Destructive processes of periclase grains in fettling back walls of open-hearth furnaces

Conclusions During the first melting the working layer of the lining in the back wall is impregnated with iron oxides, calcium, silicon, etc. which leads to a reduction in the content of MgO in the working layer to 25%, and the formation of up to 40% fusible silicates in the bond. This leads to solution of the periclase grains with the formation of weak structures (an island-like character). The refractoriness of the working surface of the lining in the back wall drops to 1500–1550°. The split-up grains of periclase are easily melted and eroded by the slag and metal and pass into the slag melts.The life of the lining of the back wall increases with the use of fine-grained magnesite powder moistened by 3–4% water. With this the dust removal into the checkers of the regenerators is reduced.The following workers took part in the work. G. T. Til'k, N. I. Antropov, G. V. Chernoskutov, R. V. Krivonosova, M. A. Levanto, A. B. Dokshitskii, Yu. P. Gilev, V. G. Chekhonin, V.I. Dresvyankin.