Process to make calcium oxide or ordinary portland cement from calcium bearing rocks and minerals
OwnerCody E. FINKE, Hugo F. LEANDRIinventors
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Abstract
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.
Claims42
A method of producing a cement material, the method comprising steps 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 one or more calcium salts to produce a first cement material.
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A method for producing a cement material via reductive thermal decomposition, the method comprising steps of:
- reacting a calcium-bearing material with a chemically reducing gas to produce methane and a cement material.
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A method of producing a cement material, the method comprising steps of:
- 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 salt;
- first separating the first aqueous fraction from the first solid fraction;
- and
- treating the first calcium salt to produce a first cement material.
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Dependencies are inferred from the claim text.