Abstract: A process is provided for recovering metals from metal-containing slags such as iron-copper slags from copper smelting furnaces and iron-nickel slags produced in smelting nickel-bearing ores. The molten slag is fed to an electric-arc furnace wherein a molten metal bath is formed. A carbon injection unit, including an injector tube which is inserted into the furnace, is used to inject carbon into the bottom of the molten metal bath. A flux, such as CaO, is also fed, as needed, to the bath. After reduction, the metal product is tapped from the furnace.