By applying the Rist model to the blast furnace No.3 of TangGang works (China), the operating lines were calculated through which the coke rate and fuel rate were evaluated. The obtained data were compared to the operating lines in the blast furnace of Muroran works of Hokkai steel. The estimated comparative data clarified the effects of the various operating parameters on the operating line of the blast furnace No.3 of TangGang. From these parameter dependencies, the cause of the high coke rate of the blast furnace No.3 of TangGang works have been discussed; a strong measure for the reduction of the coke rate have been suggested. According to the above, it was confirmed that the Rist model was very effective method to solve the real problems of blast furnaces despite of its simplicity.
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