| Abstrakt: |
In the intermediate ladle, wear of the high-alumina rammed lining occurs mainly as a result of the penetration into it from the working side of iron-manganese melt, its oxidation, a substantial reduction in the refractoriness of the working zone, and its fusion and erosion by metal. A particularly large quantity of ferrous oxide and manganous oxide is present in the film covering the working surface of the lining, as a result of which it possesses a low refractoriness and viscosity, and is easily removed by the metal. This is confirmed by its small thickness (0.2-0.3 mm). The high resistance of the high-alumina rammed body is explained by the high concentration in the bond, which is the least abrasion resistant part of the refractory, of finely ground corundum, which together with the silica of the clay constituent forms coarse needles of mullite and also prisms of corundum during service. The slow decomposition of the mullite under the action of the melt and the presence of corundum prisms increases the viscosity of the resulting melts in contact with the refractory, which appreciably retards the wearing away of the refractory. [ABSTRACT FROM AUTHOR] |
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