| 摘要 |
<p>PURPOSE:To obtain a steel manufacturing stock material generating no bumping in charging the same into a molten metal, by forming a mixture obtained by mixing a phenolic resin type binder and heavy oil with a pulverized minute metal into a lumpy form by compression molding. CONSTITUTION:0.5-1.0wt% of a phenolic resin type binder is added to a pulverized minute metal recovered from a metal trash or steel manufacturing slag. In this case, 0.2-0.5wt% of heavy oil or kerosene is further added. After these components are mixed under stirring, the resulting mixture is put in a mold frame and subjected to compression molding. By this method, the minute metal can be easily formed into a lumpy form. This lumpy substance has such a structure that the voids between metal minute particles are filled with the binder and the surface thereof is perfectly coated with said binder. Therefore, bumping is not generated even if said lumpy substance is charged into a molten metal. In addition, because of high burst strength and falling strength, said lumpy substance is sufficiently reacted with the molten metal in charging.</p> |
