A Brief Introduction of AOD Refractories

Now magnesia-chromite brick, magnesia-dolomite brick, dolomite brick are the main products used for AOD lining.

There are natural dolomite at good quality in Europe, there calcined dolomite brick to are used generally to construct AOD lining. And magnesia-dolomite brick added with zirconia is used for tuyere, calcined dolomite brick with magnesia is used for slag line. For steel-tapping spout, magnesia carbon materials and magnesia dolomo carbon brick are widely used.

The corrosion resistance ability of magnesia chrome brick is high for high alkaline slag with magnesia and low alkaline residue with chrome, it’s the best choice for furnace whose slag composite changes are big, and it is widely used in Japan and America. While because magnesia chrome brick is expensive and chrome can do damage to the environment, so such kind of refractory brick is used less and less in the recent years. Only a small amount of small converters which don’ t work continuously use magnesia chrome brick.

Compared with the past magnesia chrome brick, dolomite brick is cheaper, but its serving life is also shorter.

Nowadays because magnesia calcium brick has good high-temperature resistance, slagging resistance and thermal shock resistance, and also it can purify molten steel. So it is gradually used in jumbo furnace which works continuously, and a trend of taking place of other refractory bricks seems to happen.