Studies on Refractory from Open-Hearth Furnace, III

Abstract

On the basis of a Chrome-magnesite brick removed from the front wall of a 40-ton basic open-hearth furnace after 114 heat services, studies on the process of slagging reaction against the refractory have been carried out, with the aids of petrological microscope, integration-stage and chemical analysis. Mineralogical compositions of the reacted brick were deduced from the results of its chemical analysis. The results obtained may be enumerated as follows:(1) A large amounts of iron oxide and lime were permeated into the hot working face of the brick from the furnace atmosphere during the operation.(2) The permeated iron oxide was fixed as solid solution with chrome spinet in the brick.(3) The permeated lime caused to form monoclinic pyroxene, after reacting with the matrix in the hot face.(4) The original low fusible silicate in the hot face migrated into the intermediate part behind the hot face, resulting in the formation of the second zone enriched in lime, magnesia and silica.(5) In the intermediate zone, about a half of the free magnesia was fixed into the spinel solid solution, while the remainder was distributed throughout the matrix as periclase.