Process for the recovery of lithium and transition metal using heat
Process for the recovery of transition metal from spent lithium ion batteries containing nickel, wherein said process comprises the steps of (a) heating a lithium containing transition metal oxide material to a temperature in the range of from 400 to 1200° C., (b) treating said heat-treated material with water, (c) treating the solid residue from step (b) with an acid selected from sulfuric acid, hydrochloric acid, nitric acid, methanesulfonic acid, oxalic acid and citric acid, (d) adjusting the pH value to 2.5 to 8, (e) removing compounds of Al, Cu, Fe, Zn or combinations of at least two of the foregoing from the solution or slurry obtained in step (d).
1. A process for the recovery of transition metal from spent lithium ion batteries containing nickel, wherein said process comprises the steps of
(a) heating a lithium containing transition metal oxide material to a temperature in the range of from 600 to 1200° C.,
(b) treating said heat-treated material with water and obtaining a solid residue,
(c) treating the solid residue obtained in step (b) with an acid selected from the group consisting of sulfuric acid, hydrochloric acid, nitric acid, methanesulfonic acid, oxalic acid and citric acid to obtain a solution or slurry,
(d) adjusting the pH value of the solution or slurry comprising the solid residue treated in step (c) to 2.5 to 8,
(e) removing compounds of Al, Cu, Fe, Zn or combinations of at least two of the foregoing from the solution or slurry obtained in step (d);
(f) precipitating nickel and, if applicable, cobalt and/or manganese as (mixed) hydroxide, oxyhydroxide or carbonate by raising the pH value above 8.
2. The process according to claim 1 wherein step (e) comprises the removal of precipitates of carbonates, oxides, phosphates, hydroxides or oxyhydroxides of Al, Cu, Fe, Zn, or combinations of at least two of the foregoing.
3. The process according to claim 1 wherein the lithium containing transition metal oxide material is present in form of complete batteries, battery modules, battery cells, or battery scraps.
4. The process according to claim 1 wherein step (b) is performed under CO 2 at a pressure in the range of from 10 to 150 bar.
5. The process according to claim 1 wherein step (b) is performed at a temperature in the range of from 5 to 100° C.
6. The process according to claim 1 wherein step (b) has a duration in the range of from 20 minutes to 10 hours.
7. The process according to claim 1 wherein step (a) is performed under inert atmosphere, under an atmosphere that contains oxygen, or the atmosphere is changed during step (a) from inert to oxygen containing atmosphere.
8. The process according to claim 1 wherein prior to step (c) a solid-solid separation step is performed to separate non-soluble components like carbon and polymers from the metallic or metal oxide components.
9. The process according to claim 8 wherein said solid-solid separation step is a magnetic separation step.
10. The process according to claim 1 wherein step (d) is performed by the addition of at least one of lithium hydroxide, sodium hydroxide, ammonia and potassium hydroxide.
11. The process according to claim 1 including recovering the lithium by way of precipitation as carbonate.