Hi,
I have a leach solution with Li present as LiOH. I did lime water leaching of material but also leached impurities such as Zn, Cr and Al with it. The pH of the solution is around 11. Now I want to remove the impurities and the literature suggests using ion exchange resins to remove them. The ion exchange resins would require pH adjustment to around 6-7 which might also alter the chemistry of dissolved LiOH, and I do not want that. So how should I proceed? Is there any other way I should explore to remove those impurities?
in fact the following is the Coplilot AI answer
https://sl.bing.net/xH5OuBVec8
A cation exchange resin will work at pH 11. The lithium ion is separable from the other multivalent cations in your system because those have a higher affinity for the resin. I expect that the resin will saturate with Li+ relatively quickly, then the multivalent cations will gradually displace the Li+. Until the multivalent cations break through, it seems the effluent will be a dilute solution of LiOH (similar to the feed), which may suit your purpose. Upon regeneration with a mineral acid, because the Li+ is less tightly held, it will elute (as a concentrated solution) ahead of the multivalent cations. Of course the particular lithium salt in the eluent is determined by the acid used, e.g., HCl would give lithium chloride. A quick search brought up a paper that is not quite the same as your situation (for example, pH is 3), but still illustrates the concept: https://repositorio-api.ipen.br/server/api/core/bitstreams/e30a61da-4662-4b35-8c49-bd0ff0f5eae1/content Hope this helps.
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