GRINDING BALLS AND PRODUCTION METHOD THEREOF

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The invention relates to sintered ceramic grinding balls comprising the following compounds (by wt.-%) : 18 to 50 wt.- % mullite (3Al2O3.2SiO2); 9 to 25 wt.- % zirconium (ZrO2 + HfO2) stabilised by 0.5 to 3 wt.- % rare earth oxide; and 25 to 72 wt.- % alumina (Al2O3).