摘要 |
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. |
申请人 |
HELSINKI UNIVERSITY OF TECHNOLOGY;AABO AKADEMI;RAUTARUUKKI OYJ;TEIR, SEBASTIAN;ELONEVA, SANNI;REVITZER, HANNU;ZEVENHOVEN, RON;SALMINEN, JUSTIN;FOGELHOLM, CARL-JOHAN;POEYLIOE, ESKO |
发明人 |
TEIR, SEBASTIAN;ELONEVA, SANNI;REVITZER, HANNU;ZEVENHOVEN, RON;SALMINEN, JUSTIN;FOGELHOLM, CARL-JOHAN;POEYLIOE, ESKO |