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Fused magnesia has the characteristics of high purity, large crystal grains, dense structure, strong slag resistance, and good thermal shock stability. It is an excellent high-temperature electrical insulation material and is also used for making high-grade magnesia bricks, magnesia carbon bricks, and unshaped An important raw material for refractory materials. Fused magnesite is widely used in metallurgy, chemical industry, national defense, scientific research, aerospace, household appliance components, etc.

fused magnesite
fused magnesite

Fused magnesia physical and chemical properties

The physical and chemical properties of Large Crystal Fused Magnesia (LFM)

Product CodeChemical Composition (Mass Fraction),%Particle Bulk Density g/cm’
MgO≥SiO2≤CaO≤Fe2O3≤Al2O3≤Burn Loss
LFM 9999.000.300.600.350.100.08≥3.51
LFM 98.598.300.400.800.450.120.08≥3.50
LFM 98A97.700.551.100.600.120.10≥3.50
LFM 98B97.500.601.200.650.150.12≥3.49
LFM 97A96.801.002.000.700.150.15≥3.45
LFM 97B96.501.152.300.750.180.20≥3.42

The physical and chemical properties of High-Calcium Electrically Fused Magnesia (HFM (C/S≥2))

Product CodeChemical Composition (Mass Fraction),%Particle Bulk Density g/cm’
MgO≥SiOz≤CaO≤Fe2O3≤Al2O3≤Burn Loss
HFM 9897.700.601.200.650.120.103.50
HFM 9796.800.851.700.750.150.153.48
HFM 9696.001.202.400.850.180.183.45

The physical and chemical properties of Ordinary Fused Magnesia (FM)

Product CodeChemical Composition (Mass Fraction),%Particle Bulk Density g/cm’
MgO≥SiOz≤CaO≤Fe2O3≤Al2O3≤Burn Loss
FM 9897.501.001.500.650.100.10≥3.50
FM 9796.501.302.000.700.150.15≥3.48
FM 9695.502.502.300.800.180.18≥3.45
FM-98 fused magnesite
FM-98 fused magnesite

The specific production process of fused magnesite

In specific industrial production, the raw materials of fused magnesia of different specifications are also different. Ordinary fused magnesia usually uses magnesite directly as raw material, while large crystalline fused magnesia uses light-burnt magnesium as raw material. The equipment adopts Submerged arc furnaces mostly using three regenerated or non-regenerated graphite. The specific process is: feeding → ignition and lifting of electrode → gradual feeding → smelting (magnesite is sintered and melted by the heat generated by high current) → natural cooling → crushing, classification, and sorting → warehousing.

electric arc furnace production of fused magnesia
electric arc furnace production of fused magnesia

Advantages of fused magnesia

It has a complete structure, dense structure, high melting point (up to 2800°C), stable chemical properties, high compressive strength, strong insulation properties, erosion resistance, and corrosion resistance. It is an important raw material for metallurgy, building materials, light industry, furnace lining, and bulk materials. It is also an indispensable and important refractory material in steel, cement, glass, non-ferrous metal smelting, and other industries.

fused magnesia
fused magnesia

Main applications of fused magnesite

fused magnesite
fused magnesite

In the metallurgical refractory industry, it is used to produce auxiliary refractory materials such as high-purity fused magnesia, gunning materials, and ramming materials, as well as special refractory bricks such as flowing steel bricks, magnesia bricks, and magnesia chrome bricks. It can also be used in vacuum and non-vacuum induction It is used as refractory lining on furnaces and electric arc furnaces. It is an ideal raw material for making magnesium oxide crucibles, furnace bladders, and various high-temperature casings.

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