This refractory product is made of electrofused magnesia sand, sintered magnesia sand, flake graphite, phenolic resin as the binding agent, Al, Si, SiC, B4C and other antioxidants through high-pressure molding and drying treatment. Magnesia carbon bricks has excellent thermal shock stability and low alkaline slag erosion resistance, high temperature creep and high volume stability is good wait for an advantage, can be used in low and medium carbon ferromanganese alloys and low carbon ferrochrome refining furnace, wave packet, and hot metal ladle, steelmaking converter, electric arc furnace and ladle, RH vacuum refining furnace, etc.
The good performance of magnesia carbon brick depends on the existence of carbon in brick, the oxidation of carbon in the process of its use is easy to cause the deterioration of product structure, so that slag intrude into brick along the gap, corrode magnesium oxide particles, reduce the service life of magnesia carbon brick. At present, the antioxidant properties of magnesium-carbon bricks are improved by adding antioxidants. The binders used in the production of magnesia carbon bricks are coal pitch, coal tar, special carbon resin, polyol, asphalt denaturated phenolic resin, synthetic phenolic resin, etc.
Magnesia carbon refractory brick is mainly made of fused magnesia and flake graphite, with phenolic resin as the binder, and a certain amount of antioxidants, it is made by heating, mixing, high pressure forming and heat treatment. Its properties are closely related to the graphite content in the brick. With the increase of graphite content, the strength of refractory brick decreases, the thermal expansion rate decreases, and the residual expansion rate increases.
Magnesia carbon bricks has low wettability to molten slag, and it has excellent spalling resistance and corrosion resistance, so it is suitable for slag line of ladle, especially for multi-furnace pouring. In order to meet the requirement of producing clean steel, the application of magnesium-carbon brick has expanded from the slag line to the side wall during refining in ladle. When laying magnesium carbon bricks on ladles, it should be noted that they should not be mixed with the bricks with Si02 height, otherwise the local melting loss of magnesium-carbon bricks will be increased. It is mainly used for the lining of steelmaking oxidation converter, steel outlet, hot spot of high power electric furnace wall, as well as the lining of refining furnace and slag line of steel bucket outside the furnace.
Among them, the purity of magnesia has a great influence on the slag resistance of magnesia carbon brick. The higher the content of magnesium oxide, the less impurities, the lower the degree of silicate phase segmentation, the improvement of the degree of direct binding of magnesite, slag penetration and slag melting capacity. There are mainly calcium oxide, silicon dioxide and iron oxide in magnesia. If the impurity content is high, especially the compound of boron oxide, the refractoriness and high temperature performance of magnesia will be adversely affected. For magnesia raw materials, in addition to the total amount of impurities, the type and relative content of impurities also have a significant impact on the properties of magnesia.
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