In the production process of magnesia carbon bricks, the selection of raw materials is crucial, mainly including magnesia sand, graphite and binder. The quality and ratio of these raw materials directly affect the performance and service life of magnesia carbon refractory bricks.
As the main raw material of magnesite carbon bricks, the quality of magnesia sand has a decisive influence on the performance of the product. High-quality magnesia sand should have the characteristics of low impurity content, high purity and good crystal development. In the production of magnesium carbon bricks, magnesia sand with larger grains and less impurities is usually selected to improve the stability and resistance to slag erosion of the product. In addition, the particle ratio of magnesia sand also has a great influence on the performance of magnesia carbon refractory bricks. Reasonable particle ratio can improve the density and strength of the brick body.
Graphite is another important raw material for magnesia carbon bricks. With its excellent physical properties, such as non-wetting of slag, high thermal conductivity and low thermal expansion, it plays a key role in the production of magnesia carbon firebricks. The purity of graphite has a great influence on the performance of magnesia carbon fire bricks, so high-purity graphite with a carbon content greater than 95%, preferably greater than 98%, should be selected. In addition, carbon black is also often used in the production of magnesia carbon refractories bricks to improve its anti-stripping and increase the residual carbon content.
Binder is a key material for the production of magnesia carbon bricks, which is used to tightly combine raw materials such as magnesia sand and graphite. Commonly used binders include coal tar, coal tar and petroleum asphalt. These binders have good adhesion and thermal stability, and can maintain the structural integrity and stable performance of the brick body at high temperatures.
In summary, the selection of raw materials for magnesia carbon refractory bricks is crucial to their performance. By strictly selecting high-quality magnesia sand, graphite and binders, and reasonably controlling their ratios and process parameters, magnesite carbon brick products with excellent performance and long service life can be produced.
