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US 12,668,498 B2Granted
Recovery of lithium carbonate from basic aqueous lithium containing solutions
AssigneeAmerican Hyperform, Inc.
InventorWilliam Novis Smith
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Abstract
A more efficient and lower waste liquid-phase method for recovering lithium carbonate suitable for high-performance lithium applications from recycled lithium-ion battery and other sources of lithium hydroxide including aqueous solutions is described. The method uses carbon dioxide gas to directly form lithium carbonate from a lithium hydroxide including solution, thus eliminating the need for conventional acid pre-treatment and reducing the need for subsequent sodium carbonate addition.
Claims33
A liquid-phase method to recover lithium carbonate from a basic aqueous lithium hydroxide solution, the method comprising:
- agitating a basic aqueous lithium hydroxide solution;
- adding carbon dioxide to the basic aqueous lithium hydroxide solution;
- terminating the adding carbon dioxide when a pH of the basic aqueous lithium hydroxide solution decreases to a pH from 8 to 10.5;
- forming a precipitated lithium carbonate slurry in response to the adding the carbon dioxide to the basic aqueous lithium hydroxide solution;
- adding an aqueous base to the precipitated lithium carbonate slurry;
- hot filtering the precipitated lithium carbonate slurry;
- and
- recovering the precipitated lithium carbonate as a solid.
5 more elements
Dependencies are inferred from the claim text.