US 11,939,227 B2
Methods and systems for utilizing calcium compound from calcined limestone
Michael Joseph Weiss, Los Gatos, CA (US); and Ryan Gilliam, San Jose, CA (US)
Assigned to Arelac, Inc., San Jose, CA (US)
Filed by Arelac, Inc., San Jose, CA (US)
Filed on Jul. 20, 2020, as Appl. No. 16/933,490.
Claims priority of provisional application 62/876,711, filed on Jul. 21, 2019.
Prior Publication US 2021/0017035 A1, Jan. 21, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C01F 11/18 (2006.01); C01C 1/08 (2006.01); C01C 1/16 (2006.01); C01C 1/22 (2006.01); C01C 1/24 (2006.01); C01F 11/06 (2006.01); C01F 11/24 (2006.01); C04B 2/10 (2006.01); C04B 14/28 (2006.01); C04B 28/10 (2006.01)
CPC C01F 11/183 (2013.01) [C04B 2/10 (2013.01)] 23 Claims
OG exemplary drawing
 
1. 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.