Process for recovery of noble metals from functionalised, noble metal-containing adsorption materials
AssigneeHeraeus Precious Metals GmbH & Co. KG
InventorsJoachim Kralik, Martin Stettner, Stefanie Fuchs Alameda
Life of this patent
Estimating the term…
Abstract
A method recovers noble metals from noble metal-containing compositions and includes steps of (i) providing a noble metal-containing composition containing an adsorption agent that is based on an inorganic material and is functionalized by organic groups and has at least one noble metal adsorbed to it, and (ii) ashing of the noble metal-containing composition provided in step (i) in order to adjust a residual carbon content of at most 10% by weight, relative to the total weight of the noble metal-containing composition after ashing, to obtain an ashed composition.
Claims14
A method for recovery of noble metals from noble metal-containing compositions, the method comprising the steps of:
- i) providing a noble metal-containing composition containing an adsorption agent, comprising an inorganic material and functionalized by organic groups;
- and having at least one noble metal adsorbed to the absorption agent;
- ii) ashing of the noble metal-containing composition to adjust a residual carbon content to at most 10% by weight, relative to the total weight of the noble metal-containing composition after ashing, to obtain an ashed composition;
- iii) at least partial dissolution of the ashed composition in an alkaline aqueous solution to obtain a noble metal-containing residue;
- iv) at least partial dissolution of the noble metal-containing residue in an oxidizing aqueous acid to obtain an aqueous salt solution of the noble metal;
- and
- v) optionally, recovering the noble metal through reduction of the noble metal salt solution.
Dependencies are inferred from the claim text.