Factors Affecting the Activity of MgO Powder Decomposed by Calcinating Magnesite Peng Changqi;Cui Kehao;Cui Chong;Zhang Naizhi;Huang Youzheng Dept. of Material Science, WUT Huangzhou Communication BureanThe MgO powder decomposed from the magnesite from Haicheng area, Liaoning Province and Yexian area,Shandong Province differs in the activity. On the basis of the petrography study, this disparity is mainly due to difference in the structure and associated mineral of the ore,that arouse Yexian ore to decompose easily and periclase to crystallize perfectly under lower temperature.magnesite;;calcination;;MgO powder;;activity