Clecim

Institut De Recherches De La Siderurgie Francaise (irsid)

Institut De Recherches De La Siderurgie Francaise

Clecim Sa

Institute De Recherches De La Siderurgie Francaise (irsid)

Jean-Pierre Motte

Ghislain Maurer

Pierre Vayssiere

Bernard Bahout

A direct-current arc furnace has a vessel with a floor and a cover, at least two vault electrodes projecting down into the vessel through the cover, and a hearth electrode exposed in the vessel generally in the floor below the vault electrodes. A scrap-metal charge is melted in this furnace by first energizing the vault electrodes with direct-current voltage of opposite polarity while displacing them downward through the charge from an upper position spaced relatively far from the hearth electrode to a lower position spaced relatively close to the hearth electrode and thereby passing an electric current through the charge to melt the charge and form a puddle of molten metal on the floor of the vessel at the hearth electrode. Then the hearth electrode is energized with direct-current voltage of a polarity opposite that of one of the vault electrodes and an electric current is passed through the charge between the one vault electrode and the hearth electrode to melt the charge and form a puddle at the hearth electrode at the floor of the vessel. Thereafter the vault electrodes are raised while continuing to pass an electric current partly formed as an arc between at least the one vault electrode and the hearth electrode until the entire charge is melted.

Direct-current metallurgical arc furnace and method of melting with same

An electric arc furnace comprising at least one pair of electrodes extending through the roof of the furnace for the creation of electric arcs between each of the electrodes and the charge to be melted, and a source for applying direct current to each of said pairs of electrodes, respectively of different polarities. Preferably the furnace contains also an electric probe extending through the bottom of the furnace to determine the potential of the molten charge and means for adjusting the vertical position of each electrode for maintaining the potential difference between each electrode and the molten charge at a predetermined value.

Direct-current electric-arc furnace and method of operating same

A wall element for furnaces useful in all types of metallurgical furnaces but particularly in electric arc steel refining furnaces is comprised of a metallic block defining a cooling circuit in the interior thereof and a lining of refractory bricks anchored firmly to the cooled metallic block. The metallic block carries anchoring lugs projecting from the internal face of the block, each lug consisting of a foot portion and a retaining portion, which is constituted by an enlarged end of the foot portion opposite the internal face. Each refractory brick has a face adjacent the internal face of the metallic block and defining a recessed portion of a cross section matching that of a corresponding one of the anchoring lugs.

Furnace wall element

Growing community of inventors

Metz, France

Jean-Pierre Motte