Method for dissolving precious metals

Shuang Ma Andersen (Opfinder), Raghunandan Sharma (Opfinder)

Publikation: Patent


The present invention relates to a method for dissolving, recovering, extracting or separating precious metals. Efficient recovery of precious metals from industrial spent catalysts through electrochemical means using dilute acid/acid-free electrolytes is of significant importance from both the industrial and the environmental points of view. Owing to their large surface-to-volume ratio, fast dissolution through electrochemical potential cycling is possible. However, redeposition of the dissolved metal species on larger particles reduces the process efficiency significantly. In one aspect of the present invention, faster dissolution can be attained by inhibition of particle growth using surface switching species (SSS) functioning to selectively block and expose the metal surface to facilitate dissolution and inhibit redeposition, respectively. In another aspect of the present invention, the redeposition may be minimized by removing the dissolved Pt species redepositiong them (in metal form) electrochemically on a second working electrode.
PatentnummerWO2019211318 (A1)
PrioritetsnummerEP20180170312 20180502
StatusUdgivet - 7. nov. 2019


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