Abstract: A process container comprising a metallic casing having at least one refractory cladding layer disposed on the inner side thereof, and cooling elements connected to the outer side of the casing. Each cooling element comprises a base plate and at least one cooling channel connected to the base plate in a heat-conducting manner. The base plate is connected to the outer side of the casing by being screw connected to threaded bolts welded onto the outer side of the casing whereby the base plates nestle against the casing by flexural deformation due to clamping pressure of the screw connections. Ends of the cooling channels are connected to ends of adjacent cooling channels.

Abstract: A process container comprising a metallic casing having at least one refractory cladding layer disposed on the inner side thereof, and cooling elements connected to the outer side of the casing. Each cooling element comprises a base plate and at least one cooling channel connected to the base plate in a heat-conducting manner. The base plate is connected to the outer side of the casing by being screw connected to threaded bolts welded onto the outer side of the casing whereby the base plates nestle against the casing by flexural deformation due to clamping pressure of the screw connections. Ends of the cooling channels are connected to ends of adjacent cooling channels.

Abstract: In order to avoid damage to the inner walls of the arc furnace (1) and a reduction of the electric power when material (5) to be melted has been partly burned down in an arc furnace (1), additives (10) are fed to the filling opening of a hollow electrode (7) by means of a loose-material conveyor (25) during this critical melting phase. An arc (6) between the hollow electrode (7) and a melt (4) in the arc furnace (1) is thereby shortened. A loose-material container (9) is arranged at the end of the loose-material conveyor (25) at a distance from the electrode and can easily be separated from the hollow electrode (7) in order to permit the tilting of the arc furnace (1) to empty out the melt (4). Problematic waste materials which are to be disposed of, such as for example filter dust, can be added to the additives (10).