Evaluating the effectiveness of using coke breeze in blast-furnace smelting

The expediency of using various amounts of nut coke in blast-furnace smelting is evaluated in relation to the quality of the skip coke. Data from blast-furnace operation are analyzed to obtain relations expressing the dependence of the consumption of nut coke on the unit consumption of skip coke and its abradability index M 10 . A blast furnace can run smoothly with the use of nut coke if its concentration in the charge does not exceed 20 kg/ton pig iron and the abradability index of the skip coke is satisfactory (M 10 ≤ 9.0%). The average value of the coke-substitution equivalent was determined to be 0.67 kg/kg nut coke.