Do you know Magnesia-Carbon Brick?

May. 13, 2020

As an Alumina Magnesia Carbon Brick Manufacturer, share with you.

Magnesia-Carbon Brick uses high melting point basic oxide magnesium oxide (melting point 2800°C) and high melting point carbon material that is difficult to be infiltrated by slag as raw materials, adding various non-oxide additives. Non-burning carbon composite refractory material combined with carbon binder.

Magnesia-Carbon Brick

Magnesia-Carbon Brick

Effect

Magnesia carbon bricks are made of high melting point basic oxide magnesium oxide (melting point 2800°C) and high melting point carbon materials that are difficult to be infiltrated by slag as raw materials, adding various non-oxide additives. Non-burning carbon composite refractories combined with carbon binder. Magnesia carbon bricks are mainly used in the lining of converter, AC arc furnace, DC arc furnace, slag line of ladle and other parts.

As a composite refractory material, magnesia-carbon brick effectively utilizes magnesia's strong resistance to slag erosion, carbon's high thermal conductivity and low expansion, and compensates for the biggest shortcomings of poor resistance to magnesia.

The main features are: good high temperature resistance, strong slag resistance, good thermal shock resistance, and low high temperature creep.

The traditional magnesia-carbon bricks made with a synthetic tar binder according to the cold mixing process harden and acquire the necessary strength during the tar damage process, thus forming isotropic glassy carbon. This kind of carbon does not show thermoplasticity, which can relieve a large amount of stress in a timely manner during baking or operation of the lining. The magnesia-carbon brick produced with the asphalt binder has a high temperature plasticity due to the formation of an anisotropic graphitized coke structure during the asphalt carbonization process.

production process

raw material

The main raw materials of MgO-C bricks include fused magnesia or sintered magnesia, flake graphite, organic binders and antioxidants.

Magnesia

Magnesia is the main raw material for the production of MgO-C bricks, which are divided into fused magnesia and sintered magnesia. Compared with sintered magnesia, fused magnesia has the advantages of large diasporite crystal grains and large particle volume density. It is the main raw material used in the production of magnesite bricks. The production of ordinary magnesia refractories requires magnesia raw materials to have high-temperature strength and erosion resistance. Therefore, the purity of magnesia and the C/S ratio and B2O3 content in the chemical composition are emphasized. With the development of the metallurgical industry, the smelting conditions are becoming more and more severe. The magnesia used for MgO-C bricks applied in metallurgical equipment (converter, electric furnace, ladle, etc.), in addition to the chemical composition, in terms of organizational structure, high density and Big crystal.

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