Magnesia-chrome brick is mainly used for copper smelting furnaces among nonferrous metals. Brick damage is caused by structural spalling, penetration of copper and slag in addition to slag erosion. We have developed fine texture and low permeability magnesia-chrome bricks to prevent penetration, and they are being used at many plants at present. In aluminum furnaces, refractories such as high alumina bricks, castables and plastics are used. The refining temperature is low and slag erosion is little, however, metal penetrates into the bricks and the brick quality deteriorates. Therefore, bricks or castables with reduced metal reaction properties and good separating properties owing to the use of additives are used.
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