Magnesia Alumina Brick

Description

Magnesia alumina bricks are made of magnesia as the main raw material, adding magnesia and alumina as the ground fine powder as the matrix, and firing at a high temperature of 1580~1620°C. On the basis of magnesia bricks, magnesia bricks have improved their thermal shock resistance and high temperature mechanical strength to meet the needs of intensified smelting.

Features

Good slag resistance.
Improved thermal shock resistance.
High temperature mechanical strength.
Increased softening temperature under load.

Magnesia Alumina Brick Composition

Magnesia alumina brick is a spinel-type basic refractory material containing about 85% MgO and 5%-10%. The crystal phase composition of magnesia alumina bricks is mainly periclase, and magnesia-alumina spinel is the matrix. The spinel aggregates form a crystal network after crystallization, which makes the brick structure compact. Since no coarse-grained aggregate is used in the production, the structure of the entire brick body is uniform and the pores are dispersed.

Specification

Project	Index
	ML-80A	ML-80B
MgO (%)	≥80	≥80
Al2O3 (%)	5~10	5~10
0.2MPa load softening start temperature (℃)	≥1600	≥1580
Apparent porosity (%)	≤18	≤20
Normal temperature compressive strength MPa	≥39.2	≥39.4
Thermal shock resistance	≥3	≥3

Application

Magnesia alumina bricks are mainly used in high-temperature melting furnace roofs such as steelmaking open hearth furnaces and reverberatory furnaces, permanent linings for ladles and steelmaking furnaces, glass kiln regenerators, mixed iron furnaces, copper smelting reverberatory kiln roofs and other industrial high-temperature furnaces.