| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the corrosion resistance of magnesia-spinel brick with rare earth oxide as refractories freed of chromium added when it is applied to the lining of a kiln for metal refining such as a steel secondary refining furnace. <P>SOLUTION: In the magnesia-spinel brick with rare earth oxide added, Al<SB>2</SB>O<SB>3</SB>is not contained in a matrix, or the content thereof is prescribed to ≤2 mass%. The magnesia-spinel brick with rare earth oxide added has a raw material composition consisting of a magnesia clinker, a rare earth oxide raw material, and a spinel clinker, and, as for the grain size composition of the spinel clinker used as the raw material, the ratio of the ones with a grain size of ≥1 mm is 3 to 30 mass%, and the ratio of the ones with a grain size of <1 mm is <3 mass%. <P>COPYRIGHT: (C)2003,JPO |
