A metal scrap submergence device comprising an open top chamber including walls of a heat resistant material, an inlet positioned in the chamber, an outlet positioned in the base of the chamber, and a ramp adjacent the side wall of the chamber. The device further including a removable vane, an inwardly or outwardly sloped ramp surface, and/or diverter.

A metal scrap submergence device comprising an open top chamber including walls of a heat resistant material, an inlet positioned in the chamber, an outlet positioned in the base of the chamber, and a ramp adjacent the side wall of the chamber. The device further including a removable vane, an inwardly or outwardly sloped ramp surface, and/or diverter.

An outer lid for an arc furnace includes an outer lid formed from copper or a copper alloy. The outer lid also includes electrode ports, an off-gas chute, and a charge chute. Cooling circuits are present within the outer lid. The bottom surface of the outer lid is exposed to the internal volume of a crucible, and promotes accretion of slag, which can act as a heat barrier.

An outer lid for an arc furnace includes an outer lid formed from copper or a copper alloy. The outer lid also includes electrode ports, an off-gas chute, and a charge chute. Cooling circuits are present within the outer lid. The bottom surface of the outer lid is exposed to the internal volume of a crucible, and promotes accretion of slag, which can act as a heat barrier.

The present invention relates to an over fire air arrangement for a furnace (1), the furnace (1) having opposing first wall (4) and second wall (6) and opposing first side wall (5) and second side wall (7) between the first and second walls (4, 6) for forming a furnace enclosure (2). The over fire air arrangement comprising at least one first over fire air port (20) provided to the first wall (4) for supplying a first over fire air flow (40) into the furnace (1) and at least one first additional over fire air port (50) provided to at least one of the first and second side walls (5, 7) in the vicinity of the first wall (4), the at least one first additional over fire air port (50) being arranged to supplying a first additional over fire air flow (60) into the furnace (1) transversely to the first over fire air flow (40).

A shield for injection lances in metal production furnaces facilitates the adjustment of the contents of the melt in the metal production furnace. The shield has an outer shell joined to an inner shell by a face plate. The outer shell and inner shell define a fluid chamber between them and the face plate has an inlet aperture and an exit aperture for coolant flow through the fluid chamber. The shield is sized and shaped to fit into or around an aperture in the wall of the furnace. The shield has apertures through it to facilitate introduction of additives to the melt in the metal production furnace.

The present invention provides an electric furnace including: a furnace body; and a plurality of electrodes that are provided so as to hang down into the interior of the furnace body from a top section thereof. The raw material is heated and melted in the furnace body by energizing the electrodes and a molten material consisting of a slag and a metal is generated. The electric furnace is configured so that the overall heat transfer coefficient of a side wall of the furnace body is lower than the overall heat transfer coefficient of a side wall of the furnace body, the side wall coming into contact with a layer of the metal formed in a bottom layer, the side wall coming into contact with a layer of the slag formed in a top layer, and said layers being formed in the molten material due to gravity separation.

A rotary hearth furnace includes a unit that supplies an agglomerate onto a hearth of the rotary hearth furnace, a unit that discharges a heated substance which has been heated in the rotary hearth furnace to the outside of the furnace, and a unit that discharges an exhaust gas in the rotary hearth furnace to the outside of the furnace. The rotary hearth furnace has a heating section and a non-heating section. The unit that discharges an exhaust gas to the outside of the furnace is provided in the non-heating section. A unit that takes an outside air into the furnace is provided in the non-heating section and on an upstream side in a flow direction of the exhaust gas from the unit that discharges exhaust gas to the outside of the furnace.

A rotary hearth furnace includes a unit that supplies an agglomerate onto a hearth of the rotary hearth furnace, a unit that discharges a heated substance which has been heated in the rotary hearth furnace to the outside of the furnace, and a unit that discharges an exhaust gas in the rotary hearth furnace to the outside of the furnace. The rotary hearth furnace has a heating section and a non-heating section. The unit that discharges an exhaust gas to the outside of the furnace is provided in the non-heating section. A unit that takes an outside air into the furnace is provided in the non-heating section and on an upstream side in a flow direction of the exhaust gas from the unit that discharges exhaust gas to the outside of the furnace.

Disclosed herein is a roof for an electric furnace. The roof includes: a small-ceiling seating port (120) which has a small-ceiling seating surface (122) and a small-ceiling support surface (124) that extends from the small-ceiling seating surface inwards and downwards; and a large ceiling (130) which has an upper roof panel (132) that radially extends from the small-ceiling seating port at a downward inclination angle, a lower roof panel (134) disposed below the upper roof panel at a position spaced apart from the upper roof panel, and a side roof panel (136) connected to the upper roof panel and the lower roof panel. The upper roof panel is connected to the outer circumferential surface of the small-ceiling seating port, and the lower roof panel is connected to a lower end of the small-ceiling support surface so that the inclination angle of the lower roof panel can be increased.