FUSED MAGNESIA REFRACTORIES WITH INCREASED THERMAL STABILITY

Abstract

The influence of various additions to magnesia refractories is investigated in the article to increase the thermal stability and to decrease the costs for high-refractory bricks production. In accordance with the results the efforts have been undertaking to raise the refractories' thermal stability by means of Cr₂O₃ additions. The ferrochrome, however, which forms in course steel melting reduces the operating refractory temperature. The optimal addition was found to be 5-15 % of raw magnesia MgCO₃. The refractories with elevated thermal stability can be used effectively in the linings of high-temperature ferrous and non-ferrous industry vessels such as liquid furnaces, oxygen-flash smelting furnaces for lead-zinc concentrates, horizontal converters, electrical furnaces for ferrous industry. Ref. 3. Tab. 2.