Abstract: The powder of calcinated magnesite was obtained by calcinating(850℃) and grinding process. The power was utilized as a binding additive to produce green pellets. The effect of the calcinated magnesite on the burst temperature of the green pellets was investigated. The results showed that the burst temperature of the green pellets increased gradually with the increase of the mass fraction of the calcinated magnesite in the green pellets. When the mass fraction of the calcinated magnesite increased from 0% to 20%， the largest increase of the burst temperature was up to 200℃. The main reasons were as follows:with the addition of the binding additive (calcinated magnesite)， the speed of waterevaporation within the green pellets decreased which led the vapor pressure of inside the green pellets to be relatively small， and the strength of the green pellets increased rapidly in the drying process， which lead the burst temperature of the green pellets increased gradually.

Key words: calcinated magnesite, green pellet, burst temperature, dehydration ratio, strength