Journal
HYDROMETALLURGY
Volume 166, Issue -, Pages 1-8Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.hydromet.2016.08.004
Keywords
Zinc-containing electric arc furnace dust; Crystalline phase; FeCl3 center dot 6H(2)O; Hydrothermal extraction; Migration behavior; Process development
Categories
Funding
- National Basic Research Priorities Program of China [2014CB643401, 2013AA032003]
- National Natural Science Foundation of China [51372019]
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We herein report elemental migration during the hydrothermal treatment of zinc-containing electric arc furnace dust (Zn-containing EAFD). Initially, the Zn-containing EAFD was characterized and the crystalline phases of Zn, lead (Pb), and chromium (Cr) were determined to be mainly in the form of (Zn,Mn)Fe2O4, PbO (PbSO4), and Cr2O3 (CrO3/CrO42-), respectively. Subsequently, the elemental migration and transformation behavior during the Zn hydrothermal extraction process using ferric chloride hexahydrate (FeCl3 center dot 6H(2)O) was studied in detail. Results indicated that under optimum leaching conditions, Zn, Pb, calcium (Ca), and manganese (Mn) were extracted with high leaching efficiencies of 97.4%, 98.3%, 93.4%, and 97.5%, respectively. Furthermore, suitable adjustment of the leaching solution pH resulted in the simultaneous precipitation of Fe, Zn, Mn, and Pb ions in the form of the stable spinet ferrite MFe2O4 (M: Zn, Mn, and Pb), which was recovered following calcination of the precipitate at 1000 degrees C for 2 h. Meanwhile, the majority of Fe, total Cr, and silicon (Si) existed as Fe2O3, Cr2O3, and SiO2, respectively, in the leaching residue, which can be recycled in the steel mill. (C) 2016 Elsevier B.V. All rights reserved.
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