Hello, welcome to the official website of Liaoning Hongyu Refractories Group Co., Ltd.
Liaoning Hongyu refractory Group Co., Ltd.
Address: two room village, Guan Tun Town, Dashiqiao, Liaoning, China
Web site: www.hy-ref.com
Contact: high general
Zip code: 115100
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 listed on 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.
Its main characteristics are as follows: 1. It has good high temperature resistance, 2 slag resistance, 3 thermal shock resistance and 4 high temperature creep.
The effect of raw materials on the properties of magnesia carbon brick
The quality of magnesia has a very important influence on the properties of magnesia carbon brick, and how to select magnesia is the key to producing 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 used in the production of magnesia carbon brick, the following contents should be examined: 1. Magnesium Oxide content (purity). 2. kinds of impurities, especially the content of.C/S and B2O3. 3. magnesia density, pore size and stomatal morphology (sinterability).
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 impurities in magnesia are mainly 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 magnesia are mainly adverse effects of a few aspects 1 reducing the direct binding degree of paramite 2 at high temperature and the formation of low melting iron oxide with Magnesium Oxide at high temperature, and the reaction of silica and other impurities at 1500-1800 C before the reaction of Magnesium Oxide with carbon, leaving pores to make the slag resistance of the products 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. Among them, the effect of CaO/SiO2 ratio and B2O3 content is the most obvious. Generally, magnesia refractories usually require CaO/SiO2 equal to 2 to improve the high temperature stability of MgO C bricks.
The carbon materials used to prepare magnesia carbon bricks are mainly flake graphite.