- Time:May 25, 2023
Magnesia carbon bricks are a type of refractory brick made from high-purity magnesia and graphite materials. They have excellent thermal shock resistance, high-temperature strength, and corrosion resistance, making them ideal for use in steelmaking furnaces, converters, and ladles. Here is how magnesia carbon bricks are typically manufactured:
1.Raw material preparation: The raw materials used in magnesia carbon brick production include high-purity magnesia, flake graphite, and a binder such as phenolic resin or pitch. These materials are crushed, ground, and mixed in a specific ratio to produce a homogeneous mixture.
2.Forming: The mixed materials are then formed into the desired shape using different techniques such as pressing, extrusion, or casting. Pressing is the most common method, wherein the mixture is compressed under high pressure using hydraulic presses to form green bricks.
3.Drying: The green bricks are then subjected to a drying process to remove any remaining moisture and improve their strength. The bricks are usually dried at temperatures between 100°C to 150°C in a special drying chamber or on open-air shelves.
4.Carbonization: After drying, the green bricks are heated to a temperature of around 800°C in an electric furnace in an oxygen-depleted atmosphere for carbonization. This process converts the phenolic resin or pitch binder into coke, which provides the carbon component of the brick.
5.Sintering: The carbonized bricks are then sintered at high temperatures (around 1700°C) in a special furnace to bond the magnesia and graphite components together and create a denser structure. During this process, the carbon and magnesia react to form magnesium carbide, which improves the brick's corrosion resistance and thermal conductivity.
6.Finishing: Finally, the sintered bricks are inspected, tested, and cut to the required size and shape. They may also undergo additional treatments such as impregnation with resin or coating with a protective layer to improve their performance in specific applications.
Overall, the manufacturing process of magnesia carbon bricks is complex and requires precise control over temperature, pressure, and other factors to produce high-quality bricks with consistent properties.
