The effect of temperature variations and iron oxides on the destruction of magnesite chromite roofs

Abstract

Since the original dynamic thrust “force” in the magnesite-chromite brick is the temperature variation in the furnace, it is necessary to attempt to create units with stable heat cycles; this can be done by automating the thermal cycle, increasing the specific volume of the working region of the furnaces to reduce the effect of introducing cold materials on the temperature changes. A magnesite-chromite roof is a mobile system; to eliminate the subsequent dynamic loading it is desirable to construct the thrust arch with elastic suspensions (Fig. 13). The suspended tie with preloaded springs is an elastic suspension (shock absorber) the purpose of which is to remove the dynamic loads developed during movement of the roof [5]. When a new roof is being built it is necessary to provide temperature gaps between the bricks, which during heating will close, forming a dense roof with uniform distribution of thrust load over the whole surface of the brick in the arch.