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How to identify converter magnesia carbon bricks

2021-12-08 14:01:14
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The fired magnesia brick uses high-quality sintered magnesia as the main raw material, and the magnesia-carbon brick manufacturer uses pulp as the binder. After kneading and high pressure molding, it is fired in a high temperature tunnel kiln above 1550°C. Has good thermal stability, corrosion resistance and peeling resistance. It is widely used in industrial kilns such as converters and electric arc furnaces as lining refractories. Fused magnesia bricks have the advantages of compact brick structure, high mechanical strength and low impurity content, and are mainly used in the high temperature area of the storage chamber of large glass kilns. Fused magnesite is made by melting high-quality magnesia as raw material, the English name is fused magnesite. It is calcined at high temperature from magnesite, brucite or magnesium hydroxide extracted from seawater. Strong hydration resistance. Burnt magnesia brick


The chemical composition of magnesia bricks varies with the magnesia raw materials used. In the mineral composition of magnesia brick, the main crystal is periclase, which accounts for 80~90% of the mass of magnesia brick. The matrix compounds are magnesium ferrite (MF), magnesium aluminum spinel (MA), forsterite (M2S), calcium forsterite and the like. The eutectic compounds composed of main crystal and matrix include: M-MF, M-MA, M-M2S, MF-M2S, MF-CMS, MA-M2S, MA-CMS, CMS-M2S, etc. Since the main crystal of magnesia brick is strong basic periclase, it has high density (about 3.5g/cm3), less moisture, high molding pressure, low apparent porosity (about 19), and high bulk density (about 2.8g/cm3). . Therefore, multi-mineral composition, strong alkalinity and high density are the remarkable characteristics of magnesia bricks. Converter magnesia carbon brick


The loosening effect caused by the expansion of iron oxides to form spinel can also be made of magnesia-chrome bricks by using synthetic co-sintered materials. In addition, there are unburned magnesia chrome bricks, for example, unburned magnesia chrome bricks combined with inorganic magnesium salt solutions. The production process of unburned magnesia-chrome bricks is simple, the cost is low, and the thermal stability is good, but the high temperature strength is far less than that of fired bricks. In the late 1950s, a so-called "direct-bonded" magnesia-chrome brick was developed. The characteristics of this kind of brick are pure raw materials, high firing temperature, direct bonding between high temperature phases such as periclase and spinel, and low melting phases such as silicate are distributed in islands. Therefore, the high temperature of the brick is significantly improved. Strength and slag resistance. The method of making bricks by co-grinding and calcining the compacts with chrome ore and magnesia is an effective measure to eliminate the loosening effect. Compared with ordinary magnesia-chrome bricks, the magnesia-chrome bricks made by this method have lower porosity and higher compressive strength, softening temperature under load and flexural strength. The magnesia-chrome bricks made of chrome ore-magnesite powder compacts and synthetic magnesia-chrome sand calcined at high temperature have better slag resistance and high-temperature strength than other magnesia-chrome bricks. In addition, there are also fused-cast magnesia-chrome bricks that are directly cast by melting magnesia-chromium materials in an electric furnace (see the microstructure and color pictures). Chrome bricks, etc.


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