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Original Articles

Estimation of Fluorine and Sulfur Behaviors Affected by Converter Off-Gas Dusts

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Pages 984-1001 | Received 18 Aug 2010, Accepted 22 Feb 2011, Published online: 14 Sep 2011
 

Abstract

Converter steelmaking produces a large amount of high-temperature flue, which contains pollutant gases (SO2, HF, etc.) and entrains fine dusts (Fe, FeO, Fe2O3, CaO, etc.), and fluorine and sulfur behaviors that were affected by dusts in off-gas are estimated by chemical equilibrium method. The behaviors of fluorine and sulfur in off-gas are very different at reducing and oxidizing atmospheres. At a reducing atmosphere, main fluorides in off-gas are SiF4(g), CaF2(s), HF, and CaF2(g); the main sulfides are FeS2(s), FeS(s), COS(g), SO2(g), and S2(g); and CaO can effectively defluorine at T < 1000 K. At oxidizing atmosphere, main fluorides are SiF4(g), HF, and CaF2(g); the main sulfides are Fe2(SO4)3(s), CaSO4(s), SO2(g), and SO3(g); and defluorination and desulfurization by dusts are completely effectively at MR ≥ 1 and T < 1100 K.

ACKNOWLEDGMENTS

Financial supports by the National Natural Science Foundation of China (No. 50976123) and the Knowledge Innovation Program of the Chinese Academy of Sciences (No. KGCX2-YW-321) are acknowledged.

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