| 摘要 |
PROBLEM TO BE SOLVED: To provide carbon-contg. basic refractories improved in wear resistance, spalling resistance and hot strength without impairing the corrosion resistance and oxidation resistance thereof and to obtain a melting and refining vessel for molten metal having high durability and long life by lining part or the whole of the heavily wearing section of the melting and refining vessel with these refractories. SOLUTION: An SiC raw material of which the max. grain size [X] (μ) and amt. of addition [Y] (wt.%) in outer per cent satisfy the equation [Y]<=3log[X] is added to 100wt.% compounded compsn. composed of 70 to 94wt.% MgO-based refractory raw material, 5 to 25wt.% C-based refractory material and 1 to 5wt.% Ca-contg. metal. The SiC raw material of a grain size of 0.1 to 0.5mm is otherwise added at <=8wt.% or the SiC raw material having a grain size of 0.5 to 1.0mm is added at <=9wt.% thereto. The mixture is thereafter kneaded and molded by using a binder and is then dried, by which the carbon-contg. basic refractories are obtd. Part or the whole in the furnace is lined with such refractories, by which the melting and refining vessel for molten metal having the high durability and long life is obtd. |
