| 摘要 |
PURPOSE:To effectively execute smelting reduction in a small-scaled equipment by introducing exhaust gas of a smelting reduction furnace to a dry type dust collector through a rotary kiln and a dryer, and bringing lump raw material into contact with the exhaust gas by counterflow from the dryer to the above kiln and furnace. CONSTITUTION:The exhaust gas A having high temp. exhausted from the smelting reduction furnace 1 is sent to the rotary kiln 2 by a suction fan 5, and brought into contact with the lump raw material B carried by counterflow to the exhaust gas A in the kiln 2, to preheat and prereduce the lump raw material B. In this way, the temp. of exhaust gas A flowed out from the kiln 2 is fallen, and the fallen temp. exhaust gas A is next sent to the dryer 3. The lump raw material with wet condition charged from charging hole 3a at downstream side of exhaust gas of the dryer 3, is carried by the counterflow to the exhaust gas A and brought into contact with the exhaust gas. In this way, as the exhaust gas A is further fallen, and flowed out from the dryer 3, the exhaust gas A can be treated in the ordinary dry type dust collector 4. Further, as the lump raw material carried from the kiln 2 to the furnace 1 is preheated and prereduced, the smelting reduction is effectively executed.
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