	US 11,945,758 B2
	Compositions, methods, and systems related to multi-modal distribution of vaterite particles
Craig W Hargis, Campbell, CA (US); and Ryan J Gilliam, San Jose, CA (US)
Assigned to Arelac, Inc., San Jose, CA (US)
Filed by Arelac, Inc., San Jose, CA (US)
Filed on Apr. 28, 2023, as Appl. No. 18/141,129.
Application 18/141,129 is a continuation of application No. 18/086,081, filed on Dec. 21, 2022, granted, now 11,673,832.
Claims priority of provisional application 63/292,897, filed on Dec. 22, 2021.
Prior Publication US 2023/0339809 A1, Oct. 26, 2023
Int. Cl. C04B 7/345 (2006.01); C04B 28/04 (2006.01)

CPC C04B 7/3453 (2013.01) [C04B 28/04 (2013.01); C04B 2201/10 (2013.01); C04B 2201/20 (2013.01)]

20 Claims

1. A method of producing a cement composition, comprising:

(a) dissolving limestone in a N-containing salt solution to produce an aqueous solution comprising calcium salt and a gaseous stream comprising carbon dioxide; and (b) treating the aqueous solution comprising calcium salt with the gaseous stream comprising carbon dioxide to form a composition comprising bimodal distribution of reactive vaterite cement comprising reactive vaterite cement A having an average particle size of between about 0.1-10 μm and reactive vaterite cement B having an average particle size of between about 11-50 μm.