Dependencies are inferred from the claim text.