Magnesia carbon bricks (Mgo-c brick) for converter (BOF)

Introduction

  Converter magnesia carbon bricks refer to magnesia carbon refractory products used as converter linings made of magnesia sand and graphite as the main raw materials.

performance

  Converter magnesia carbon bricks have the characteristics of high temperature resistance, strong slag resistance, good thermal shock resistance, high high temperature strength, etc. However, its disadvantage is that it is easy to oxidize during use, which can be improved by adding antioxidants.

Production Process

  The main raw materials are fused magnesia or high-purity sintered magnesia and high-purity graphite. Generally, the MgO content in magnesia is required to be greater than or equal to 95%, and the C content in graphite is required to be greater than or equal to 94%. Phenolic resin or asphalt is used as a binder, and appropriate additives are selected according to the use conditions. After batching, mixing, molding, and heat treatment, the finished product is made.

On-site use

  During the smelting process, the use conditions and damage conditions of various parts of the converter are different. In order to achieve balanced erosion, the brand and quality of the magnesia carbon bricks selected for different parts of the converter under different use conditions are also different.
The temperature of the furnace mouth and furnace cap changes dramatically, and the slag corrosion is more serious. Magnesium carbon bricks with good thermal shock resistance and strong slag resistance should be selected. In addition to the damage caused by blowing, there is no protective slag layer cover on both sides of the ear shaft, which is not easy to repair and the carbon in the brick is easily oxidized. High-quality magnesia carbon bricks with excellent slag resistance and good oxidation resistance should be built. The slag line is in contact with the slag for a long time and is seriously corroded by slag. Magnesium carbon bricks with excellent slag resistance need to be built. When oxygen is blown on the charging side, the splashing of slag and molten steel can easily cause chemical erosion, wear, scouring and direct impact and erosion of scrap steel and molten iron on the charging side. Magnesium carbon bricks with strong slag resistance, high temperature strength and good thermal shock resistance should be selected. Compared with other parts, the furnace hearth and furnace bottom are less corroded, so ordinary magnesia carbon bricks can be used. When the top and bottom composite blowing technology is adopted, especially when CO2, O2 and other gases are blown at the bottom, the damage is more serious. High-grade magnesia carbon bricks with good oxidation resistance, good thermal shock resistance, high high temperature strength and strong slag resistance should be selected. According to the different parts of the converter, the selection of magnesia carbon bricks with corresponding performance is an effective way to improve the technical and economic indicators of the converter.

Real video of magnesia carbon bricks for converter

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