The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 2013
Filed:
May. 29, 2009
Sebastian Teir, Espoo, FI;
Sanni Eloneva, Espoo, FI;
Hannu Revitzer, Espoo, FI;
Ron Zevenhoven, Abo, FI;
Justin Salminen, Pori, FI;
Carl-johan Fogelholm, Tkk, FI;
Esko Poylio, Rovaniemi, FI;
Sebastian Teir, Espoo, FI;
Sanni Eloneva, Espoo, FI;
Hannu Revitzer, Espoo, FI;
Ron Zevenhoven, Abo, FI;
Justin Salminen, Pori, FI;
Carl-Johan Fogelholm, Tkk, FI;
Esko Poylio, Rovaniemi, FI;
Abstract
The present invention concerns a method for producing calcium carbonate containing the steps of extraction of alkaline industrial waste or by-products using as a first extraction solvent an aqueous solution of a salt formed from a weak acid and a weak base, whereby a vanadium-enriched first residue is allowed to settle and a calcium-rich first filtrate is formed, filtration, whereby the first filtrate is separated from the first residue, carbonation of the calcium-rich first filtrate using a carbonation gas, whereby calcium carbonate precipitates and a second filtrate is formed, and a second filtration, whereby the calcium carbonate is separated from the second filtrate. Further, the present invention concerns a method for extracting calcium carbonate and vanadium from alkaline industrial waste or by-products.