非鉄金属含有電気炉製鋼ダストの乾式処理に関する解析

概要

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Thermodynamic evaluation was carried out for the fuming process of electric are furnace dust. Dust containing 34 % Fe, 24 % Zn and 3 % Pb was chosen for equilibrium calculation. Effects of temperature and amounts of carbon, water vapor and participating air on the volatilization behavior of zinc, lead and halogens and on the composition of the resultant slag or clinker were examined. It was clarified that Pb and Zn remain mostly in the condensed phases under oxidizing conditions, whereas they vaporize as Pb (g), PbS (g), PbCl (g) and Zn (g) under reducing conditions. Judged from the results, the temperature higher than 1, 200゜C is required to realize a high recovery of zinc. By addition of water the decomposition of halides is enhanced, but no significant effect is observed for vaporization of Pb and Zn. The condition for metallic iron to precipitate was shown as a function of temperature and C addition. Matte-making to extract copper, nickel and valuable metals from the dust was discussed from thermodynamic point of view. Substantial recoveries of these metals are expected when the matte is produced just before metallic iron precipitation.
社団法人資源・素材学会の論文
1999-10-25