Abstract: In this paper, the raw material formula of magnesia spinel non-fired brick is improved, and its physical and chemical indexes are determined. By analyzing the erosion of residual brick of RH furnace by SEM, it is found that the magnesia spinel non-fired brick has achieved good results in RH furnace trough, circulation pipe and RH snorkel, and its service life has exceeded that of magnesia chrome brick in smelting some steel grades. With the continuous optimization of magnesia spinel non-fired brick scheme and the scarcity of chromium ore in the domestic environment, the available magnesium spinel non-fired brick gradually replaces magnesia-chromium brick.

Key words: RH furnace, Magnesia spinel non-fired bricks, RH snorkel, Erosion, Service life