Recovery method for a continuous calcium extraction and PCC production
AssigneeCorex Materials Corporation
InventorFrank A. Karbarz
Life of this patent
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Abstract
A method of mineralizing calcium from industrial waste comprising extracting calcium ions from a suspension of calcium rich granular particles and aqueous ammonium nitrate to form a calcium-rich first fraction and a heavy second fraction. The heavy second fraction is separated from the first fraction and the calcium-rich first fraction is carbonated with a gas comprising carbon dioxide to form a suspension of precipitated calcium carbonate and aqueous ammonium nitrate. The precipitate is separated from the aqueous ammonium nitrate by centrifugal means and the separated heavy second fraction comprises an enriched weight percent of iron.
Claims15
A method of mineralizing calcium from industrial waste comprising:
- a. extracting calcium ions from a suspension of calcium rich particles and aqueous ammonium nitrate, forming a calcium-rich first fraction and a heavy second fraction;
- wherein said heavy second fraction is separated from said first fraction by centrifugal means;
- b. carbonating the calcium-rich first fraction with a gas comprising carbon dioxide, forming a suspension of precipitated calcium carbonate, and aqueous ammonium nitrate, wherein said precipitate is separated from said aqueous ammonium nitrate by centrifugal means;
- and
- wherein said heavy second fraction comprises an enriched weight percent of iron.
A method of enriching the iron content of calcium rich industrial waste the method comprising:
- extracting calcium ions from a suspension of starting material of calcium rich industrial waste and aqueous ammonium nitrate, forming a calcium-rich first fraction and a heavy second fraction;
- wherein said heavy second fraction is separated from said first fraction by centrifugal means;
- wherein said heavy second fraction comprises an enriched weight percent of iron.
Dependencies are inferred from the claim text.