DC Arc furnace improved hearth construction

摘要

A DC arc furnace has an electrically conductive hearth adapted to contain a melt, and at least one arcing electrode above the hearth and adapted to form a heating arc with the melt when the hearth and electrode are supplied with DC power. The hearth has a wear lining directly contacted by the melt through which electrical conductors extend from the bottom of the wear lining to its top. Layers of electrically conductive bricks are under the wear lining and have a top layer electrically connecting with the electrical conductors, and a melt plate under the layers of the electrically conductive bricks is connected to DC power. The layers of conductive bricks have a bottom layer in electrical connection with the melt plate. The improvement comprises a layer of mixed bricks between the top and bottom layers of the electrically conductive bricks and formed by alternating electrically conductive and non-conductive bricks.