Magnesia

Electrofused magnesia is produced by melting special Grade A natural magnesite or high purity lightweight magnesite particles in an electric arc furnace. The product has high purity, large crystal particles, compact structure, strong slag resistance material, good thermal shock stability, is an excellent high temperature electrical insulation material, and is also an important raw material for the production of high-grade magnesia bricks, magnesia carbon bricks and amorphous refractory materials.

It can give full play to the good properties of magnesite. It is found in the use of magnesia for magnesia carbon brick and sintered magnesia that the slag erosion begins at the interface of the magnesite crystallization, so the large crystallization of magnesite is much more resistant to erosion than the microcrystalline sintered magnesite. Magnesia is mostly used as raw material for higher magnesia-carbon refractory products. Natural magnesite, light fired magnesia (containing natural or sea (halogen) water) or sintered magnesite fused by arc furnace of alkaline refractory materials. It is made of magnesite, magnesite or magnesium hydroxide extracted from sea water by calcination at high temperature. These alternative materials were priced above the magnesia price a year ago, but are now priced far below the magnesia price and are relatively abundant. The buyer needs to reduce, thus achieving a balance between supply and demand. Electrofused magnesia is made of specially selected grade A natural magnesite or high purity lightly burnt magnesite particles. Made by melting in an arc furnace. The product has high purity, large crystal particles, compact structure, strong slag resistance material, good thermal shock stability, is an excellent high temperature electrical insulation material, and is also an important raw material for the production of high-grade magnesia bricks, magnesia carbon bricks and amorphous refractory materials.

It is a general term for the products of magnesite raw materials such as magnesite which have reached the sintering level after high temperature treatment. The magnesite fired with natural magnesite as raw material is called sintered magnesite by one-time calcining or two-step calcining process with high temperature equipment such as shaft kilns and rotary kilns. The magnesite which is formed after melting in an arc furnace is called electrofused magnesite. The magnesium oxide obtained from seawater is called seawater magnesia. Magnesia is one of the most important raw materials of refractories. It is used for manufacturing various magnesia bricks, magnesia alumina bricks, ramming materials, charging materials and so on. Containing more impurities, used for paving the bottom of the steel furnace.

More pure magnesite, light burned magnesite (containing natural magnesite or sea (brine) water) or sintered magnesite are used for melting in the arc furnace, and the melt is naturally cooled. The magnesite crystals crystallize and grow from the melt. Due to the use of high purity raw materials, silicate impurity content is low, so the direct binding degree of calcite crystal is high, can give full play to the good properties of calcite. It is found in the application of electrofused magnesia and sintered magnesia that the slag erosion begins at the interface of magnesite crystallization, so the large crystallization of electrofused magnesite is much more erodibility than that of the microcrystalline sintered magnesite. Fused magnesia is mostly used as raw material for higher magnesia-carbon refractory products.