US 2022/0411328 A1

Process to make calcium oxide or ordinary Portland cement from calcium bearing rocks and minerals

(22) 24.08.2022

(43) 29.12.2022

(57) Aspects of the invention include a method of producing a cement material comprising step of: first reacting a calcium-bearing starting material with a first acid to produce an aqueous first calcium salt; second reacting the aqueous first calcium salt with a second acid to produce a solid second calcium salt; wherein the second acid is different from the first acid and the second calcium salt is different from the first calcium salt; and thermally treating the second calcium salt to produce a first cement material. Preferably, but not necessarily, during the second reacting step, reaction between the first calcium salt and the second acid regenerates the first acid.

(71) California Institute of Technology, Pasadena, CA (US); Brimstone Energy Inc., Oakland, CA (US)

Issue 1/2024 US 2023/0339807 A1

Process to make calcium oxide or ordinary portland cement from calcium bearing rocks and minerals

(22) 14.06.2023 (43) 26.10.2023 (57) Aspects of the invention include a method of producing a cement material comprising step of: first reacting a calcium-bearing starting material with a first acid...

Issue 4/2022 US 2022/0081311 A1

Sustainable calcium hydroxide production for green cement

(22) 24.08.2021 (43) 17.03.2022 (57) A method of making a composition of matter comprising calcium hydroxide. The method includes the steps of contacting a calcium-containing molecule with an aqueous...

Issue 3/2022 WO 2022/043349 A1

Limestone calcined clay cement (LC3) construction composition

(22) 25.08.2021 (43) 03.03.2022 (57) A limestone calcined clay cement construction composition comprises a) a cementitious binder comprising one or more calcium silicate mineral phases and one or more...

Issue 9/2016 WO 2016/115398 A1

Controlled process for precipitating calcium carbonate and vaterite precipitated calcium carbonate compositions formed by said process

(22) 14.01.2016 (43) 21.07.2016 (57) A process for converting gypsum into precipitated calcium carbonate including reacting a mixture comprising gypsum and a seed, a mineral acid, or both with at...

Issue 2/2022 WO 2022/006230 A1

Methods and systems for forming vaterite from calcined limestone using electric kiln

(22) 30.06.2021 (43) 06.01.2022 (57) Provided herein are zero carbon dioxide (CO2) emission processes and systems to carry out the processes, comprising a) calcining limestone in a cement plant in an...

ZKG 2/2023