Characteristics and applications of mullite bricks

Characteristics and applications of mullite bricks

Mullite brick is a high-alumina refractory material with mullite as the main crystal phase. It has a variety of excellent physical and chemical properties and is widely used in many industrial fields. The following is a detailed introduction to the characteristics and applications of mullite bricks:

Characteristics of Mullite Bricks

High refractoriness: Mullite bricks have extremely high refractoriness, usually reaching above 1790℃, and can work stably for a long time in a high temperature environment without cracking or deforming due to thermal expansion or thermal contraction.

Good thermal shock resistance: Mullite bricks have excellent thermal shock stability, can maintain structural stability under rapid temperature changes, and are not easily damaged by thermal shock.

Strong chemical stability: Mullite bricks have good resistance to most chemicals such as acids, alkalis and molten metals, and are not easily damaged by the erosion of these substances.

Excellent mechanical properties: Mullite bricks have high compressive strength, flexural strength and wear resistance, and can be used for a long time in complex working environments.

Stable high temperature performance: The high temperature performance of mullite bricks mainly depends on the content of alumina and the uniformity of the distribution of mullite phase and glass, which enables it to maintain stable performance at high temperatures.

Application of Mullite Bricks

Mullite bricks have been widely used in many industrial fields due to their excellent performance:

Metallurgical industry:

In the metallurgical industry, mullite bricks are mainly used for the lining and insulation layer of blast furnaces, converters, electric furnaces and other equipment. They can withstand high temperatures and chemical erosion to ensure the normal operation of the equipment.

In hot blast furnaces, mullite bricks are used in the hot blast pipe suspension and orifices, pipe vertical pipes and straight pipes with higher temperatures to improve the thermal efficiency and service life of the hot blast furnace.

Glass industry:

Mullite bricks are used as refractory materials for glass melting furnaces in the glass industry, and can withstand high temperatures and the erosion of molten glass.

It is also used in the main channel, regenerator and clarifier wall of glass kilns to improve the quality and efficiency of glass production.

Ceramic industry:

Mullite bricks are used as kiln materials in the ceramic industry, such as saggers, etc., which can withstand high temperatures and chemical erosion to ensure the firing quality of ceramic products.

It is also used in the production of ceramic industry kilns to improve the service life and thermal efficiency of the kilns.

Petrochemical industry:

Mullite bricks are used as lining and insulation layer of reactors in the field of petrochemical industry, and can withstand high temperature and erosion of corrosive substances.

It is also used in dead corner furnace lining and other parts of petroleum cracking system to improve the corrosion resistance and service life of equipment.

Building materials industry:

Mullite bricks are used in the building materials industry for the lining of cement rotary kilns, lime rotary kilns and other equipment, and can withstand high temperatures and friction erosion of materials.

Power industry:

Mullite bricks are used in the power industry for lining and insulation of high-temperature boilers, incinerators and other equipment to protect the equipment from high temperatures and corrosion.

In addition, according to the different volume densities, mullite bricks can also be divided into light mullite bricks and heavy mullite bricks. Light mullite bricks have lower density and better thermal insulation performance, and are often used in the insulation layer of industrial kilns; while heavy mullite bricks have higher density and better wear resistance, and are often used in parts that need to withstand higher mechanical stress.

In summary, mullite bricks play an important role in high-temperature industries with their excellent performance and wide application fields. With the continuous advancement of science and technology and the continuous expansion of the industrial field, the application prospects of mullite bricks will be broader.