| 简介 |
PROBLEM TO BE SOLVED : To obtain a basic refractory having improved tolerance without including Cr2O3 by adding a small amount of an oxide of a rare-earth metal to a basic refractory raw material. SOLUTION : A basic refractory raw material having especially >=95 wt.% MgO content is preferable with respect to corrosion resistance to slag. A magnesia clinker partially or wholly substituted with a magnesia-calcia clinker can be used as a basic refractory raw material comprising MgO and CaO as main components. The refractory has a texture in which an oxide of rare-earth metal exists mainly in the matrix of brick. Consequently the oxide of rare-earth metal is reacted with SiO2 in a slag to raise the melting point of the slag and to control permeation of slag. Y2O3, La2O3, etc., are used as the oxide of the rare- earth metal and its blending ratio is properly about 0.2-20 wt.%. In the case of the oxide of the rare-earth metal comprising >=50 wt.% Y2O3, the basic refractory shows especially excellent corrosion resistance and hot strength. |
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