In order to improve the high temperature performance of magnesia refractory, it can gain high purity magnesium concentrate through the flotation. Because the rising content of magnesium oxide, the difficulty of sintering also increasing. In order to lower sintering temperature of purity magnesia refractory, it should use two-stage firing process. At first, burning the raw material softly, and then, to gain high density clinker through calcination twice in high temperature. In the first soft burning, it can make active powder material. Improving the sintering rate can lower sintering temperature finally. Therefore, for the magnesite’s sintered mechanism, it has an important significant to research the activity of magnesium oxide powder when light roasting.
The abroad done a lot in researching magnesium oxide powder’s activity. They put forward the conductance method to measure. In this aspect, the domestic is also exploring. There is a iodine value adsorption method to measure the activity through using light magnesium oxide. The adsorption method only can detect the indexes relate with superficial area. It can not reflect the real chemical activity. In addition, the conductivity method, solution calorimetry and other generic methods also have disadvantages in many aspects.