Using fused magnesia as raw material is the process basis of rebonded magnesia bricks. Therefore, rebonded magnesia bricks are also called fused magnesia bricks.

Production Process of Rebonded Magnesia Bricks

Rebonded magnesia bricks require high-pressure molding and ultra-high temperature (1800℃) firing. In order to improve the corrosion resistance of metallurgical slag, rebonded magnesia bricks can be vacuum-impregnated with asphalt after firing.

The medium-temperature asphalt used for impregnation should have a higher softening temperature (higher residual carbon content) and fewer solid particles (lower quinoline insoluble matter) to avoid clogging the pores. Before impregnation, preheat the magnesia bricks to about 200℃, put them into the impregnation tank, seal them, evacuate them, and then inject hot dehydrated liquid asphalt. Then pressurize and maintain the pressure to allow the impregnant to enter the center of the rebonded magnesia brick product.

Performance Characteristics of Rebonded Magnesia Bricks

Rebonded magnesia bricks have high density, excellent high-temperature performance, and better hydration resistance than ordinary magnesia bricks. The disadvantage of rebonded magnesia bricks is poor thermal shock resistance.

Application of Recombined Magnesia Bricks

Recombined Magnesia Bricks are often used in the tapholes of steelmaking furnaces with severe slag erosion and wear, slag lines of non-ferrous metallurgical furnaces, tapholes of mixed iron furnaces, the upper part of the lattice body of the glass kiln regenerator and the upper part of the combustion chamber.

Semi-Recombined Magnesia Bricks

The raw material cost of recombined magnesia brick is high and the price is expensive. In order to reduce the production cost, some fused magnesia is added to sintered magnesia to make bricks while meeting the use needs. The magnesia brick products produced by this process are called semi-recombined magnesia bricks. The performance and price of semi-recombined magnesia bricks are between high-purity magnesia bricks and recombined magnesia bricks.

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