| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the solution loss and to reduce the unit requirement of carbonaceous material by previously coating the charging carbonaceous material with a material hardly being oxidized with high-temp. CO2 and H2 O and capable of being eliminated by burning, vaporizing or melting at the lower part of a melting furnace at the time of melting scrap. SOLUTION: At the time of charging the carbonaceous material 2 into a vertical type scrap melting furnace provided with multi-step type blasting tuyeres 4-6 at the lower part of the furnace, the carbonaceous material 2 and iron source 3 are separated from each other in the cross sectional plane of the furnace. At the same time, the carbonaceous material 2 covered with one or more kinds of compounds selected from group consisting of oxides, carboxides, hydroxides and sulfides of alkali metals or alkaline-earth metals or with an ore containing these compounds on this surface is used. As the carbonaceous material to be used, lump coal or formed coal of fine coal and granular coal is used, and the surface coating material is applied spreading the slurry of the powdery and granular material thereof or by being dipped into the slurry.</p> |
