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Brief introduction of magnesia carbon brick

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Brief introduction of magnesia carbon brick

Date:2018-05-03 Author: Click:

Magnesia carbon brick is a high melting point basic oxide Magnesium Oxide (melting point 2800 C) and high melting point carbon material which is difficult to be embellish by the slag as the raw material, adding a variety of non oxide additives. Non carbonaceous composite refractories made from carbon binder. Magnesia carbon bricks are mainly used for lining of converter, AC arc furnace, DC electric arc furnace, slag line of ladle and so on. As a composite refractory, magnesia carbon brick has effectively used the strong slag erosion ability of magnesia and high thermal conductivity and low expansibility of carbon, which compensates the biggest disadvantage of poor exfoliability of magnesia. The main characteristics are as follows: 1 has good high temperature resistance, 2 slag resistance, 3 resistance to thermal shock resistance, 4 high temperature creep and low temperature creep properties of magnesia carbon brick to produce magnesia carbon brick, the quality of magnesia is very important to the properties of magnesia carbon brick. Magnesia has fused magnesia and sintered magnesia, which have different characteristics. Fused magnesia: grain size is large, impurities are few, silicate phase is small, grain direct bonding degree is high, grain boundaries are few. Sintered magnesia: grain is fine, impurity is more than silicate phase, and the degree of direct bonding is poor. For magnesia material, besides chemical composition, high density and large crystallinity are required in structure and structure. Therefore, as the quality index of magnesia material for producing magnesia carbon bricks, the following contents 1, 2 impurities of Magnesium Oxide content (purity), especially the density of.C/S and B2O3 content of 3 magnesia sand, pore diameter and porosity should be investigated. Form and so on (sinter). 

The purity of magnesia has great influence on slag resistance of magnesia carbon bricks. The higher the content of Magnesium Oxide, the less the impurities, the reduction of the silicate phase, the increase of the direct binding degree of peric, the penetration of slag resistance and the improvement of the slag melting ability. The main juice in magnesia is calcium oxide, silica, and iron oxide. If the impurity content is high, especially the compound of boron oxide, it will have an adverse effect on the refractoriness and high temperature properties of magnesia. The impurities in the magnesia are mainly in a few aspects. 1 to reduce the direct binding degree of the calamite 2. Under high temperature, Magnesium Oxide forms a low melting iron oxide of 3, and the silica and other impurities are at 1500-1800 C, which precedes the reaction between Magnesium Oxide and carbon, leaving a hole to make the slag resistance of the product worse. For magnesia raw materials, besides the total amount of impurities, the type and relative content of impurities also have a significant effect on the properties of magnesia.

The price of magnesia carbon brick