| 摘要 |
<p>1292978 Reducing iron ore ESSO RESEARCH & ENG CO 31 Dec 1969 [7 Jan 1969 23 Sept 1969] 63483/69 Heading C7D Metallic iron is produced in a process comprising feeding particulate iron ore solids through a series of staged beds in which they are fluidized by contact with reducing gas and progressively reduced to provide both ferric and ferrous reduction zones, there being added, directly to a ferrous reduction zone one or more additives selected from carbonates, oxides and hydronides of Group IA metals, salts other than carbonates of metals of Groups IA, IIA, IIIA (Deming Table) and halogen compounds of metalloids of Group IIIA, sufficient to increase the rate of reduction at the existing conditions. Specified additives are NaCl, NaOH, Na 2 CO 3 , CaCl 2 , Na 2 SO 4 , LiCl, Li 2 CO 3 , KBr, BaCl 2 , MgF 2 , Ca(OBr) 2 , CaSO 4 , SrCl 2 , BaCl 2 , BaSO 4 , BCl 3 , BF 3 and AlCl 3 . The concentration of the additives is preferably 0À1-6% by weight. Operating temperatures are preferably 1200-1700‹F. in the ferrous reduction stage. The ore may be specular haematite and the reducing gas a CO/H 2 mixture which may also contain H 2 O, N 2 and CO 2 .</p> |
