In the realm of high-temperature industries, fused magnesia bricks stand out as a crucial component, playing an indispensable role in ensuring the smooth operation of various high-temperature processes. This article aims to comprehensively explore the technical knowledge of fused magnesia bricks, from their raw materials and manufacturing processes to their outstanding properties and practical applications.

Raw Materials and Manufacturing Processes

The primary raw material for fused magnesia bricks is high-purity magnesite. Magnesite with a magnesium oxide (MgO) content of over 95% is often selected to ensure the high quality of the final product. During the manufacturing process, the magnesite is first melted in an electric arc furnace at an extremely high temperature of around 2800°C. This high-temperature melting process helps to eliminate impurities and promote the crystallization of magnesium oxide, resulting in a dense and uniform structure.

After melting, the molten magnesia is poured into a mold and allowed to cool and solidify. The solidified block is then cut and machined into the desired shape and size of the bricks. This manufacturing process ensures that fused magnesia bricks have excellent physical and chemical properties.

Outstanding Properties

Resistance to Basic Slag

Fused magnesia bricks have excellent resistance to basic slag. In high-temperature industrial processes, basic slag is often generated, which can cause severe corrosion to ordinary refractory materials. However, fused magnesia bricks can withstand the erosion of basic slag due to their high MgO content. Tests have shown that in a basic slag environment at 1600°C, the corrosion rate of fused magnesia bricks is only about 1 - 2 mm/year, which is significantly lower than that of many other refractory materials.

High Refractoriness

With a refractoriness of over 2000°C, fused magnesia bricks can maintain their structural integrity and performance in extremely high-temperature environments. This high refractoriness makes them suitable for use in industries such as steelmaking, non-ferrous metal smelting, and cement production, where temperatures can reach up to 1800°C or even higher.

Thermal Stability

Fused magnesia bricks also exhibit good thermal stability. They can withstand rapid temperature changes without cracking or spalling. For example, in a thermal cycling test between room temperature and 1600°C, fused magnesia bricks can endure more than 50 cycles without significant damage, ensuring the long-term stability of high-temperature equipment.

Practical Applications and Value

In the steelmaking industry, fused magnesia bricks are widely used in the lining of converters, electric arc furnaces, and ladles. In a large steel plant, the use of high-quality fused magnesia bricks in the converter lining can extend the service life of the lining from about 1000 heats to over 1500 heats, significantly reducing the frequency of lining repairs and replacements, and improving production efficiency.

In the cement industry, they are used in the rotary kiln lining. The excellent resistance to basic slag and high refractoriness of fused magnesia bricks can effectively resist the erosion of cement clinker and high-temperature gases, ensuring the stable operation of the kiln and improving the quality of cement products.

Comparison with Other Refractory Bricks

Compared with other common refractory bricks, such as clay bricks and high-alumina bricks, fused magnesia bricks have significant advantages. Clay bricks have relatively low refractoriness and poor resistance to basic slag, while high-alumina bricks may not perform as well as fused magnesia bricks in terms of thermal stability and resistance to basic slag in high-temperature and highly corrosive environments.

The following table summarizes the main differences between fused magnesia bricks and other refractory bricks:

Conclusion and Interaction

In conclusion, fused magnesia bricks are an ideal choice for high-temperature industries. Their excellent properties, such as resistance to basic slag, high refractoriness, and good thermal stability, can provide reliable protection for high-temperature industrial equipment, ensuring production safety and efficiency. If you are looking for a high-quality refractory solution for your high-temperature processes, don't hesitate to contact us. We are committed to providing you with the best fused magnesia bricks and professional technical support.

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