Magnesia carbon brick is made of magnesia, heavy burned magnesia, fused magnesia, high purity magnesia and high quality graphite and bauxite additives. The price of magnesia carbon brick has a great relationship with the graphite content in the brick. With the increase of graphite content, the strength of brick decreases, the thermal expansion decreases, and the residual expansion rate increases.

Therefore, the graphite content in the brick should be controlled at about 20%. Magnesia carbon brick has little wettability to slag, excellent spalling resistance and erosion resistance, and is suitable for slag line parts of ladle, especially for multi-furnace continuous pouring. In order to meet the need of producing clean steel, the application part of magnesia-carbon brick has been expanded from the slag line to the side wall during the refining of ladle.

When laying magnesia-carbon bricks on ladle, care should be taken not to mix with bricks containing high Si02. Otherwise, the local melting loss of magnesia-carbon brick will be increased, and the melting loss mechanism is as follows.

It is mainly used for lining, steel outlet of steelmaking oxidation conversion furnace, hot spot of furnace wall of high-power electric furnace, refining lining outside the furnace, slag line of steel drum, etc. In the smelting process, the use conditions and damage conditions of each part are different. In order to achieve balanced corrosion loss, the grades and quality of magnesia carbon bricks selected for different parts of the converter are also different.

The temperature change of the furnace mouth and the furnace cap is severe, and the slag corrosion is more serious. Magnesia carbon brick with good thermal shock resistance and strong slag resistance should be selected. The two sides of the trunnion are damaged by blowing, and the surface is not covered with protective slag layer, which is not easy to repair and the carbon in the brick is easy to oxidize. High quality magnesia carbon bricks with good slag resistance and oxidation resistance should be laid. The slag line is in contact with the slag for a long time, and the slag corrosion is serious. Magnesia carbon bricks with excellent slag resistance should be laid. The splashing action of slag and molten steel during oxygen blowing on the charging side is easy to cause chemical erosion, wear and erosion, as well as direct impact and erosion of scrap steel and molten iron. Magnesia carbon brick with strong slag resistance, high temperature strength and good thermal shock resistance should be selected. Compared with other parts, the erosion of the furnace cylinder and the furnace bottom is light, and ordinary magnesia-carbon bricks can be used. When the top and bottom composite blowing technology is used, especially when the bottom blowing CO2, O2 and other gases, the damage is more serious. Advanced magnesia carbon brick with good oxidation resistance, good thermal shock resistance, high temperature strength and strong slag resistance should be selected. Because of the different parts used in the converter, selecting magnesia carbon brick with corresponding properties is an effective way to improve the technical and economic index of the converter.

The raw material for the preparation of magnesia carbon bricks is fused magnesia with 98% MgO content. Magnesia carbon bricks have the characteristics of low porosity, slag resistance, thermal shock resistance and high high temperature strength. They are mainly used in basic oxygen furnaces, medium grade magnesia, ladle slag lines and arc hot spots. Magnesia carbon brick is a kind of high quality refractory material. Their main components are magnesium oxide and carbon, with a magnesium oxide content of 60-90% and a carbon content of 10-40%. This material is made from high purity magnesium oxide particles, carbon material, tar, asphalt or resin baked at high temperatures. These magnesia refractory bricks have the characteristics of slag corrosion resistance, heat shock resistance, thermal conductivity and so on.

Magnesia carbon brick is an unburned carbon composite refractory material, which is made of magnesium oxide with a high melting point (2800 ° C) of basic oxide and a high melting point of carbon material, which is difficult to be eroded by slag, and a variety of non-oxidizing additives and carbon adhesives are added.

The magnesia contained in magnesia carbon bricks is determined according to what material is used, and the main common magnesia carbon bricks are 72% magnesium oxide, 74% magnesium oxide, 76% magnesium oxide, 80% magnesium oxide, 82% magnesium oxide, 85% magnesium oxide, ladle magnesia carbon bricks, The main raw materials used in the production of magnesia carbon bricks are fused magnesia, graphite, metal aluminum, metal silica powder (click the link for product information), liquid phenolic trees are stirred by the sand mixer and pressed by the press. Magnesia carbon bricks are used in the refining of ladle slag line. Magnesia carbon bricks are also used in AC electric arc furnace, DC electric arc furnace, converter and other lining parts.