| 摘要 |
1485418 Iron oxide pellets USS ENGS & CONSULTANTS Inc 9 Aug 1974 [9 Aug 1973] 35255/74 Heading C1A Iron oxide pellets for use in reducing furnaces have an average diameter of “ to ¥ inch, and comprise (1) iron ore or concentrate which includes 0À5-3À0% SiO 2 together with (2) 0À5-1À5% bentonite as a binder, the pellets having a surface coating which includes 0À5- 4-5 wt. per cent of lime, limestone or dolomite based on the weight of the other dry components in the pellets, the coating having been hardened by firing at 2100-2400‹ F. for 5-15 minutes. The pellets may be made by preparing green pellets from the ore or concentrate and bentonite together with 7-12% moisture, and indurating the green pellets by drying them for up to 6 minutes at 500-700‹ F., preheating at 1700- 2000‹ F. and then firing at 2100-2400‹ F. for 5-15 minutes. In examples, the pellets are made from hematite. |
