| 摘要 |
<p>PURPOSE:To shorten melting treatment time and to improve yield of molten iron by treating solid iron-contained cold material in an exclusive melting converter to make high carbon molten iron, remaining the necessary quantities of molten iron and molten slag to use the next melting and treating the remained quantity in a refining exclusive use converter. CONSTITUTION:The solid iron-contained cold material 8 of scrap, etc., lime stone 13 are charged into the exclusive melting converter 1 containing the seed molten metal 7 and the molten slag 12, and carbonic material, oxygen from tuyere 3 and oxygen from a lance 2 are supplied, and the scrap, etc., is carbonized and melted, while preventing spattering of iron dust with the molten slag 12. This operation is executed at several times and the prescribed quantity of high carbon molten iron is obtd. and then, the necessary quantity of the molten iron is left as the seed molten iron 7 and the remained part is tapped into a ladle 9 and the molten slag 12 is left in the converter 1 without any slag-off to use the next heat. The high carbon molten iron tapped in the ladle 9 is charged into the exclusive refining converter 4 and carbon dioxide gas is introduced from the tuyere 6 to stir the molten iron, and the oxygen is supplied from the top blowing lance 5 to execute decarbonization and refine into the molten steel having the necessary composition and tap off to the ladle 10.</p> |
