Magnesia carbon brick is widely used as converter lining brick because of its excellent slag erosion resistance, thermal shock resistance, spalling resistance, wear resistance and high temperature stability. Because MgO-C brick is easy to oxidize, thermal shock resistance, deterioration, so researchers have carried out extensive exploration and research.

Its key technology hotspots are as follows:

1) Application of new composite antioxidants with antioxidant capacity and self-healing: Al, Si powder or Al-Si composite powder are used as antioxidants of magnesia carbon brick. After heat treatment or high temperature service, high corrosion resistance phases such as SiC and AlN can be formed in situ, which significantly improves the performance of low carbon magnesia carbon brick materials.

2) Preparation and application of low-dimensional graphitized carbon: the addition and application of various pre-synthesized nano carbon, such as nano carbon black, nano graphite and oxide composite powder; In situ synthesis of low dimensional graphitized carbon, transition elements (Fe, Co, Ni) inorganic or organic compounds as catalysts, transition metal catalyzed phenolic resin cracking CO, C2H2, CH4 gas, carbon nanotubes, carbon nanotubes and other low dimensional graphitized carbon. Through the development and application of these new technologies, magnesium-carbon bricks maintain good corrosion resistance and thermal shock resistance.

The properties of magnesia carbon bricks used in different parts of the converter are different. In order to meet the requirements, meet the performance requirements of different parts of the MgO-C brick. Their basic characteristics and typical characteristics. The microstructure analysis of magnesium-carbon brick after use shows that the damage of magnesium-carbon brick is mainly embodied in slag erosion. By investigating the damage factors of magnesium-carbon bricks, Japanese researchers found that limiting the diffusion rate of magnesium (g) in magnesium-carbon bricks at high temperature can reduce the damage rate of bricks. The slag erosion resistance test results show that with the increase of the apparent porosity of magnesium-carbon brick (1500 heat treatment), the erosion index of the brick is linear. On this basis, MgO-C brick with dense structure was prepared by adjusting the grain size distribution of raw materials and the production technology of antioxidant additives.

The service life of magnesia carbon brick is often affected by carbon oxide, thermal shock spalling and wear of molten steel. Therefore, it is an inevitable trend to develop low carbon magnesium-carbon brick with good wear resistance and thermal shock resistance. The researchers of TISCO's second steelmaking plant used m(CaO):m(SiO2)2 fused magnesia and high purity flake graphite (C mass fraction 98%) as the main raw materials, Al0x 1775mg-Al0x 1775 Si0x 1775 B4C0x 1775 CAB6 as the antioxidant, Using thermosetting phenolic resin as binder, high quality and low carbon MgO-C brick was prepared. Using the newly developed low carbon magnesium-carbon brick in steelmaking converter, the service life of a furnace is stable at 500~700 years