above the bosh the stack extends from the widest part to the top. Its shape is like a frustum of a cone. Here the reduction of the iron oxides to sponge iron takes place.

• 炉身位于炉腹之上，从高炉直径最大处一直到炉顶，其形状就象一个截头圆锥。在这里铁氧化物被还原成海绵铁。