What is fused magnesia?

Natural magnesite, lightly burned magnesium oxide (containing natural or marine (brine) water), or sintered magnesium sand are alkaline refractory raw materials melted in an electric arc furnace. Made by high-temperature calcination of magnesite, brucite, or magnesium hydroxide extracted from seawater. Strong resistance to hydration.

Chinese name: fused magnesia, foreign name: fused magnesite, discipline: metallurgical engineering category: refractory materials, raw materials: magnesite, brucite, Mohs hardness 5.5

The general term for the products produced by high-temperature treatment of magnesia based raw materials such as fused magnesia and magnesite to achieve sintering degree. Magnesia sand produced by using high-temperature equipment such as vertical kilns and rotary kilns for one-time or two-step calcination processes, using natural magnesite as raw material, is called sintered magnesia sand; The electric fused magnesia sand is formed by melting magnesite and other raw materials in an electric arc furnace and cooling them to a molten state; The product made by extracting magnesium oxide from seawater is called seawater magnesia sand. Magnesia is one of the most important raw materials for refractory materials, used to manufacture various magnesia bricks, magnesia aluminum bricks, ramming materials, furnace repair materials, etc. Containing a lot of impurities, used for laying the bottom of steelmaking furnaces, etc.

High purity magnesium sand is made by flotation purification of natural high-grade magnesite ore, followed by light burning, fine grinding, ball pressing, and ultra-high temperature oil vertical kiln calcination. It is a high-quality raw material for brick making and refractory materials.

Medium grade magnesia sand is produced from lightly burned magnesium oxide with a MgO content of 97% through processes such as ball pressing and high-temperature vertical kiln calcination. The product has good sintering degree and dense crystallization, making it a high-quality raw material for producing mid-range magnesium refractory products.

Electric fused magnesia is made by melting selected special grade natural magnesite or high-purity lightly burned magnesium particles in an electric arc furnace. This product has high purity, large crystalline particles, dense structure, strong slag resistance, good thermal shock stability, and is an excellent high-temperature electrical insulation material. It is also an important raw material for producing high-end magnesium bricks, magnesium carbon bricks, and amorphous refractory materials.