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Method and apparatus for the extraction of lithium from aqueous lithium sources containing dissolved lithium, carbonate, calcium and/or magnesium with aid of nanofiltration and reverse osmosis membranes

 
: Alyousef, Yousef M.; Hippauf, Felix; Abendroth, Thomas; Al Jilil, Saad; Althues, Holger; Kaskel, Stefan; Alrasheed, Radwan

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WO 2021160241 A1: 20200210
Englisch
Patent, Elektronische Publikation
Fraunhofer IWS ()

Abstract
The invention relates to a method and an apparatus for extracting lithium from an aqueous lithium source (5) comprising the steps of removing by nanofiltration (S1) dissolved calcium ions Ca2+ and/or dissolved magnesium ions Mg2+ from an aqueous lithium source (5) containing dissolved lithium ions Li+, dissolved carbonate ions C03 2-, dissolved calcium ions Ca2+ and/or dissolved magnesium ions Mg2+, removing by reverse osmosis (S2) water from the aqueous lithium source (5), and electrochemically extracting (S3) dissolved lithium ions Li+ from the aqueous lithium source (5) in an electrochemical cell which comprises in a housing (1): a working electrode (3), a counter electrode (4) and an electrolyte separating the working electrode (3) and the counter electrode (4). The working electrode (3) comprises a lithium storage material, a binder and an electrically conductive additive, and the dissolved lithium ions Li+ are electrochemically extracted from the aqueous lithium source (5) by intercalating the dissolved lithium ions Li+ into the lithium storage material of the working electrode (3) using the aqueous lithium source (5) as the electrolyte in the electrochemical cell.

: http://publica.fraunhofer.de/dokumente/N-643191.html