Hydrogen-free regeneration of dithiophosphorus metal...

C - Chemistry – Metallurgy – 07 – F

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C07F 9/40 (2006.01) C07F 9/02 (2006.01) C07F 9/165 (2006.01) C07F 9/32 (2006.01) C22B 3/00 (2006.01) C22B 3/26 (2006.01)

Patent

CA 2316878

This is a method of regenerating dithiophosphorus acids from disulfides containing sulfur-sulfur bonds, formed by oxidation of dithiophosphorus acids, such as sulfur-sulfur bonding of dithiophosphoric, dithiophosphonic and dithiophosphinic acids, in a solvent extraction organic phase in which the dithiophosphorus acid is dissolved in a diluent. This process reacts metal directly with the organic solution containing the disulfide to produce a metal loaded complex form of the regenerated dithiophosphorus extractant in the organic solution. This metal complex forms by direct reaction of the metal with the disulfides without requiring the presence or the formation of nascent or gaseous hydrogen. The organic solution containing the regenerated dithiophosphorus extractant can be either directly recycled into a solvent extraction circuit or recycled after the loaded metal is stripped.

Cette invention se rapporte à un procédé servant à régénérer des acides dithiophosphoreux à partir de disulfures contenant des liaisons soufre-soufre, formés par oxydation des acides dithiophosphoreux, par exemple par la liaison soufre-soufre d'acides dithiophosphoriques, dithiophosphoniques et dithiophosphiniques, dans une phase organique d'extraction par solvant dans laquelle l'acide dithiophosphoreux est dissous dans un diluant. Ce processus amène le métal à réagir directement avec la solution organique contenant le disulfure, afin de produire une forme de complexe chargée de métal de l'agent d'extraction dithiophosphoreux régénéré dans la solution organique. Ce complexe métallique se forme par réaction directe du métal avec les disulfures, sans que la présence ou la formation d'hydrogène naissant ou gazeux ne soient requises. La solution organique contenant l'agent d'extraction dithiophosphoreux régénéré peut être soit directement recyclée dans un circuit d'extraction par solvant soit recyclée après séparation du métal chargé.

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