| 摘要 |
PROBLEM TO BE SOLVED: To improve the gas utilizing ratio and to reduce the fuel ratio by hot-forming the mixture of a powdery ore and powdery coal in the state of heating at a specified temp. to make briquette, and mixing into raw material for blast furnace of sintered ore, etc., and charging into the blast furnace. SOLUTION: The mixture of the powdery ore and the powdery coal is made to briquette by hot-forming in the state of heating at a temp. of 350-550 deg.C and the briquette are mixed into the raw material for blast furnace of the sintered ore, pellet, bulky ore, etc., and to be desirably charged into the blast furnace. In this way, the coal and the ore in the briquette start the direct reducing reaction (endothermic reaction) from the low temp. range on the appearance, and since the gas generated with the reaction mainly is CO gas, this gas is utilized to the reduction of the sintered ore, pellet, bulky ore, etc. Then, as the powdery coal, in the case of using the powdery coal having such Gieseler max. fluidity(MF) so as to satisfy Log MF>0.5, the briquette having a high density and crushing strength is obtd. by utilizing the caking property displayed at the heating time.
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