| 摘要 |
An improved process for the production of metallic iron by direct reduction of iron ores at relatively high temperatures. The ore is staged in a series of beds, fluidized by contact with ascending gas, and reduced. In ferric reduction zones, ferric oxide (hematite) is reduced to magnetic oxide of iron (magnetite), and the latter is thence reduced to substantially ferrous oxide (wustite). In the ferrous reduction zone, or zones, the ferrous oxide is reduced to metallic iron. By addition or incorporation with the partially reduced ore of a ferrous reduction zone, or zones, of critical amounts of salts formed from Groups I-A, II-A and III-A metals, and metalloids, particularly halide salts and nonoxide-forming hydroxides and carbonates of such metals, the overall rate of reduction of the ore is promoted and metallization increased without significant adverse effects due to bogging. The process has special utility with regard to the reduction of specular hematite ores, particularly with carbon monoxide and carbon monoxide-containing gases.
|
