A method for extracting copper from an aqueous solution

C - Chemistry – Metallurgy – 22 – B

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C22B 3/26 (2006.01) B01D 11/04 (2006.01) C22B 15/00 (2006.01)

Patent

CA 2370923

The invention relates to a method for extracting copper in liquid-liquid solvent extraction from aqueous solution with a high sulphate content, by raising the viscosity of the extraction solution and by dispersing the aqueous solution into drops, achieving a dense drop aggregation. The viscosity of the extraction solution may be raised either by increasing the content of the actual extractant, the extraction reagent, in the extraction solution or by using a diluting agent with a higher viscosity than that of the diluting agent normally used. By raising the viscosity of the extraction solution the mixing durability of the extraction dispersion can be increased and resulting of that the amount of residual drops is decreased. Other advantages are that the extraction solution flow of the extraction process decreases in relation to the flow of the aqueous solution acting as the copper source and that the size of the extraction equipment needed is reduced.

L'invention concerne un procédé d'extraction de cuivre dans une extraction liquide-liquide par solvant, à partir d'une solution aqueuse comprenant une teneur élevée en sulfate, ce procédé consistant à élever la viscosité de la solution d'extraction et à disperser la solution aqueuse en gouttelettes, de manière à obtenir une agglomération dense des gouttelettes. On peut élever la viscosité de la solution d'extraction soit en augmentant, dans la solution d'extraction, la teneur de l'agent extractant utilisé, du réactif d'extraction, soit en utilisant un agent de dilution possédant une viscosité supérieure à celle de l'agent de dilution généralement utilisé. En élevant la viscosité de la solution d'extraction, on peut augmenter la durabilité du mélange de la dispersion d'extraction, ce qui contribue à faire diminuer la quantité de gouttelettes résiduelles. D'autres avantages résident en ce que l'écoulement de la solution d'extraction du procédé d'extraction décroît par rapport à l'écoulement de la solution aqueuse agissant en tant que source de cuivre, et en ce que la dimension du matériel d'extraction requis est réduite.

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