Abstract
A chemical and petrographical investigation of magnesite-chromite refractory after prolonged service in the roof of an open-hearth furnace established the presence in the working zone of direct periclase-periclase and periclase-chromespinellide bonds of the crystals. The main factors facilitating the development of a direct bond in the working zone are migration of silicate melts from this zone into the deeper sections of the refractory under the temperature gradient conditions and saturation of the working zone by iron oxides.
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