| 摘要 |
<p>Particulate spongy iron is produced from particulate oxidic iron ore fluidized within a bed in a reactor by a stream of reducing gas, e.g. H2 and/or CO, by a reduction process at 1000-1800 DEG F., wherein sufficient slurry of one or more finely divided oxides and/or carbonates of Group II, III-A, IV-B or VI-B metals, such as of Mg, Ca, Ti, Zr, Cr, Mo, e.g. dolomite or magnesia, is mixed with the ore feed to provide an additive concentration of 0.1 to 5% by weight of the ore feed to prevent bogging. Dispersing liquids for the slurry include water, acetate solvents, alcohols, glycols, ethers, hydrocarbons, CaCl4, methyl chloroform, amyl chloride, benzine, toluene, xylene and dioxane. The fluidized reduction process is preferably effected within staged beds, e.g. containing two ferric reduction zones wherein ferric oxide is reduced to ferrous oxide and upwardly flowing H2 is burned with O2 - containing gas to provide heat to maintain an operating temperature of 1300-1600 DEG F., and two ferrous reduction zones operating at 1300-1500 DEG F wherein ferrous oxide is reduced to Fe.</p> |
