Magnesia Alumina Spinel Brick Introduction

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.

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.

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.