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1. WO2020109045 - RECYCLAGE DE BATTERIE PAR INJECTION D'HYDROGÈNE GAZEUX DANS UN LIXIVIAT

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

1. A process for the recovery of transition metals from batteries comprising

(a) treating a transition metal material with a leaching agent to yield a leach which contains dissolved salts of nickel and/or cobalt,

(b) injecting hydrogen gas in the leach at a temperature above 100 °C and a partial

pressure above 5 bar to precipitate nickel and/or cobalt in elemental form, and

(c) separation of the precipitate obtained in step (b).

2. The process according to claim 1 where the hydrogen gas is injected in the leach at the temperature of 150 to 280 °C.

3. The process according to claim 1 or 2 where the hydrogen gas is injected in the leach at a partial pressure from the range 5 to 100 bar; for example 5 to 60 bar or 45 to 100 bar.

4. The process according to any of claims 1 to 3 where the hydrogen gas is injected in the leach at a pH-value above 4.

5. The process according to any of claims 1 to 4 claims where the leaching agent comprises an inorganic acid, an organic acid, a base or a chelating agent.

6. The process according to any of claims 1 to 5 where the transition metal material contains 1 to 30 wt% nickel as metal or in form of one or more of its compounds.

7. The process according to any of the claims 1 to 6 where in step (a) the leach contains

dissolved salts of nickel, and where in step (b) elemental nickel is precipitated, optionally in the presence of a nickel-reduction catalyst.

8. The process according to any of the claims 1 to 7 comprising

(a) treating the transition metal material with the leaching agent to yield the leach which contains dissolved salts of nickel and cobalt,

(b1 ) injecting hydrogen gas in the leach at a temperature above 100 °C and a partial pressure above 5 bar, and optionally in the presence of a nickel-reduction catalyst, to precipitate nickel in elemental form,

(c1 ) separation of the precipitate obtained in step (b1 ) to yield a cobalt solution comprising the dissolved salts of cobalt,

(b2) injecting hydrogen gas in the cobalt solution at a temperature above 100 °C and a partial pressure above 5 bar, and optionally in the presence of a cobalt-reduction catalyst, to precipitate cobalt in elemental form, and

(c2) separation of the precipitate obtained in step (b2).

9. The process according to any of the claims 1 to 8 where in step (c) the separation of the precipitate is done by magnetic separation.

10. The process according to any of claims 1 to 9 where the transition metal material contains at least one battery component selected from lithium and its compounds, carbon in electrically conductive form, solvents used in electrolytes, aluminum and compounds of aluminum, iron and iron compounds, zinc and zinc compounds, silicon and silicon compounds, tin, silicon-tin alloys, organic polymers, fluoride, and compounds of

phosphorous.

1 1. The process according to any of claims 1 to 10 where the leach contains at least one

further dissolved component selected from inorganic salts of iron, manganese, lithium, zinc, tin, zirconium, aluminum, tungsten or copper, and where the further dissolved components remain in dissolved form during step (b).

12. The process according to any of claims 1 to 11 further comprising the step

(a1) removing of non-dissolved solids from the leach.

13. The process according to any of claims 1 to 12 further comprising the step

(a2) adjusting the pH value of the leach to 2.5 to 8, and

(a3) removing of precipitates of phosphates, oxides, hydroxides or oxyhydroxides by solid- liquid separation.

14. The process according to any of claims 1 to 13 where the transition metal material is

obtained from mechanically treated battery scraps, or it is obtained as metal alloy from smelting battery scrap.

15. The process according to any of claims 1 to 14 further comprising the step

(a5) removing of precious metals and/or copper from the leach by cementation.

16. The process according to any of claims 1 to 15 further comprising the step

(a6) removing of precious metals and/or copper from the leach by depositing the dissolved precious metals and/or copper impurities as elemental precious metal and/or copper on a particulate deposition cathode by electrolysis of an electrolyte containing the leach.