Abstract：Blast furnace (BF) ironmaking is the dominant process for hot-metal production and low-coke operation in BF ironmaking has been long focused. In the present research, applying high carbon metallic briquette (HCMB) in BF for coke saving has been studied. The HCMB was prepared using ultrafine iron oxide and non-coking coal fines, and the carbon content of the HCMB sample was 15.6 wt%. Under the simulated blast furnace (BF) environment, behavior of the briquette, including mass change, crushing strength change, and microstructure evolution, were examined. The gasification kinetics of the HCMB carbon was investigated using the custuom-built experimental setup. The coke saving effect of applying HCMB in the BF was analyzed by simulations. Experimental results show that, an iron crust was formed in the outer periphery of the briquette under the BF simulation conditions and the briquette has a good anti-pulverization capability; the main reaction of the briquette is carbon-solution loss reaction, and the briquette has a high CO2 reactivity in the BF. Simulation results on a BF of 2500 m3 indicate that, by mixing 5% HCMB in the ore burden, the BF can realize coke reduction of 11.9 kg for producing one-ton hot metal from the ore, and a productivity increase of 419 tHM·day-1; moreover, change of the BF operation condition is not required.
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2020, Vol. 55 
