Magnesia carbon brick

Magnesia carbon brick is a high melting point basic oxide magnesium oxide (melting point 2800 ° C) and a high melting point carbon material which is difficult to be infiltrated by slag as a raw material, and various non-oxide additives are added. A non-burning carbon composite refractory material formed by a combination of carbonaceous binders. Magnesia carbon brick is mainly used for the lining of converter, AC arc furnace, DC arc furnace, slag line of ladle and so on.

As a composite refractory material, magnesia carbon brick effectively utilizes the strong slag corrosion resistance of magnesia and the high thermal conductivity and low expansion of carbon, which compensates for the shortcomings of poor resistance to spalling of magnesia. Its main features are: good high temperature resistance, strong slag resistance, good thermal shock resistance and low temperature creep.

The refractory material used in the early ladle slag line is directly combined with magnesia chrome brick, fused and then combined with high-quality alkaline brick such as magnesia chrome brick. After the MgO-C brick was successfully used on the converter, the MgO-C brick was also used in the refining ladle slag line, and good results were obtained. At present, China and Japan generally use resin-bonded MgO-C bricks with a carbon content of 12% to 20%. In Europe, asphalt-bonded MgO-C bricks are used, and the carbon content is generally about 10%. .

Since the use of MgO-C bricks instead of magnesia-chrome bricks in China's refined ladle slag line bricks, the comprehensive use effect is obvious. The 300t ladle slag line of Baosteel Co., Ltd. began to use MT−14A magnesia carbon brick in July 1989, and the slag line life was maintained at more than 100 times; the 150T electric furnace ladle slag line used low carbon magnesia carbon brick to smelt cord steel, tapping temperature 1600 ° C ~ 1670 ° C, achieved significant results.