Method for recycling metals from porous materials comprising them

Abstract

An object of the present invention is a method for recycling a metal or several metals M selected from among those belonging to the columns 8 to 12 of the periodic table of elements, present at least partially in the form of metal sulphides in a porous material A comprising at least one mineral oxide and having a sulphur content higher than or equal to 2% by weight. Said method comprises the following successive steps: (1) at least one step of heat treatment of the material A in the presence of oxygen, at a temperature comprised within the range from 350° C. to 900° C.; (2) at least one step of washing the material A′ derived from step (1) by means of an aqueous solvent; (3) at least one step of extracting the metal(s) M by setting the material A″ derived from step (2) in contact with a solution S containing at least one carboxylic acid; and (4) at least one step of depositing at least one portion of the metal(s) M over a porous material B different from said material A, by setting the solution S′ derived from step (3) in contact with said material B.

Dependencies are inferred from the claim text.