A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
INTEGRIERTES VERFAHREN ZUR KOMMERZIELLEN UND INDUSTRIELLEN VERWERTUNG VON KALZIUMSULFAT UNTER GEWINNUNG VON SELTENEN ERDEN AUS DER PHOSPHORSÄUREPRODUKTION
A process may involve treating calcium sulfate separated from phosphoric acid with acid to obtain a suspension comprising purified calcium sulfate, separating the purified calcium sulfate in solid form from a liquid phase of the suspension, treating the purified calcium sulfate with water or with a salt- and/or chelate ligand-containing aqueous solution to leach rare earths out of the calcium sulfate, separating the further-purified calcium sulfate in solid form from the liquid phase of the suspension, mixing the purified calcium sulfate that is separated off with admixtures and reducing agents to obtain a raw meal mixture for cement clinker production, burning the raw meal mixture to obtain the cement clinker and thereby forming sulfur dioxide as offgas, and feeding the sulfur dioxide as raw material to sulfuric acid production to produce the sulfuric acid.
INTEGRIERTES VERFAHREN ZUR KOMMERZIELLEN UND INDUSTRIELLEN VERWERTUNG VON KALZIUMSULFAT UNTER GEWINNUNG VON SELTENEN ERDEN AUS DER PHOSPHORSÄUREPRODUKTION
A process may involve treating calcium sulfate separated from phosphoric acid with acid to obtain a suspension comprising purified calcium sulfate, separating the purified calcium sulfate in solid form from a liquid phase of the suspension, treating the purified calcium sulfate with water or with a salt- and/or chelate ligand-containing aqueous solution to leach rare earths out of the calcium sulfate, separating the further-purified calcium sulfate in solid form from the liquid phase of the suspension, mixing the purified calcium sulfate that is separated off with admixtures and reducing agents to obtain a raw meal mixture for cement clinker production, burning the raw meal mixture to obtain the cement clinker and thereby forming sulfur dioxide as offgas, and feeding the sulfur dioxide as raw material to sulfuric acid production to produce the sulfuric acid.
INTEGRIERTES VERFAHREN ZUR KOMMERZIELLEN UND INDUSTRIELLEN VERWERTUNG VON KALZIUMSULFAT UNTER GEWINNUNG VON SELTENEN ERDEN AUS DER PHOSPHORSÄUREPRODUKTION
INTEGRATED METHOD FOR THE COMMERCIAL AND INDUSTRIAL UTILISATION OF CALCIUM SULPHATE WHILST OBTAINING RARE EARTH ELEMENTS FROM THE PRODUCTION OF PHOSPHORIC ACID
PROCÉDÉ INTÉGRÉ DE VALORISATION COMMERCIALE ET INDUSTRIELLE DE SULFATE DE CALCIUM AVEC OBTENTION DE TERRES RARES ISSUES DE LA PRODUCTION D'ACIDE PHOSPHORIQUE
HELMLE STEFAN (author) / STOCKHOFF PETER (author) / DAHEIM NICOLAI (author)
2024-04-03
Patent
Electronic Resource
German
IPC:
C01B
NON-METALLIC ELEMENTS
,
Nichtmetallische Elemente
/
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
/
C04B
Kalk
,
LIME
/
C22B
PRODUCTION OR REFINING OF METALS
,
Gewinnen oder Feinen von Metallen
| European Patent Office | 2021
| European Patent Office | 2021
| European Patent Office | 2021
| European Patent Office | 2021
| European Patent Office | 2021