Magnesia bricks have over 90% magnesium oxide content and adopt periclase as the principal crystalline phase. Magnesite Bricks can be divided into two categories of Burnt Magnesia Bricks and Chemical Bonded Magnesite Brick. Magnesite bricks have excellent performance of superior high temperature mechanical strength and volume stability. And can service in the high temperature of 1750℃, Magnesite bricks are ideal products for glass furnace application.
Magnesia bricks can be classified into two types: burnt magnesite brick and chemical bonded magnesite brick. Burnt magnesite bricks are made from raw material of periclase, after fired with 1550~1600℃ high temperature through crushing, mixing, melting and molding. High purity products have over 1750℃ burnt temperature. Unburnt magnesite brick is made of adding suitable chemical agent through melting, molding and drying.
Due to the different chemical composition of magnesia bricks, which can be classified into different types, and all of these bricks are produced by sintering. Based on different raw materials, magnesia bricks can be classified into the following classifications:
Ordinary magnesia brick: sintered magnesite stone.
Direct bond magnesia brick: high purity sintered magnesite.
Forsterite brick: peridotite
Magnesia calcia brick: sintered magnesite containing high calcium.
Magnesia silica brick: high silicon sintered magnesite stone.
Magnesia chrome brick: sintered magnesite and some chrome ore.
Magnesia alumina brick: sintered magnesite stone and Al2O3.
|Items||Physical and Chemical characters|
|MgO % ≥||97.5||97.0||96.5||95.0||94.5||91.0||89.0|
|SiO2 % ≤||1.00||1.20||1.5||2.0||2.5||-||-|
|Apparent Porosity % ≤||16||16||18||16||18||18||20|
|Bulk Density g/cm3 ≥||3.0||3.0||2.95||2.90||2.85|
|Cold Crushing Strength MPa ≥||60||60||60||60||50|
|0.2Mpa Refractoriness Under Load ℃≥||1700||1700||1650||1560||1500|
|Permanent linear change %||1650℃×2h -0.2~0||1650℃×2h -0.3~0||1600℃×2h -0.5~0||1600℃×2h -0.6~0|
Magnesite bricks are suitable for all kind of high temperature furnaces, such as the metallurgical furnaces. In addition, magnesia bricks are widely used in the other thermal equipment, such as hyperthermia tunnel kiln, lining of rotary cement kiln, heating furnace bottom and wall, regenerative chamber of glass furnace, electric furnace bottom and wall and so on.
RS refractory manufacturer is a professional magnesia bricks manufacturer in China, can provide high quality magnesite bricks for you. If you have demand of magnesia bricks, or have some questions on magnesia bricks about physical and chemical indicators , please contact us for free, our sales will contact you as soon as possible.