US 11,718,558 B2
Process to make calcium oxide or ordinary Portland cement from calcium bearing rocks and minerals
Cody E. Finke, Pasadena, CA (US); and Hugo F. Leandri, Pasadena, CA (US)
Assigned to California Institute of Technology, Pasadena, CA (US); and Brimstone Energy Inc., Oakland, CA (US)
Filed by California Institute of Technology, Pasadena, CA (US); and Brimstone Energy Inc., Oakland, CA (US)
Filed on Aug. 24, 2022, as Appl. No. 17/894,621.
Application 17/894,621 is a continuation of application No. 16/992,318, filed on Aug. 13, 2020.
Claims priority of provisional application 63/019,916, filed on May 4, 2020.
Claims priority of provisional application 62/932,200, filed on Nov. 7, 2019.
Claims priority of provisional application 62/913,620, filed on Oct. 10, 2019.
Claims priority of provisional application 62/886,137, filed on Aug. 13, 2019.
Prior Publication US 2022/0411328 A1, Dec. 29, 2022
Int. Cl. C04B 2/10 (2006.01); C04B 11/00 (2006.01); C04B 22/06 (2006.01); C04B 40/00 (2006.01); C01F 7/56 (2022.01); C04B 11/30 (2006.01); C04B 28/04 (2006.01); C07C 1/32 (2006.01); C01G 49/14 (2006.01)
CPC C04B 2/10 (2013.01) [C01F 7/56 (2013.01); C04B 11/005 (2013.01); C04B 11/30 (2013.01); C04B 22/064 (2013.01); C04B 28/04 (2013.01); C04B 40/0046 (2013.01); C01G 49/14 (2013.01); C07C 1/328 (2013.01)] 28 Claims
OG exemplary drawing
 
1. A method comprising:
first reacting a calcium-bearing starting material with a first acid to produce a first aqueous fraction comprising an aqueous first calcium salt and a first solid fraction comprising one or more solid byproducts; wherein:
the calcium-bearing starting material has a chemical composition comprising a plurality of metal elements including at least Ca and Si;
the one or more solid byproducts comprises a silicon compound;
separating the first aqueous fraction from the first solid fraction; and
treating the first calcium salt to produce a first cement material.