| 摘要 |
Fused cast refractories are obtained from a batch containing by weight 40-78% MgO, 4-58% Cr2O3, up to 33% Al2O3, up to 14.5% FeO, up to 4.5% SiO2, up to 10% CaO the total of these oxides being at least 87%, which is melted and cast and has incorporated therein by addition to the batch or melt 0.03-7% by weight of fluorine. The fluorine is added in combined form e.g. cryolite and the fluorides of sodium, aluminium, calcium, magnesium, barium and strontium. Specifications 265,847 and 724,980 are referred to. |
