PROCESS FOR PREPARING SYNTHETIC MINERAL PARTICLES AND COMPOSITION COMPRISING SYNTHETIC MINERAL PARTICLES

摘要

The invention relates to a process for the preparation of synthetic mineral particles of formula: (AlyM1-y) 2 (SixGe1-x) 2 O5 (OH) 4 in which: M denotes at least one trivalent metal chosen from the group consisting of gallium and rare earths, process in which: - a precursor gel of said synthetic mineral particles is prepared by a co-precipitation reaction between: at least one salt of a metal selected from aluminum and M, at least one source silicon selected from the group consisting of potassium metasilicate, sodium metasilicate, potassium metagermanate and sodium meta-manganate. ○ the molar proportion (AllyM1-y) / (SixGe1-x) during the preparation of said precursor gel being equal to 1, - a solvothermal treatment is carried out of said precursor gel at a temperature between 250 ° C and 600 ° C. The invention also relates to a composition obtained by this method.