| 摘要 |
PROBLEM TO BE SOLVED: To cool graphite electrodes without generating hydrogen gas through water gas reactions inside an electric-arc furnace, decreasing the longevity of even such a furnace lid as is made from an inexpensive refractory material such as chamotte, and contracting it by reducing original electrode units through the minimizing of the oxidation wear of the graphite electrodes during melting and smelting. SOLUTION: A metal is arc melted and smelted in an electric steelmaking furnace by passing current to a line of graphite electrodes which comprises graphite electrodes 1 connected to one another via nipples. In this case, above the furnace lid 4 of the electric steelmaking furnace, the line of graphite electrodes is cooled by spraying of a coolant 2 while the coolant 2, ejected toward the outer peripheries 1a of the line of graphite electrodes, is inclined upwards by an upward inclination angleθof more than 35 deg. but not more than 60' to a horizontal level.
|
