PROCESS FOR THE RECOVERY OF LITHIUM

The present invention relates to an enhanced process for the recovery of lithium from compositions also containing aluminum. An example of such a metallurgical compositions is the metallurgical slag that is obtained when recycling lithium-ion batteries or their derived products using a pyrometallurg...

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Bibliographic Details
Main Authors DUPONT, David, OOSTERHOF, Harald, DROUARD, Wendy
Format Patent
LanguageEnglish
French
German
Published 12.05.2021
Subjects
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
PRETREATMENT OF RAW MATERIALS
PRODUCTION AND REFINING OF METALS
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary:The present invention relates to an enhanced process for the recovery of lithium from compositions also containing aluminum. An example of such a metallurgical compositions is the metallurgical slag that is obtained when recycling lithium-ion batteries or their derived products using a pyrometallurgical smelting process. Acid leaching of such a slag, followed by neutralization to precipitate aluminum leads to poor lithium yields as lithium tends to co-precipitate with aluminum. A process is presented wherein aluminum is selectively precipitated using a source of phosphate at a controlled pH preferably between 3 and 4.
Bibliography:Application Number: EP20180722894