Abstract: A metallurgical lance for injecting a material into molten metal is provided. The lance has a outer conduit with first and second ends, and a material carrier inner conduit for carrying the material to be injected into the molten metal. The inner conduit has a supply end and an injection end and is in part disposed within and throughout the outer conduit. A high temperature heat insulator is disposed around the outer conduit and extends along the outer conduit from at least an intermediate portion thereof to at least the first end thereof whereby all portions of the lance to be disposed in the molten metal are protected by the insulator. A first end closure and a second end closure for the outer conduit have centrally located apertures therein for receiving a portion of the inner conduit.

Abstract: A remote control gunning apparatus for repairing the refractory lining of a metallurgical vessel in the vertical position at elevated temperature including a water-jacketed television camera for televising the interior of the vessel to detect the eroded areas and monitor the repair thereof, the camera jacket being provided with a transparent heat-resistant port in the line of sight of the lens of the camera, an electrical conduit for supplying power to the camera and for transmitting a televised signal from the camera to a monitor outside the vessel, an air conduit for supplying pressurized air to cool and clean the port, and cooling water conduits concentric with and jacketing the electrical conduit and a substantial portion of the air conduit and connected with the camera jacket.