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

A method for manufacturing crystals of aluminate of one or more elements other than the element aluminum, the one or more other elements being independently chosen from one of 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 aluminum and a source of said one or more other elements that has a degree of oxidation ranging from 1 to 6, in a liquid medium, to form a starting suspension, the starting reagents having a mass concentration between 10 g/l and 1000 g/l;
• (2) milling said starting suspension at an ambient temperature of less than or equal to 50° C., in a three-dimensional liquid-phase microbead mill for a holding time of equal to or less than 5 min;
• (3) recovering, at a discharge of said three-dimensional microbead mill, a final suspension comprising said starting reagents in activated form or crystals of aluminate of said one or more other elements;
• (4) optionally, drying or shaping a concentrate of the final suspension obtained at the end of step (3), to obtain a powder or a concentrate comprising, respectively, said starting reagents in activated form or said crystals, of aluminate of said one or more other elements;
• and
• (5) calcinating said final suspension obtained at the end of step (3) when the final suspension comprises said starting reagents in activated form, or calcinating the powder or concentrate obtained at the end of step (4) when the final suspension comprises said starting reagents in activated form, to obtain crystals of aluminate of said one or more other elements.