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公开(公告)号：EP4372108A1
公开(公告)日：2024-05-22
申请号：EP23163519.4
申请日：2023-03-22
申请人： Umicore
发明人： TANSKANEN, Pekka Antero , LAINE, Petteri Heikki Samuli , LASSI, Ulla Marianne , CALLEBAUT, Willem , VERHEES, Pieter
摘要： Li-bearing slags are typically produced when Li-batteries or their waste are recycled on a smelter. The Li recovery process comprises the steps of:
- powdering the metallurgical slag to a particle size distribution having a D50 of less than 100 µm;
- contacting, in an aqueous medium, the Li-containing metallurgical slag, and an alkaline Ca-compound, provided in amounts selected to obtain a molar ratio of the Ca in the Ca-compound to Li in the slag of at least 0.75, thereby obtaining a suspension;
- heating the suspension to a temperature of more than 80 °C for at least 30 min, thereby obtaining a leached suspension; and,
- separating solids from liquids in the leached suspension, thereby obtaining a leach solution containing a major part of the Li, and a solid residue containing Ca.
This alkaline leaching process allows for a straightforward recovery of battery-grade LiOH from the leach solution, while consuming less reagents than known acidic leaching processes.
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