The Performance and Application of Magnesia Brick

August 15, 2023

Magnesia brick, a type of refractory material, has been a crucial component in various industries for many years. Its exceptional properties and versatility make it an indispensable material in applications where high temperatures, corrosion resistance, and durability are required. In this article, we will explore the performance and application of magnesia bricks, shedding light on their role in industries such as steel, cement, and glass production.

Magnesia alumina brick

Understanding Magnesia Brick

Magnesia bricks are primarily composed of magnesite, a naturally occurring mineral rich in magnesium oxide (MgO). This unique composition gives magnesia bricks several outstanding characteristics:

1. High Melting Point: Magnesia bricks can withstand extremely high temperatures, making them ideal for industries involving intense heat, such as steel manufacturing.

2. Corrosion Resistance: They are highly resistant to chemical corrosion, especially by basic slag, which is crucial in the production of steel and cement.

3. Thermal Insulation: Magnesia bricks possess excellent thermal insulation properties, ensuring energy efficiency in high-temperature processes.

4. Low Thermal Expansion: Their low thermal expansion rate minimizes the risk of cracking and structural damage under extreme heat.

Applications of Magnesia Brick

1. Steel Industry

One of the most prominent applications of magnesia bricks is in the steel industry, particularly in the construction of steelmaking furnaces and ladles. The refractory lining of these furnaces faces extreme conditions, including high temperatures and chemical reactions. Magnesia bricks' resistance to both heat and basic slag corrosion makes them an ideal choice for these critical areas. They help maintain the integrity of the furnace lining, ensuring consistent and efficient steel production.

2. Cement Industry

The cement industry relies on magnesia bricks in the construction of rotary kilns, which are essential for clinker production. These kilns operate at temperatures exceeding 1,400°C, and magnesia bricks excel in such harsh conditions. Their ability to withstand high temperatures and resist the corrosive effects of alkaline materials is vital for prolonged kiln life and cost-effective cement production.

3. Glass Industry

In the glass industry, magnesia bricks are used to line regenerators and glass melting furnaces. Glass production involves extremely high temperatures, and these bricks provide both excellent heat resistance and minimal thermal expansion, ensuring the stability of the furnace structure and prolonged service life.

4. Non-Ferrous Metallurgy

Magnesia bricks also find applications in non-ferrous metallurgy, such as in the construction of copper and nickel smelting furnaces. These furnaces operate at elevated temperatures, and the resistance to corrosion and thermal stress exhibited by magnesia bricks is indispensable for their performance and longevity.

Challenges and Considerations

While magnesia bricks offer numerous advantages, they are not without challenges. One significant issue is their susceptibility to hydration when exposed to moisture. This can lead to a phase transformation, resulting in a volume increase and cracking. Therefore, proper storage and handling are crucial to maintaining the integrity of magnesia bricks.

Additionally, the cost of magnesia bricks can be relatively high compared to other refractory materials. This cost should be balanced against the benefits they provide in terms of performance and longevity, especially in high-temperature and corrosive environments.


Magnesia bricks are a fundamental component in various industries, where their exceptional properties make them indispensable for applications involving high temperatures, corrosion resistance, and durability. From the steel and cement industries to glass production and non-ferrous metallurgy, magnesia bricks play a vital role in ensuring the efficiency and longevity of critical equipment. While they come with certain challenges, their overall performance and reliability make them a preferred choice for these demanding applications. As industries continue to evolve and demand even greater performance from refractory materials, magnesia bricks are likely to remain at the forefront of innovation and application. We are a magnesia brick supplier. If you are interested in our products, please contact us now!

Contact Us

+86 189 5430 6666

+86 189 5430 6666

Building B, Kerry Centre Enterprise Square, No.125 Qingnian Street, Shenhe District, Liaoning Province, China.

Copyright © Liaoning Mingshi Refractory Co., Ltd. All Rights Reserved | Sitemap | Technical Support: Reanod