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Vol.45, No.8, 458 ~ 465, 2007
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| Title |
| Smelting & Refining ; Thermal Reduction of Zinc Oxide in EAF Dust by Solid Carbon under Non-Isothermal Condition |
| 김동식 Dong Sik Kim , 박진태 Jin Tae Park , 김병수 Byung Su Kim , 김민석 Min Seuk Kim , 유재민 Jae Min Yoo |
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| Abstract |
| Thermal reduction of zinc oxide contained in the electric arc furnace (EAF) dust by solid carbon is very important in the rotary kiln process for recovering zinc. In the present study, the zinc oxide in EAF dust was reduced by solid carbon at elevated temperatures using pellets of the diameters varying from 0.3 to 1.4 cm. Experiments was carried out in the temperature range of 800~1,200℃ with various heating rates of 1-9℃/min. The amount of solid carbon mixed in the pellets was 1.0~2.5 times the stoichiometric amount for the reduction of zinc oxide. Dry air of 100ml/min was supplied in the reaction chamber during the reduction process. The results indicated that the reduction volatilization ratio of zinc oxide depended significantly on the amount of solid carbon mixed in the pellets, but not so much on the size of pellets. For pellets of 0.8-1.0 cm in diameter containing the carbon of 2 times the stoichiometric amount, the reduction volatilization ratio of zinc oxide in the pellets was over 95% at the temperature range of 950~1200℃ for all heating rates. On the other hand, the reduction ratio was below 70% for pellets with a heating rate of 1℃/min at the temperature range of 800~1,200℃. |
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| Key Words |
| rotary kiln, EAF dust, zinc oxide, thermal reduction, carbon |
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