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Characteristics of Magnesium Carbon Bricks at Converter Tapping

2025-08-29

Production Process Requirements for Magnesia-Carbon Bricks

Magnesia-carbon bricks are composite refractory materials made from high melting point alkaline oxide magnesia (melting point 2800℃) and high melting point carbon materials that are difficult to be wetted by slag, with various non-oxide additives added. They are bonded with carbonaceous binders to form non-burning carbon composite refractory materials. What are the requirements for raw materials, binders, and additives during the production of magnesia-carbon bricks?

Raw Material Requirements
(1) Magnesia Sand: MgO content ≥ 95%, particle bulk density ≥ 3.5g/cm³, CaO·SiO₂ ≥ 2, Fe₂O₃ < 1, porosity ≤ 3%, large crystalline particles with high purity.

(2) Graphite: Fixed carbon content ≥ 94%, low SiO₂ and Al₂O₃ in ash, typically added at 15%~20%, with the amount varying depending on the application area.

(3) Additives: Different additives are selected based on the application area. Generally, Al and Si are added. The amount should be appropriate. The particle size of additives is generally less than 0.15mm.

(4) Binder: Should have good wettability with magnesia sand and graphite, requiring only a small amount to form good mud with good viscosity; minimal chemical reaction with aggregates; minimal changes in the mixed mud over time; sufficient fixed carbon content; free of harmful components to humans; and an appropriate amount added.

Characteristics of Magnesia-Carbon Bricks at Converter Taphole

The temperature at the converter taphole changes drastically and suffers severe slag corrosion. Magnesia-carbon bricks used here should have good thermal shock resistance, strong slag resistance, and be able to withstand erosion from high-temperature molten slag and hot waste gases. They should also be easy to clean from steel buildup.

It has excellent slag resistance, slag penetration, thermal shock stability and thermal conductivity.

Technical Parameters