| PATENT ASSIGNEE'S COUNTRY | France |
| UPDATE | 07.99 |
| PATENT ASSIGNEE | Air Liquide SA |
| PATENT CLAIMS |
Process for the purification of soln of Li salts contaminated by metallic cations other than Li - Passing a soln to be purified through an exchange zone packed with a zeolite adapted to exchange Li cation with said metallic cation other than Li, said zeolite being initially loaded with > 95% Li cation & having a better affinity for said metallic cation other than Li than for Li cation, so as to fix all the contaminating metallic cation on said zeolite by displacement of Li cation, whereby the soln of Li salts reco vered at the outlet of said exchange zone is stripped of said contaminating metallic cation - Regenerating said zeolite by replacing the contaminating metallic cation fixed on said zeolite with Li cation, by a) Con tacting the zeolite with soln contg ammonium cation, where by all the metallic cations fixed on said zeolite are displa ced by ammonium cations; b) Heating the zeolite to 150- 350C, whereby said zeolite is converted to its acid form giving off ammonia; c) Contacting the acid zeolite with aq soln of LiOH |
| PATENT PHOTOCOPY | Available on request |
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