Method for utilizing slag

Details Method for utilizing slag Method for utilizing slag

2005-11-16

2009-10-06

Wyszomierski, George (Department: 1793)

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

C075S010420, C075S010630

Reexamination Certificate

active

07597736

ABSTRACT:
In a process for utilizing slag containing oxidic iron particles, adding a reducing agent and reducing oxidic iron particles of the slag are charging the slag into a reactor vessel onto a residual iron metal containing dissolved carbon, slowly and continuously over an extended period of time, electric heating the slag and the iron melt over an extended period of time, injecting a carbon-containing reducing agent with inert gas over an extended period of time by a lance into a region close to the boundary surface between the slag and the iron melt or directly into the iron melt, dissolving the carbon of the reducing agent in the iron melt and reducing oxidic iron particles of the slag with metallic iron and CO being formed, 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 or oxygen into the foamed slag and postcombustion of CO to CO2over an extended period of time, bottom flushing the reactor vessel with inert gas over an extended period of time, discharging the treated slag and optionally subsequently the discharging iron melt, whereby a residual iron melt containing dissolved carbon is left in the reactor vessel.

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