Method for purifying lithium bicarbonate

C - Chemistry – Metallurgy – 22 – B

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C22B 26/12 (2006.01) B01D 15/36 (2006.01) C01D 15/08 (2006.01)

Patent

CA 2755123

The invention relates to a method for purifying impure lithium bicarbonate by means of a cation exchange resin. In addition to solution purification by ion exchange, the treatment stages include the regeneration of impurity metals bound to the resin. Regeneration consists of washing the resin with water, elution with acid solution, washing with water, neutralisation with alkali solution and washing with water. It is characteristic of the method that neutralisation is performed with sodium hydroxide solution.

L'invention concerne un procédé pour purifier du bicarbonate de lithium impur à l'aide d'une résine échangeuse de cations. En plus de la purification de la solution grâce à l'échange d'ions, les étapes du traitement comprennent la régénération des métaux impurs liés à la résine. La régénération consiste en un lavage de la résine avec de l'eau, une élution avec une solution d'acide, un lavage à l'eau, une neutralisation avec une solution alcaline et un lavage à l'eau. Le procédé se caractérise en ce que la neutralisation est réalisée avec une solution d'hydroxyde de sodium.

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