| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for operating an arc-furnace by which electric power consumption can be reduced and operational time can be shortened by efficiently melting cold-iron source in the case of producing molten metal by using the cold-iron source. SOLUTION: In the method for operating the arc-furnace, the arc-furnace 1, which comprises a melting chamber 2 and a shaft-type pre-heating chamber 3 directly connected to the upper part of the melting chamber 2, and pre-heats the cold-iron source 15 in the pre-heating chamber 3 by introducing waste gas generated in the melting chamber 2 into the pre-heating chamber 3, is used. When the cold-iron source 15 is melted by being heated with the arc in the melting chamber 2 while supplying the cold-iron source 15 into the pre-heating chamber 3 so that the cold-iron source 15 holds the existing state in the pre-heating chamber 3 and the melting chamber 2, carbon-concentration of the molten iron tapped off from the arc-furnace 1, is defined as≥1 mass%. It is desirable that carbonaceous material is added in the melting chamber 2 and, the carbonaceous material to be added into the melting chamber 2 is derived from biomass. COPYRIGHT: (C)2011,JPO&INPIT |
