Solvent extraction process for the recovery of valuable...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 3/26 (2006.01) B01D 11/04 (2006.01) C22B 3/18 (2006.01) C22B 3/30 (2006.01) C22B 15/00 (2006.01)

Patent

CA 2391394

Multistage process for the recovery of valuable metals from an acidic, aqueous leachate solution in which valuable metal ions are present in concentrations of from 10 to 40 g/l, which comprises (I) liquid/liquid extraction of the leachate solution, where the leachate solution is brought into contact at least once with an organic, water-insoluble extractant, (II) and subsequently bringing the extractant loaded with valuable metal ions obtained from (I) into contact at least once with an acidic aqueous phase, with the major part of the valuable metal ions being transferred into the acidic aqueous phase, (III) and subjecting the acidic aqueous phase obtained from (II) to an electrolysis or crystallization process for recovering the valuable metal, wherein the pH of the aqueous leachate solution is set to at least 1.2 and not more than 2.5 before and/or during the liquid/liquid extraction process (I).

L'invention concerne un procédé exécuté en plusieurs étapes, permettant de récupérer des métaux de valeur à partir d'une solution aqueuse acide de lixaviat dans laquelle des ions de métaux de valeur sont présents selon des concentrations de 10 à 40 g/l. Ce procédé consiste I) à effectuer une extraction liquide/liquide à partir de la solution de lixaviat, ladite solution étant amenée au moins une fois en contact avec un agent d'extraction organique insoluble dans l'eau; II) puis à amener l'agent d'extraction chargé d'ions de métaux de valeur obtenus pendant l'étape (I) au moins une fois en contact avec une phase aqueuse acide, la majeure partie des ions de métaux de valeur étant transférée dans ladite phase aqueuse acide; III) et à soumettre la phase aqueuse acide obtenue à partir de l'étape (II) à un processus d'électrolyse ou de cristallisation afin de récupérer les métaux de valeur, le pH de la solution aqueuse de lixaviat étant au moins égal à 1,2 et inférieur ou égal à 2,5 avant et/ou pendant le processus d'extraction liquide/liquide (I).

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