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Abstract

A combined processing method for the purification of lithium containing solutions, the method comprising the method steps of passing a lithium containing solution to a first purification step in which the lithium containing solution is contacted with a titanate adsorbent whereby lithium ions are adsorbed thereon whilst rejecting substantially all other cations, the recovery of lithium from the adsorbent providing a part-purified lithium containing solution, the part-purified lithium containing solution produced in the first purification step is then passed in whole or part to a second purification step in which a graphene based filter medium is utilised to provide a further purified lithium containing solution.

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