Process for the purification of lithium carbonate

C - Chemistry – Metallurgy – 01 – D

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C01D 15/08 (2006.01)

Patent

CA 2313524

Disclosed are methods for preparing high purity lithium carbonate which can be used for pharmaceutical applications, electronic grade crystals of lithium or to prepare battery-grade lithium metal. Lithium carbonate as commercially produced from mineral extraction, lithium-containing brines (2) or sea water, in aqueous solution is used as a feedstock and reacted with carbon dioxide (3) under pressure to form dissolved lithium bicarbonate. Impurities in the lithium carbonate feedstock are either solubilized or precipitated out. Dissolved impurities are physically separated from the lithium bicarbonate using an ion selective means (F), such as an ion exchange material, or by liquid-liquid extraction. Purified lithium carbonate is then precipitated (G).

Cette invention concerne des procédés de production de carbonate de lithium d'une grande pureté pouvant être utilisé pour des applications pharmaceutiques, l'obtention de cristaux de lithium de qualité électronique ou bien de lithium métal de qualité pile électrique. Tel qu'il est produit commercialement à partir de minerai, de saumures (2) ou d'eau de mer, le lithium sert en solution aqueuse de charge d'alimentation et réagit sous pression en présence de dioxyde de carbone (3) pour donner du bicarbonate de lithium. Les impuretés présentes dans la charge de carbonate de lithium sont séparées physiquement du bicarbonate de lithium par un moyen de sélection ionique (F) tel qu'un matériau échangeur d'ions, ou bien sont éliminées par précipité. Le carbonate de lithium purifié est ensuite précipité (G).

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