| 摘要 |
1421524 Passivating ferrous pellets MIDREX CORP 8 Feb 1974 [21 Feb 1973] 05897/74 Heading C7U Prereduced ferrous pellets are passivated in a chamber by supplying air through an opening 30 by a fan 31 at intervals, e.g. one minute every 4 hours for 60 hours. The bottom of the chamber has a layer of sand 44 and crushed stone 46. Passivated pellets are removed through pipes 38. |
