PURPOSE: To promote the simplification of powdery ore treatment by operating under high blending of cold-bond pellet as compared with sintered raw material as charging raw material in a blast furnace in the oxygen blast furnace operation.
CONSTITUTION: The charging material, in which the blending ratio of the cold- bond pellet is 30W80% of charged iron-contained raw material, is charged from the top of blast furnace 1. Furnace gas is fed to a gas holder 3 through furnace top gas cleaning mechanism 2 and branched enroute and passed through a booster 4, to generate high temp. gas by a preheating gas generator 5 and blown in the furnace 1 from gas blowing holes 6. A part of the furnace gas is passed through a booster 4' to blow in the furnace 1 from tuyeres 9 as temp. adjusting gas in front of the tuyeres 9. On the other hand, oxygen is fed to the above generator 5 and tuyeres 9 from an oxygen source 7, but ordinarily blown from the tuyeres 9 together with fine powdered coal from a fine powdered coal storing vessel 8 as a part of substitute for the coke. In this way, the blast furnace operation by high blending of the cold-bond pellet, which is easily produced from the sintered ore, can be executed and the simplification of powdery ore treatment is promoted.
KAWADA HITOSHI
ONO YOTARO
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