期刊
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
卷 22, 期 8, 页码 788-797出版社
SPRINGER
DOI: 10.1007/s12613-015-1135-6
关键词
electric arc furnace dust; pyrometallurgy; zinc oxide; zinc ferrite; calcium oxide
类别
资金
- ISIJ Innovative Program for Advanced Technology
- Iron and Steel Institute of Japan (ISIJ)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [22656171, 25249105]
- Global COE Program Materials Integration International Center of Education and Research, Tohoku University
- Steel Foundation for Environmental Protection Technology
- Grants-in-Aid for Scientific Research [22656171, 25249105] Funding Source: KAKEN
The non-carbothermic zinc pyrometallurgical processing of electric arc furnace (EAF) dust was investigated on a laboratory scale. The main objective of this process was to convert highly stable zinc ferrite (ZnFe2O4), which accounts for more than half of total zinc in the EAF dust, into ZnO and Ca2Fe2O5 by CaO addition. The EAF dust was mixed with CaO powder in various ratios, pressed into pellets, and heated in a muffle furnace in air at temperatures ranging from 700 to 1100A degrees C for a predetermined holding time. All ZnFe2O4 was transformed into ZnO and Ca2Fe2O5 at a minimum temperature of 900A degrees C within 1 h when sufficient CaO to achieve a Ca/Fe molar ratio of 1.1 was added. However, at higher temperatures, excess CaO beyond the stoichiometric ratio was required because it was consumed by reactions leading to the formation of compounds other than ZnFe2O4. The evaporation of halides and heavy metals in the EAF dust was also studied. These components could be preferentially volatilized into the gas phase at 1100A degrees C when CaO was added.
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