Process for removing impurities in the recycling of lithium-ion batteries
AssigneeGreen Li-Ion Pte. Ltd.
InventorReza Katal
Life of this patent
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Abstract
A method of treating a leaching solution derived from a black mass from spent lithium-ion batteries comprising setting pH of the leaching solution to about pH 1.2 to 2.5, adding iron powder to induce copper cementation, adding lime after copper cementation, and after adding lime, transiting pH of the leaching solution to about pH 6 to extract calcium fluoride, titanium hydroxide, aluminium hydroxide, iron hydroxide, and iron phosphate. A black mass recycling system comprising an impurity removal reactor configured to receive a sodium hydroxide feed, an iron powder feed, and a lime feed.
Claims12
A method of treating a leaching solution comprising:
- setting pH of the leaching solution to about pH 1.2 to 2.15, wherein the leaching solution is derived from a black mass comprising iron, copper, fluorine, phosphorous, titanium, and aluminium;
- adding iron powder to induce copper cementation;
- after copper cementation, adding lime;
- and
- after adding lime, transiting pH of the leaching solution to about pH 6 to extract calcium fluoride, titanium hydroxide, aluminium hydroxide, iron hydroxide, and iron phosphate.
A black mass recycling system comprising:
- an impurity removal reactor configured to receive a sodium hydroxide feed, an iron powder feed, and a lime feed;
- a leaching reactor configured to receive a sulfuric acid feed, a hydrogen peroxide feed, a deionised water feed, and a black mass feed comprising iron, copper, fluorine, phosphorous, titanium, and aluminium;
- and
- a first valved outlet associated with the leaching reactor providing fluid communication between the leaching reactor and the impurity removal reactor.
Dependencies are inferred from the claim text.