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Applying high-carbon metallic briquette in blast furnace for coke saving |
RONG Tao, TANG Hui-qing, FAN Kai, SUN Yan-jun |
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract The blast furnace (BF) ironmaking is the dominant process for hot-metal production and the low-coke operation in BF ironmaking has been long focused. 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 mass percent of the HCMB sample was 15.6%. Under the simulated BF conditions, the behavior of the HCMB, including mass change, crushing strength change, and microstructure evolution was examined. The gasification kinetics of the HCMB carbon was investigated using the custom-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 2 500 m3 indicate that by mixing 5% HCMB in the ore burden, the BF can realize coke reduction of 11.9 kg for producing 1 t hot metal from the ore, and a productivity increase of 419 t/d; moreover, change of the BF operation condition is not required.
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Received: 29 July 2019
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