| 摘要 |
<p>The present invention provides a method of operating a blast furnace, in blast furnace operation using a large amount of fired pellets as an iron-containing material, which mixes carbon-containing non-fired pellets with the fired pellets to charge them in proximity with the fired pellets with their inferior reducibility so as to eliminate locations of delayed reduction in the vicinity of a melting zone in the furnace and obtain a thin melting zone structure to thereby achieve a large effect of reduction of the specific consumption of fuel during blast furnace operation, that is, a method of operating a blast furnace in blast furnace operation using carbon-containing non-fired pellets which alternately charges an iron-containing material and coke in layers from a top of the blast furnace, comprising (i) mixing in advance carbon-containing non-fired pellets and fired pellets and charging a mixture of the carbon-containing non-fired pellets and the fired pellets so as to replace part of the iron-containing material layer and (ii) adjusting a mixing ratio of the carbon-containing non-fired pellets and the fired pellets so that a ratio R (kg/tp)/P(kg/tp) of a specific consumption R of the carbon-containing non-fired pellets (kg/tp) and a specific consumption P of the fired pellets (kg/tp) becomes 0.09 to 0.31.</p> |
