Patent ID: 6364929
Filing Date: 2002-04-02
Classification: C21B,C22B,Y02P,Y02W

Abstract:
A method for processing steel slags and iron carriers, the method comprising:mixing the steel slags with the iron carriers to obtain a mixed slag having a basicity Ca/SiO2 of between 1.2 and 2.5; transferring the mixed slag and carbon carriers into a hearth furnace or ladle containing molten iron, the ratio of the mixed slag to the molten iron being between 0.5:1 and 1.5:1; top-blowing hot air onto the mixed slag within the furnace or ladle through a mouth of a lance extending within the furnace or ladle for afterburning carbon monoxide (CO) formed from carbon in the mixed slag at a post-combustion degree PC (CO2+H2O)/(CO+CO2+H2+H2O) of between 0.70 and 0.85 to generate hot offgases; and drawing off the hot offgases tangentially to an axis of the mouth of the feeding lance.