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US 11,939,227 B2Granted
Methods and systems for utilizing calcium compound from calcined limestone
AssigneeArelac, Inc.
InventorsMichael Joseph Weiss, Ryan Gilliam
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Abstract
Provided herein are methods comprising a) calcining limestone in a cement plant to form carbon dioxide and calcium compound selected from calcium oxide, calcium hydroxide, or combination thereof; b) treating the calcium compound with N-containing salt in water to produce an aqueous solution comprising calcium salt and N-containing salt; and c) contacting the aqueous solution with the carbon dioxide under one or more precipitation conditions to produce a precipitation material comprising calcium carbonate and a supernatant aqueous solution wherein the calcium carbonate comprises vaterite.
Claims23
A method comprising:
- a) calcining limestone to form carbon dioxide and calcium compound comprising calcium oxide, wherein the limestone comprises magnesium carbonate, and wherein the calcium oxide comprises soft burnt lime;
- b) treating the calcium compound with N-containing salt in water to produce an aqueous solution comprising calcium salt and solid;
- and
- c) contacting the aqueous solution comprising calcium salt and solid with the carbon dioxide to produce a precipitation material comprising calcium carbonate and solid wherein the calcium carbonate comprises vaterite.
1 more element
Dependencies are inferred from the claim text.