Method and apparatus for back-extracting metal chelates

Details Method and apparatus for back-extracting metal chelates Method and apparatus for back-extracting metal chelates

C - Chemistry, Metallurgy

22

B

C22B 3/44 (2006.01) B01D 11/02 (2006.01) B01D 11/04 (2006.01) C22B 3/02 (2006.01) C22B 3/04 (2006.01) C22B 3/26 (2006.01) C22B 59/00 (2006.01) C22B 60/02 (2006.01)

Patent

CA 2260831

A method of extracting metal and metalloid species from a solid or liquid substrate using a supercritical fluid solvent containing one or more chelating agents followed by back-extracting the metal and metalloid species from the metal and metalloid chelates formed thereby. The back-extraction acidic solution is performed utilizing an acidic solution. Upon sufficient exposure of the metal and metalloid chelates to the acidic solution, the metal and metalloid species are released from the chelates into the acid solution, while the chelating agent remains in the supercritical fluid solvent. The chelating agent is thereby regenerated and the metal and metalloid species recovered.

L'invention concerne un procédé pour extraire des espèces métalliques et métalloïdes d'un substrat liquide ou solide au moyen d'un solvant fluide supercritique contenant un ou plusieurs agents chélateurs, suivi de l'extraction inverse des espèces métalliques et métalloïdes des chélates métalliques et métalloïdes ainsi formés. La solution acide d'extraction inversée s'effectue au moyen d'une solution acide, les espèces métalliques et métalloïdes sont libérées des chélates dans la solution aide alors que l'agent chélateur reste dans le solvant fluide supercritique. L'agent chélateur est ainsi régénéré et les espèces métalliques et métalloïdes récupérées.

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