LITHIUM RECOVERY FROM SLAGS

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...

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Main Authors LAINE, Petteri Heikki Samuli, CALLEBAUT, Willem, TANSKANEN, Pekka Antero, VERHEES, Pieter, LASSI, Ulla Marianne
Format Patent
LanguageEnglish
French
German
Published 22.05.2024
Subjects
BASIC ELECTRIC ELEMENTS
CHEMISTRY
ELECTRICITY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
PRETREATMENT OF RAW MATERIALS
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
PRODUCTION AND REFINING OF METALS
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary: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.
Bibliography:Application Number: EP20230163519