Study of service conditions and nature of wear of refractories in 15-ton rotary steel-smelting furnace

Conclusions

Magnesite and periclase-spinel parts are subjected during service to the unilateral action of slag, metal and melt dust, and operate under conditions of high temperature and a variable gas medium.

The intensified wear of the lining with rammed mixture leads to the formation of a high-magnesite slag which hampers the processes of desulfurization and dephosphorization during oxygen blasting of the bath.

The layer of rammed mixture between rows 15–20 mm thick prevents the metal seeping into the second row, which makes it possible to repair the linings without replacing it.

Spent parts show clearly marked zonal structure; the working zones are strongly saturated with oxides of iron, silicon and calcium, the percentage of magnesium oxide being low.

The zones are represented by complex spinels cemented by dicalcium silicate, monticellite and glass; this leads to impairment of their flame properties.