Abstract
Chemical analysis shows that electric-arc-furnace (EAF) dust obtained from 13 steelmaking factories in Taiwan is composed chiefly of Fe (15–37%), Zn (7–28%) and Mn (1.55–3.99%) and that the mineral composition is mainly (Mn, Zn) Fe2O4, ZnO and ZnCl2·4Zn(OH)2·H2O. It was also found that EAF dust exists as irregular agglomerates from 3 to 20 μm in size and are made up of much smaller round particles from 0.3 to 1 μm in size. ZnCl2 gas in the dust condenses after passing through the EAF gas-cooler system binding small particles of Mn-Zn ferrite together. The agglutinative substance was identified as being ZnCl2·4Zn(OH)2·H2O possibly arising from the interaction between ZnCl2 and ZnO adhering to the Mn-Zn ferrite particles; a conjecture supported by the fact that EAF dust dissolves easily in hydrochloricacid solution leaving only loosely aggregated Mn-Zn ferrite material.
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Li, CL., Tsai, MS. A crystal phase study of zinc hydroxide chloride in electric-arc-furnace dust. Journal of Materials Science 28, 4562–4570 (1993). https://doi.org/10.1007/BF00414243
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DOI: https://doi.org/10.1007/BF00414243