LITHIUM OR MAGNESIUM EXTRACTION PROCESSES
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United States of America Patent
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Issued Date -
Jun 22, 2023
app pub date -
May 14, 2021
filing date -
May 15, 2020
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Abstract
Systems and methods for removing lithium and/or magnesium from an aqueous solution are disclosed. The aqueous solution is extracted using an organic phase composition that comprises a hydroxamic acid, desirably an N-alkyl alkanohydroxamic acid having at least 9 carbon atoms. The extraction is performed at least twice, each time at a different pH. The first extraction is performed at an acidic pH and removes metal ions that otherwise interfere with lithium extraction. The second extraction is performed at a higher pH than the first extraction, and results in captured lithium and/or magnesium, and an aqueous salt solution.
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