Patent US7487928 - Grinding balls and their…
10 Feb 2009 Method for manufacturing grinding balls made of fritted ceramic as in particular to spheroid fritted-ceramic balls used in agitator mills, .. E, 68% ZrO2 -, 3.84, 80-80, Market .. US6616873, Dec 1, 2000, Sep 9, 2003, Associated Cement Companies Ltd. Process for making macro porous ceramic spheres.