What is the difference between medium grade magnesia and calcined magnesia

What is the difference between medium grade magnesia and calcined magnesia

Medium grade magnesia is the main raw material selected, which contains 92% magnesium oxide. The magnesium oxide is pressed into balls by a ball press. The shape of the light burned magnesia powder ball is 30mm. The 30mm magnesia ball is calcined in the high-temperature oil shaft kiln or coke shaft kiln. The calcined products are called medium grade magnesia. The medium grade magnesia is mainly used to produce high-grade alkaline shaped or amorphous refractories, and the finished products are mainly used in metallurgy, building materials, non-ferrous, chemical and other industries. In addition, medium grade magnesia is used in metallurgy to make metallurgical powder to join furnace bottom and wall, and to make slurry spraying furnace lining: to make magnesia bricks and magnesia chrome bricks; In addition to being used as furnace bottom lining, it is also widely used in electric steelmaking furnace, heating furnace, non-ferrous metal converting furnace and rotary furnace.

The calcined magnesia is mainly composed of magnesite ore with a content of more than 46%. The magnesite ore is calcined in a high temperature shaft kiln and heated to 1400-1800 ℃ when Mg (CO3) is completely decomposed to produce periclase, which becomes hard reddish brown calcined magnesium with high fire resistance. It is an ideal raw material for the production of unshaped refractory materials, and the products are used for steel making open hearth furnace, electric furnace bottom and ramming furnace lining.