Low Temperature Porcelain Tiles Prepared Using a Lithium · with an alumina medium in a nylon jar for 8 h The speed of the roller ball mill WZM 1 Haoqiang Yixing China was set to 90 r/min The slips were then dried in an oven at 110 C for 12 h and the dried cakes were crushed and passed through an 80 mesh sieve Humidification using 7 8%