Process for milling compounds

摘要

The present invention is a process for the preparation of a solid particles of a compound. The process includes milling the compound in the presence of milling media composed of ceramic particles having an average size of 0.1 to 20 mm. The ceramic particles are composed of a tetragonal zirconia core and a continuous hard case shell comprising cubic zirconia, monoclinic zirconia, spinel or zircon.