| 摘要 |
<p>PURPOSE:To perform advantageous melt reduction at a low cost without using costly electric power by reactive gaseous flow of a relatively low temp. by making use of the reducing waste gas produced in a vertical furnace by melt reduction for preliminary reducing and by-product gas for powder and granular ore. CONSTITUTION:Preheated air is blown through tuyere groups 5, 5' into a vertical furnace 3 where the packed layer of a carbonaceous solid reducing agent is fired and the reducing waste gas produced in the furnace 3 is discharged from an evacuation port 6. part of the waste gas is supplied 6' to the bottom of a preliminary reduction furnace 2 to dry and heat the powder and granular ore charged in the furnace 2, thereby reducing preliminarily the ore. The partially reduced ore produced in such a way is blown together with the preheating air through a waste ore port 7 and tuyeres 5, 5' into the furnace 3. The partially reduced iron blown together with the preheating air in a high temp. region formed in the furnace 3 is immediately heated and is easily melted. While the iron drops toward the lower part of the furnace 3, the iron is reduced to form a molten metal and molten slag, whereby the smelting is accomplished. The molten metal accumulating on the hearth is removed at a proper time from a tapping port 10 to the outside of the furnace 3. The molten slag is treated in a similar way.</p> |
