| 简介 |
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. SOLUTION : In the magnesia-spinel brick with rare earth oxide added, Al2O3is 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 COPYRIGHT : (C)2003, JPO |
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