What does heavy refractory brick and what kind of material does it belong to?

What does heavy refractory brick and what kind of material does it belong to?

Heavy refractory bricks are a relatively broad general term, referring to refractory bricks with high density. They have higher weight and density and are often used in applications where they are subject to high pressures, temperatures or other harsh environments. This type of refractory bricks are usually made of refractory materials such as alumina and aluminum silicate with high content.

Common heavy refractory bricks

1. Clay bricks. The main components of clay bricks are alumina and silica, which are neutral refractory materials. The load softening temperature (the ability of refractory bricks to maintain stability under the combined action of high temperature and load) is 1350 degrees, and the service temperature does not exceed 1000 degrees. It has good resistance to rapid cooling and rapid heating.


2. Mullite bricks use synthetic mullite clinker as granular material and fine powder as synthetic mullite clinker, or use white corundum, quartz powder and pure clay to prepare a mixed fine powder equivalent to the composition of mullite . Mix granular materials and fine powder in proportion. The commonly used ratio is: granular materials 45% ~ 55%, fine powder (<0.088mm) 55% ~ 45%. After uniform mixing, high pressure molding is performed. The firing temperature is 1550~1600℃.

3. Semi-silica brick Semi-silica brick is made of quartz and refractory clay and is a semi-acid refractory material. It is characterized by very little shrinkage of the refired line and good slag resistance (the ability to resist erosion by slag or other molten liquids without being damaged). Mainly used in converters, electric furnaces and iron furnaces.

4. Silica bricks. The silica content in silica bricks is greater than 93%. It is made by adding silica to lime and clay and is an acidic refractory material. Silica bricks have good high-temperature strength and their softening temperature under load is almost close to the refractoriness, but their thermal shock resistance is poor. Mainly used in steel-making furnaces, coke ovens and glass melting furnaces.

5. High alumina bricks, high alumina bricks are aluminum silicate refractory materials with an alumina content greater than 48%, and the other components are silica. Its refractoriness and load softening temperature are higher than those of clay bricks, it has better slag resistance and greater compressive strength.

Heavy refractory bricks usually have good high temperature resistance, wear resistance and corrosion resistance, and are suitable for use in various high temperature industrial furnaces, furnaces and high temperature equipment, such as steel smelting furnaces, glass kilns, cement kilns, etc. Its high density and sturdy structure enable it to withstand long-term use in high pressure and high temperature environments, thereby ensuring stable operation and operation of the equipment.

Generally speaking, heavy refractory bricks are high-performance refractory materials and are widely used in various industrial fields where high temperature resistance, wear resistance, and corrosion resistance are required.

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