Fused Magnesia Manufacture

Fused magnesia has the characteristics of high purity, large crystal grains, dense structure, kaha te parenga para, me te pai o te whakapumautanga o te waiariki. It is an excellent high-temperature electrical insulation material and is also used for making high-grade magnesia bricks, pereki waro magnesia, and unshaped An important raw material for refractory materials. Fused magnesite is widely used in metallurgy, ahumahi matū, national defense, scientific research, aerospace, household appliance components, etc.

Fused magnesia physical and chemical properties

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

Product Code	Chemical Composition (Mass Fraction),%						Particle Bulk Density g/cm’
Product Code	MgO≥	SiO2≤	CaO≤	Fe2O3≤	Al2O3≤	Burn Loss	Particle Bulk Density g/cm’
LFM 99	99.00	0.30	0.60	0.35	0.10	0.08	≥3.51
LFM 98.5	98.30	0.40	0.80	0.45	0.12	0.08	≥3.50
LFM 98A	97.70	0.55	1.10	0.60	0.12	0.10	≥3.50
LFM 98B	97.50	0.60	1.20	0.65	0.15	0.12	≥3.49
LFM 97A	96.80	1.00	2.00	0.70	0.15	0.15	≥3.45
LFM 97B	96.50	1.15	2.30	0.75	0.18	0.20	≥3.42

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

Product Code	Chemical Composition (Mass Fraction),%						Particle Bulk Density g/cm’
Product Code	MgO≥	SiOz≤	CaO≤	Fe2O3≤	Al2O3≤	Burn Loss	Particle Bulk Density g/cm’
HFM 98	97.70	0.60	1.20	0.65	0.12	0.10	3.50
HFM 97	96.80	0.85	1.70	0.75	0.15	0.15	3.48
HFM 96	96.00	1.20	2.40	0.85	0.18	0.18	3.45

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

Product Code	Chemical Composition (Mass Fraction),%						Particle Bulk Density g/cm’
Product Code	MgO≥	SiOz≤	CaO≤	Fe2O3≤	Al2O3≤	Burn Loss	Particle Bulk Density g/cm’
FM 98	97.50	1.00	1.50	0.65	0.10	0.10	≥3.50
FM 97	96.50	1.30	2.00	0.70	0.15	0.15	≥3.48
FM 96	95.50	2.50	2.30	0.80	0.18	0.18	≥3.45

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

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, sima, karaihe, whakarewa kore-ferrous whakarewa, and other industries.

Main applications of 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, pereki magnesia, a pereki chrome magnesia. 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.