| 摘要 |
PROBLEM TO BE SOLVED: To improve thermal shock resistance and corrosion resistance and to reduce thermal conductivity by adjusting the blending ratio of raw materials and production process conditions, at the time of producing a carbon-containing refractory used as a lining material of a molten iron or molten steel reservoir. SOLUTION: In this production, first, a carbonaceous binder consisting of a combination of pitch and a phenolic resin in a ratio of 1:5 to 5:1 is added to a refractory oxide material consisting essentially of coarse grains and they are preliminary mixed together to form a preliminary mixture. Then, carbon, an oxidation inhibitor and another refractory oxide raw material consisting essentially of fine grains are further added to this preliminary mixture and they are mixed together and the resulting material is formed into a formed body and thereafter, the formed body is dried to produce the objective carbon-containing refractory. At this time, these refractory oxide raw materials used are not specifically limited and at least one material selected from among alumina, magnesia, magnesia-lime, Al2 O3 .MgO spinel, zirconia, etc., can be used as each of the refractory oxide raw materials. Also, since the optimum grain size of constituent grains of this carbon-containing refractory varies according to its constituent material quality, use, forming method, or the like, the division between 'fine' grains and 'coarse' grains of the aggregate is not definite but merely relative. |
