Method for preventing the formation of jarosite and ammonium...

C - Chemistry – Metallurgy – 22 – B

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C22B 3/42 (2006.01) C22B 3/26 (2006.01) C22B 3/38 (2006.01)

Patent

CA 2098638

The present invention relates to a method for preventing the formation of jarosite and ammonium- and alkali-based double salts in the solvent extraction of acidic extraction processes. The organic extraction solution is neutralized by ammonium or alkali salts prior to the separation of valuable metals in order to improve the extraction recovery. In a pre-extraction step after the neutralization, the extraction agent is contacted with an aqueous solution containing a metal which replaces the ammonium or alkali ions contained in the extraction solution. Thus the ammonium or alkali ions are removed from the extraction circuit prior to separation of the valuable metals by extraction.

La présente invention concerne une méthode pour empêcher la formation de jarosite et de sels doubles alcalins ou à base d'ammonium dans l'extraction par solvant de procédés d'extraction par acides. La solution d'extraction organique est neutralisée par les sels d'ammonium ou alcalins avant la séparation des métaux utiles afin d'améliorer la récupération par l'extraction. Dans une étape préalables à l'extraction après la neutralisation, l'agent d'extraction est mis en contact avec une solution aqueuse contenant un métal qui remplace les ions d'ammonium ou alcalins contenus dans la solution d'extraction. Ainsi, les ions d'ammonium ou alcalins sont enlevés du circuit d'extraction avant la séparation des métaux utiles par extraction.

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