PROCESS FOR THE PREPARATION OF AN ADSORBENT MATERIAL COMPRISING A PRECIPITATION STEP OF BOEHMITE OPERATING UNDER SPECIFIC CONDITIONS AND METHOD FOR EXTRACTING LITHIUM FROM SALINE SOLUTIONS USING THE SAME

摘要

The present invention relates to the field of solid materials for the adsorption of lithium. In particular, the present invention relates to a new process for the preparation of a solid material which is crystallized and shaped, preferably in the form of extrudates, of formula LiXx.2Al (OH) 3, nH2O with n being between 0 , 01 and 10, x being equal to 1 when X is an anion chosen from chloride, hydroxide and nitrate anions, and x being equal to 0.5 when X is an anion chosen from sulfate and carbonate anions, comprising a step a ) of boehmite precipitation under specific temperature and pH conditions, at least one shaping step, preferably by extrusion, said method also comprising a final hydrothermal treatment step, the whole making it possible to increase the capacity of adsorption of lithium as well as the adsorption kinetics of the materials obtained compared to the materials of the prior art when the latter is used in a process for the extraction of lithium from saline solutions.