Patent ID: 7597736

Claim:
A process for treating slag consisting of steelwork slag from a steelwork converter, wherein the steelwork slag contains oxidic iron particles, the process comprising: charging the steelwork slag into a reactor vessel onto a residual iron melt containing dissolved carbon, the charging being conducted slowly and continuously over an extended period of time; electrically heating contents of the reactor vessel over an extended period of time; injecting a carbon-containing reducing agent with gas by means of a lance over an extended period of time into a region close to a boundary surface between the slag and the iron melt or directly into the iron melt so that carbon of the reducing agent is dissolved in the iron melt and the iron melt and the slag are mixed, the dissolving of the carbon of the reducing agent in the iron melt occurring over an extended period of time; reducing oxidic iron particles of the slag thereby forming metallic iron and CO over an extended period of time; forming a foamed slag by the resulting CO over an extended period of time, introducing an oxygen-containing gas into the foamed slag and post-combusting the CO to CO 2 over an extended period of time; bottom flushing the reactor vessel with inert gas over an extended period of time; and then discharging the slag, wherein the oxygen-containing gas is introduced into an upper half of a height of the slag.