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Magnesia Alumina Brick

Magnesia Alumina Brick

Magnesia Alumina Brick (MA) is an alkaline refractory material made of magnesia and industrial aluminum oxide or bauxite as raw materials, crushed and shaped, and sintered at about 1600°C. The refractories are greater than 2000°C, and the resistance to thermal shock resistance is better than that of Magnesia Brick(MZ), and it can resist the erosion of alkaline slag. It is used to build the top of alkaline open hearth furnace and electric furnace for steelmaking.
Magnesia-alumina brick is mainly composed of periclase and magnesia-alumina spinel as matrix. It is better in thermal shock resistance than magnesia brick. In order to improve the thermal shock resistance of magnesia brick, alumina or bauxite clinker fines are introduced into the ingredients to form magnesia alumina spinel matrix, thus making magnesia alumina brick. Magnesia Alumina Brick are characterized by good Thermal Shock Resistance (TSR), high temperature of Refractoriness under Load (RUL), RUL above 1580°C, and good glass corrosion resistance. With the increase of the content, the apparent porosity of the brick increases. However, when the content is less than 10%, the brick is still relatively dense, and the apparent porosity can reach 14%, generally 15%~18%.

 

Compared with Magnesia Brick (MZ), Magnesia Alumina Brick has the following characteristics:
1. Magnesia Alumina Brick have good Thermal Shock Resistance, and water cycles for 20-25 times, or even higher. This is its most prominent advantage, much better than ordinary Magnesia Brick. 
2. The main performance of Magnesia Alumina Brick is also slightly stronger than that of Magnesia Brick. Due to the high melting point of magnesia-alumina spinel itself, the RUL of Magnesia Alumina Brick is better than that of magnesia brick, reaching 1620~1690°C.

The ability of magnesia alumina spinel to protect periclase particles from slag erosion is stronger than that of calcium-magnesium olivine, so the ability of Magnesia Alumina Brick to resist alkaline slag and iron oxide slag is stronger than that of Magnesia Brick.

Magnesia Alumina Brick

It is made primarily of magnesia, with a few high alumina bauxites, pressed under high pressure and produced by medium temperature firing. It is an upgrade of pure Magnesia Brick (MZ). Compared with magnesia brick of same substrate, it has higher RUL, resistance to slag penetration and thermal shock as well as high temperature mechanical flexibility. It was widely used as working lining and safety lining at non-critical parts of traditional metal smelting furnace (such as open-hearth furnace, convertor and non-ferrous smelter) as well as small and medium size Glass Regenerator.

%E4%B8%8B%E8%BD%BD We can produce as Harbinson Walker International standard Magnesia Alumina Brick (MA)

rhimagnesita We can produce as RHI Magnesita standard Magnesia Alumina Brick (MA)

Refrateknik1 We can produce as Refratechnik standard Magnesia Alumina Brick (MA)

OSYMEN

MgO

Al2O3

A.P

B.D

C.C.S

R.U.L

T.S.R

1100°C Water

%

%

%

g/cm3

MPa

(Ta)°C

Cycles

MA-90A

87.0

6-9

18.0

2.95

50

1620

4

MA-90B

84.0

6-9

19.0

2.95

45

1600

4

MA-90C

80.0

6-8

19.0

2.90

45

1550

4

 AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load  |  TSR: Thermal Shock Resistance

Last updated: 2024-01-03
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