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Elimination of zinc ferrite for hydrometallurgical recovery of zinc from EAF dust
RISE, Swerea, Swerea MEFOS.
RISE, Swerea, Swerea MEFOS.
Engitec Srl.
Ferriere Nord SpA.
Show others and affiliations
2006 (English)In: 2006 TMS Fall Extraction and Processing Division: Sohn International Symposium, 2006, Vol. 6, p. 397-411Conference paper, Published paper (Refereed)
Abstract [en]

Hydrometallurgical zinc recovery from EAF dust has several advantages compared to pyrometallurgical alternatives in terms of low temperature operation, lower energy consumption and higher flexibility. Many hydrometallurgical processes have been suggested and tested over the years without success. The main reasons are: - Low leaching yield of zinc due to the fact that a high fraction of ZnO in the EAF dust exists in the zinc ferrite structure which makes selective leaching of ZnO not possible - Many of the proposals could not handle the halide in the EAF dust To eliminate these two disadvantages, two zinc ferrite elimination concepts have been tested and developed in the REZIN project of the EU 5 th Framework Programme. The two concepts for zinc ferrite elimination could be shortly described by the following chemical reactions: A. ZnOFe 2O 3 + 2CaO = Ca 2Fe 2O 5 + ZnO free B. ZnOFe 2O 3 + C = Fe met + CO/CO 2 + ZnO free These two concepts were investigated in details in combination with a subsequent leaching step using the novel EZINC process for recovery of zinc from EAF dust. Leaching of pretreated samples has shown great increases of a zinc recovery yield. A zinc recovery of over 90 % could be reached, as compared to about 50 % for no-pretreated samples. This paper will describe the two concepts in details.

Place, publisher, year, edition, pages
2006. Vol. 6, p. 397-411
Keywords [en]
EAF dust, Hydrometallurgical leaching, Zinc ferrite elimination
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13500Scopus ID: 2-s2.0-33846064743ISBN: 0873396332; 9780873396332 (print)OAI: oai:DiVA.org:ri-13500DiVA, id: diva2:973709
Conference
2006 TMS Fall Extraction and Processing Division: Sohn International Symposium
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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