US 12,077,447 B2
Methods and systems for treatment of lime to form vaterite
Michael Joseph Weiss, Los Gatos, 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 Dec. 6, 2022, as Appl. No. 18/075,831.
Application 18/075,831 is a continuation of application No. 17/184,933, filed on Feb. 25, 2021, granted, now 11,577,965.
Claims priority of provisional application 62/981,266, filed on Feb. 25, 2020.
Prior Publication US 2023/0118703 A1, Apr. 20, 2023
Int. Cl. C01F 11/18 (2006.01)
CPC C01F 11/183 (2013.01) [C01F 11/181 (2013.01); C01F 11/185 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method, comprising:
calcining limestone to form lime and a gaseous stream comprising carbon dioxide;
dissolving the lime in an aqueous solution comprising N-containing salt to produce an aqueous solution comprising calcium salt;
adding an aggregate comprising at least one of sand, gravel, crushed stone, slag, recycled concrete quartz, crushed round marble, glass spheres, granite, lime, calcite, feldspar, and alluvial sands, to the aqueous solution comprising calcium salt; and
treating the aqueous solution comprising calcium salt and the aggregate with the gaseous stream comprising carbon dioxide to form a precipitation material comprising calcium carbonate on a surface of the aggregate, wherein the calcium carbonate comprises vaterite.