Reduction of specific coke consumption in blast furnace by impact on thermal reverse zone

At the blast furnace of PJSC “Magnitogorsk Metallurgical Plant” (MMK), specific consumption coke was reduced by impact on thermal reverse zone (TRZ) increasing natural gas above 120 m 3 /t cast iron under conditions increased reactivity and hot strength coke. In first pair periods, an increase in CRI from 38.4 to 39.3 % with a decrease CSR 36.3 34.6 accompanied ratio total oxygen entering 0.43 0.45 123.2 133.5 iron. The set actions TRZ length towards blast-furnace mouth 1.9 its unchanged location along lower part. Reducing heat temperature difference between materials there average 36 °С. second 143.9 content 27.6 27.0. They were following changes processes consideration: 2.6 distance tuyere hearth 3.4 %, degree carbon reduction 32.0 33.3 insignificant (on 0.3 °С) TRZ. 4.7 kg/t productivity 27 t/day. Conditions course ensured 1.6 led production 41