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US 12,522,511 B2Granted
Methods and systems for treatment of limestone to form vaterite
AssigneeArelac, Inc.
InventorsMichael Joseph Weiss, Ryan J Gilliam
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Abstract
Provided herein are methods and systems to form calcium carbonate comprising vaterite, comprising dissolving limestone in an aqueous base solution under one or more precipitation conditions to produce a precipitation material comprising calcium carbonate and a supernatant solution, wherein the calcium carbonate comprises vaterite.
Claims20
A method comprising:
- (i) dissolving limestone in N-containing salt solution to produce an aqueous solution comprising calcium salt and gaseous stream comprising carbon dioxide, wherein the N-containing salt is N-containing organic salt that has N-containing organic compound selected from the group consisting of aliphatic amine, alicyclic amine, heterocyclic amine, and combination thereof;
- and
- (ii) treating the aqueous solution comprising calcium salt with the gaseous stream comprising carbon dioxide to form precipitation material comprising calcium carbonate, wherein the calcium carbonate comprises vaterite, aragonite, calcite, precipitated calcium carbonate (PCC), or combination thereof.
Dependencies are inferred from the claim text.