This study is aimed to determine the grindability and kinetic behavior on grinding of vitrified sanitary ware wastes. The specific rates of breakage (S-i) and the model parameters were determined through kinetic experiments to understand the grinding mechanisms of vitrified wastes. The breakage behaviors were determined experimentally by using mono-size fraction technique. The mono-sized samples of -2360+1700 mu m, -1180 + 850 mu m, and -425 +300 mu m were ground batchwise for the selected periods to determine the S-i. At the end of each grinding period, using the material at different mono-size groups, particle size distributions and breakage behaviors of the products were determined. Depending on the grinding periods in both of the mills, energy consumptions and d(80) values of grinding products obtained by varying grinding periods were determined. It was acquired that as the size group decreases breakage speed gets slower in the ball mill and increases in the stirred mill. An increase in the grinding period results in an increase in energy consumption, but there is no significant change in d(80) size in grinding of vitrified waste in the ball mill. However, it was found that d(80) size significantly decreases depending on the increasing grinding period in the stirred mill.