| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the supplying quantity of expensive pulverized fine coal by supplying waste tire and/or waste plastics into a furnace from the upper part of a furnace opening part with spontaneous drop instead of the pulverized fine coal through a top-blown lance, to control these waste materials in the range of 20-30% effective secondary combustion ratio under condition of scarcely spending running cost without developing C dust loss, to restrain the development of iron dust to extremely low level and to obtain high yield of molten iron. SOLUTION: A melting method of iron-containing cold material is executed by using a converter having a top-blown lance 2 and nozzles 4 at the furnace bottom, supplying the iron-containing cold material into the converter, in which molten iron exists as seed metal, blowing the pulverized fine coal together with carrier gas from the furnace bottom nozzles to carburize the molten iron, and also, supplying the oxygen from the lance 2 to execute the secondary combustion of generated gas from the molten metal, and efficiently melting the iron-containing cold material to obtain molten high carbon iron 12. In such a case, the waste tire and/or waste plastics are supplied into the furnace from the upper part 6 of the furnace opening part with the spontaneous drop.</p> |
