| 摘要 |
PROBLEM TO BE SOLVED: 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. SOLUTION: 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 deg.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.
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