Preparation process of mineral material with particular ceria crushing beads containing ceria

摘要

Process of preparation of a crushed mineral material, comprising the steps of: a) providing at least one mineral material, optionally in the form of an aqueous suspension, b) crushing the mineral material, c) optionally sieving and / or concentrating the mineral material grinding obtained after stage (b), d) optionally drying the ground mineral material obtained after stage (b) or (c) characterized in that said grinding during stage (b) is carried out in the presence of grinding beads of zirconium oxide containing ceria having: - a ceria content of between 15 and 18% by weight with respect to the total weight of said bead, and most preferably of about 16% by weight with respect to the total weight of said pearl; and - an average grain size after sintering of the grains that form said beads with a median diameter of less than 1 µm, preferably less than 0.5 µm and most preferably less than 0.3 µm; - and because step b) takes place at a pH above 7; characterized in that the beads have an original diameter of between 0.2 and 1.5 mm, and preferably between 0.4 and 1.0 mm.