### Effects of grinding of the feldspar in the sintering using a planetary ...

The planetary ball mill has two50 cm 3 bowls; each bowl has seven stainless steel balls and a diameter of 15 mm. Therefore, the operation parameters were the following. Each bowl was filled with 6 g of anorthoclase feldspar; rotational speed was set to 800 rpm; grinding time was set to 15, 30, 45, 60 and 120 min; the mill was allowed to run ...