The magnesia-carbon brick of converter has high fire resistance, good thermal shock resistance, spalling resistance and slag resistance. Compared with other furnace lining materials, the service life of converter is greatly improved. The consumption process, technological process and application of magnesia-carbon brick in converter are described in this paper.

Steelmaking converter is an upright cylindrical furnace which does not need external heat source and mainly uses liquid pig iron as raw material to stop steelmaking. Its main characteristics are: by the physical heat of the liquid pig iron in the converter and pig iron components (such as carbon, manganese, silicon, phosphorus, etc.) and sent to the oxygen in the furnace to stop the heat of the chemical reaction, so that the metal reached the required composition and temperature of the steel. According to the properties of lining refractories can be divided into two kinds of acidic converter and alkaline converter; According to the position of gas blowing into the furnace, the converter is divided into bottom blowing, top blowing, side blowing and top and bottom compound blowing converter. Magnesium carbon brick has high refractoriness, good anti-slag invasion function, strong heat shock resistance and excellent shaking function at high temperature, good thermal conductivity, good wear resistance and good spalling resistance. In the electric furnace, converter and refining furnace generally lost use, service life greatly improved. At the same time, because the magnesia-carbon bricks do not need to be fired at high temperature, save power, the manufacturing process is complex, so many countries in the world quickly adopted the application. In China, magnesia-carbon brick has been developed since the beginning of 1980s. After small batch application of electric furnace and refining furnace, good application effect has been obtained. Subsequently, Anshan Iron and Steel Co., Ltd., Wuhan Iron and Steel Co., Ltd., Shougang Iron and Steel Co., Ltd., Baosteel Co., Ltd., etc., have successively tested magnesia-carbon bricks on large and medium-sized converters, and the furnace life of converters has been greatly increased. Now China has become the world's special-shaped magnesia-carbon brick consumers. As the grade of magnesia-carbon brick increases from time to time, the furnace life of converter also increases to a large extent, which lays a foundation for reducing the cost of steelmaking. The research and practice indicate that the quality of raw materials has a great influence on the application effect of magnesia-carbon brick for converter.

Therefore, it is necessary to choose all kinds of raw materials. 1.1.1 magnesia selection of magnesia carbon brick in the process of use of magnesia particles erosion process is roughly as follows: (1) magnesite particles and graphite under high temperature vacuum solid-phase reaction is as follows: MgO+C MG ↑+CO↑ generated steam and CO volatilization; (2) Magnesite particles by slag chemical melting loss, including foreign slag and all kinds of oxide in the magnesia impurities melting loss; (3) The binding strength of magnesia-carbon brick substrate decreases after oxidation and decarburization. Under the penetration and scour of slag, the magnesite particles are washed into the slag from the brick. Japanese scholars on MgO style of fused magnesia content and the relationship between the corrosion depth and the slag resistance of magnesia carbon brick and magnesite China magnesium stone grain size as the deepening of the research, the relationship between the result can clearly see that the consumption of magnesium carbon brick not only need to pay attention to the purity of magnesite, but also pay attention to and the use of large crystal fused magnesia, and hope that CaO/SiO2 2 or higher. After fully consider the factor, the use of magnesium carbon brick chose periclase crystal grain size is big, the binding force strong and less impurity, high content of magnesium in magnesite as main raw materials, the magnesite not only reduce the periclase crystal degree of silicate phase contact, adding slag corrosion rate of grain boundary, also can improve the magnesia and graphite of high temperature could be moved.