Process and installation for prewarming and melting down metallic feed stock

摘要

In a process for prewarming and melting down metallic feed stock by means of a prewarming and melting installation having at least two electric furnaces 2, 3, the electric furnaces 2, 3 are used alternately for the melting down. To permit the electric furnaces 2, 3 to be used while at the same time minimizing the energy input and achieving short tap-to-tap times, the waste gases discharged from a first electric oven 2, 3 during the melting down of one batch by means of electrical energy in this first electric furnace 2, 3 are used for prewarming the metallic feed stock of the next batch to be charged into this electric furnace 2, 3, the melting down of the feed stock in the first electric furnace 2, 3 being followed by tapping this furnace and then charging prewarmed metallic feed stock of the next batch into this electric furnace 2, 3 and carrying out preheating by supplying energy by means of burners 7 before the beginning of the melting down to be carried out by means of electrical energy, it further being provided that the waste gases produced during preheating are used for the prewarming of metallic feed stock and, between tapping and the end of the preheating at the first electric furnace 2, 3, metallic feed stock which has been prewarmed and preheated in the mean time is in each case melted in the second electric furnace 2, 3.