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Keywords:

Refractories, Magnesia-chromite, MgO, ZnO-containing fayalite slag, Corrosion, Science & Technology, Technology, Materials Science, Ceramics, Materials Science, DEGRADATION, VISCOSITY, 0912 Materials Engineering, Materials, 4016 Materials engineering

Abstract:

To determine the effect of ZnO in ZnO-containing fayalite (ZFS) slags on the degradation of magnesiachromite refractories, the corrosion behaviour of a direct-bonded magnesia-chromite refractory was studiedby rotating refractoryfinger tests at 1200 ◦Cunder reducing atmosphere. In addition, MgO crucible tests at these conditions were performed to investigate in particular the effect of ZnO on the slag/MgO interaction. The dissolution of MgO from periclase into the ZFS slags is not enhanced by increasing the ZnO contentin the slags.(Fe,Mg,Zn)2SiO4 olivine and (Fe,Mg,Zn)O solid solution are the only two products in the slag/MgO interfacial reactions, even when the ZnO content in the ZFS slag reaches 16.7 wt%. The diffusion of ZnO into the chromite grains to form the (Fe,Mg,Zn)(Fe,Al,Cr)2O4 spinel was favoured with increasing the ZnO content in ZFS slags.