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

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 crystallized and shaped solid material, preferably in extruded form, of formula LiXx.2Al (OH) 3, nH2O with n being between 0 , 01 and 10, where x is 1 when X is an anion selected from chloride, hydroxide and nitrate anions, and x is 0.5 when X is an anion selected from sulfate and carbonate anions, comprising a step a ) precipitation of boehmite under specific temperature and pH conditions, at least one shaping step, preferably by extrusion, said method also comprising a final hydrothermal treatment step, all to increase the capacity of lithium adsorption as well as the adsorption kinetics of the materials obtained with respect to the materials of the prior art when it is used in a lithium extraction process of saline solutions.