In order to improve high-temperature behavior of magnesia refractory material, it can obtain the high purity MgO concentrate(magnesite). Because the content of magnesium oxide has been improved, the sintering become more difficult. In order to reduce the sinter point of high pure magnesia refractory material, it selects calcination again. Firstly, it should roast the raw material lightly, and then it can obtain high-density clinker after the second roasting under high temperature. In the first roasting, it can make active powdery matter, and improve sintering rate. Finally, it can reduce sinter point. Therefore, for researching the sintered mechanism of magnesite, it has great significance for researching the method of detecting magnesium oxide powder.
In the aspect of research the activity of magnesium oxide powder, foreign person done a lot of works. They putted forward conductivity method to detect. In domestic, it is in researching. The adsorption method just can obtain some indexes related with superficial area, and can not reflect the true chemical activity. And the conductivity method, dissolution heat method and other general methods have shortcomings in effecting active magnesium oxide.