2019 Volume 59 Issue 5 Pages 810-819
Application of high-carbon metallic briquette (HCMB) in the blast furnace (BF) ironmaking for coke saving was previously proposed. This paper is focused on clarifying the in-furnace phenomena and demonstrating the advantages of applying the HCMB in BF ironmaking. A mathematical model has been formulated based on the gas-solid counterflow and its validity was confirmed by the comparison of the simulation results with the averaged industrial data from a BF with a productivity of 6250 tHM/day. Afterward, BF operations under two HCMB mixing ratios (5% and 10%) were simulated. Simulation results indicate that charging HCMB in BF can suppress the coke gasification and improve the ore reduction above the CZ. Coke of approximately 12 kg could be saved for producing one-ton hot metal from the ore under an HCMB mixing ratio of 5%, and approximately 17 kg under an HCMB mixing ratio of 10%. Simulation results still indicate that the reasonable mixing ratio of HCMB is less than 5%, under which, significant changes of the BF operation conditions for HCMB charging are not required.