Magnesite at 1800 ℃ calcination, carbon dioxide completely escape, magnesium oxide periclase formed dense block, weighing burning magnesium (also called sintered magnesite), the dead-burned magnesium has the very high refractoriness. Its main ingredients for magnesium oxide, select natural super magnesite writing flotation purification, light burned, fine grinding, high pressure ball, ultra high temperature oil shaft kiln calcine.