| 摘要 |
<p>PURPOSE: To enable use of powdery iron scrap and to produce molten pig iron excellent in the quality in good electric power efficiency by piling lumpy cokes as heating medium at the bottom part and using a cylindrical type melting furnace having a high-frequency boil for controllable induction heating at the outer side. CONSTITUTION: A molten iron tapping hole 5 is arranged at the bottom part 13 of the refractory-made cylindrical type melting furnace 12, and the coil 3 for high-frequency induction heating connected with a high-frequency power source 9 and a power control unit 110 is arranged at the outer periphery of the furnace. The lumpy cokes 1 as the heating medium are piled at the furnace bottom part and the electricity is conducted to the coil 3 for heating to induction-heat the cokes 1. The iron sources 2 mixed with fine size of turning iron waste, etc., are charged on the heated cokes 1, heated, melted and sufficiently reduced by flowing down while passing through between the cokes 1 to make the good quality pig iron having extremely little oxide content. In this case, the temp. of molten iron discharged from the iron tapping hole 5 is adjusted to a prescribed temp. by controlling the high-frequency power supplied into the coil 3 to the constant with the power control unit 110.</p> |
