| 摘要 |
<p>Passivation of sponge iron by a mild reoxidation thereof is effected by contact, at a temperature of 200 DEG to 600 DEG F, with a gaseous atmosphere consisting essentially of 25 to 80% H2, 15 to 70% CO and 0.5% to 4.0% O2 for a time in excess of about 1 hour. The passivation atmosphere may be produced by dilution of a free-oxygen-containing gas with conventional reducing gases. Therefore, the process is particularly amenable to the in-line passivation of hot reduced pellets i.e. wherein passivation may be effected directly within the lower portion of a shaft furnace.</p> |
