Magnesia Alumina Spinel Brick

Magnesia Alumina Spinel Brick

Magnesia Alumina Spinel Brick


Magnesia-Alumina Spinel Brick is in order to improve the heat stability of magnesia brick, add alumina oxide in ingredient to generate the magnesia brick which the main material is magnesia-alumina spinel.

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Product detail

Magnesia Alumina Spinel Brick

Magnesia Alumina Spinel Brick Introduction

Magnesia-Alumina Spinel Brick is in order to improve the heat stability of magnesia brick, add alumina oxide in ingredient to generate the magnesia brick which the main material is magnesia-alumina spinel.

The advantage of magnesia-alumina spinel brick:

Good heat stability, in the process of use, it will have reaction with clinker and produce a thin layer of calcium aluminate maskant, which makes the liquid not easy to penetrate, its anti-stripping performance is better than the direct bonded magnesia chrome brick.

Application of Magnesia Alumina Spinel Brick

1.The magnesia-alumina spinel can be used in the cement kiln, not only avoid the chrome pollution, and has good anti-stripping performance.

2.It can be used in refractory carstables for ladles, which greatly improve the anti-erosion ability. It is widely applied to steel-making refractory material. The preparation of high quality pre-synthertic spinel provide a new material for amorphous and fixed high purity refractory.

Magnesium-alumina spinel bricks have the following advantages.

① The elastic modulus is small, magnesia alumina brick is (0.12~0.228)×105MPa, while magnesia brick is (0.6~5)×105MPa;

② MA can transfer MF from periclase and sweep FeO, and the reaction is as follows:

FeO+MgO • AI2O3→MgO+FeAl2O4

FeO+MgO→(Mg • Fe)O

MA absorbs Fe2O3 and undergoes minor expansion

③ High melting point. The melting point of spinel is 2135 ℃, and the initial melting temperature of periclase is 1995 ℃ higher.

The combination of the two will improve the bonding performance of magnesia bricks.

④ The softening temperature under load is high, but the spinel formation is accompanied by volume expansion, and the ability to aggregate and recrystallize is weak, so a higher firing temperature is required.

⑤ Excellent thermal shock resistance.

⑥ High strength.

⑦ Strong corrosion resistance.

Product Parameters

Items Magnesia Alumina Spinel Brick
MA-12A MA-12B MA-12C MA-18
MgO% 80 75 70 60
SiO2% 1.0 1.0 1.5 1.0
Al2O3% 12 12 12 18
Bulk density(g/cm³) 2.95 2.90 2.90 2.85
Apparent porosity 18 18 18 18
Cold Crushing strength Mpa 40 40 40 40
Refractoriness under load 0.2Mpa 1650 1650 1650 1650
Thermal shock resistance(950℃air cool times) 40 40 40 40
Application Severe corrosion area Larger than 5000mt/d kiln capacity Economic solution Severe corrosion area

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