Method for manufacturing crystals of aluminate of at least one metal and/or one metalloid and/or one lanthanide, and applications of same

Method for manufacturing crystals of aluminate of one or more elements other than aluminium (Al), denoted “A”, independently chosen from a metal, a metalloid or a lanthanide, said method comprising at least the following steps:

• (1) putting in suspension starting reagents comprising at least:
• a source of the element aluminium and a source of said element or elements A that has a degree of oxidation ranging from 1 to 6, in a liquid medium, so as to form a suspension referred to as the “starting suspension”, the mass concentration of the starting reagents being between 10 g/l and 1000 g/l;
• (2) the milling of said starting suspension at an ambient temperature of less than or equal to 50° C., in a three-dimensional liquid-medium microbead mill for a holding time of equal to or less than 5 min;
• (3) the recovery, at the discharge of said three-dimensional microbead mill, a suspension called the “final suspension” comprising said starting reagents in activated form or crystals of aluminate of said element or elements A;
• (4) optionally, the drying or shaping of a concentrate of the final suspension obtained at the end of step (3), so as to obtain a powder or a concentrate comprising, respectively, said starting reagents in activated form or said crystals, of aluminate of said element or elements A;
• (5) the calcination of said final suspension obtained at the end of step (3) when it comprises said starting reagents in activated form, or of the powder or concentrate obtained at the end of step (4) when it comprises said starting reagents in activated form, so as to obtain crystals, of aluminate of said element or elements A.