To eliminate the defective movement in after-process with bulky pellet and to prevent the lowering of a production efficiency by regulating oxide quantity in a pellet to not lower than a specified value when the temperature of the reduced pellet is not lower than a specified value.
In the case of reducing a green ball composed of mixed powder of iron ore, coal, lime stone and binder under high temperature atmosphere in a reducing furnace, when the temperature of the reduced pellet is ≥900°C, the oxide quantity in the pellet is regulated to ≥11%. Further, desirably, the basicity of the pellet is made to ≥0.5. In this method, the mutual sticking of the metal among the reduced pellets is restrained and the bulky pellet is not clogged in a chuter, etc., and the lowering of the production efficiency can be prevented. For the purpose of further perfectly preventing the sticking, the pellet discharged from a discharging device in the reducing furnace is crushed with a crusher, or the bulky pellet is screened with a screening machine and it is desirable to crush only the bulky pellet.
| WO/2003/102249 | FURNACE SIDEWALL STRUCTURE OF ROTARY HEARTH FURNACE |
| JPS52133002 | CLASSIFICATION OF REDUCED PRODUCT |
HIRATA KOICHI
FUJIOKA HIRONORI
MIZUSHIRO HIDEAKI
SATO KEIICHI
