Title
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In-situ chromium and vanadium recovery of landfilled ferrochromium and stainless steel slags
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Author
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Abstract
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A novel heap leaching method was investigated for selective removal of chromium (Cr) and-vanadium (V) from ferrochromium (FeCr) and stainless steel (SS) slags. In particular, alkaline oxidative heap leaching was simulated on lab-scale by batch and column leaching tests. The results show a selective leaching of Cr (11-19%) and V (7.0-7.5%) after 64 days of column leaching, with a very low dissolution (<2.2% (FeCr slag) and <0.15% (SS slag)) of matrix elements (e.g. Al, Fe, Si, Mg, Ca), when NaOCl is applied as oxidation agent and NaOH as alkaline agent. Furthermore, the used leaching liquor is reactive for a longer period of time, indicating that circulation of leaching liquor could be possible. Finally, the experimental results were fed into a first-order model which predicts that Cr will continue to leach from the tested slags for 4-5 years at a chosen infiltration rate of 73,000 l/(y m(2)). (C) 2016 Elsevier B.V. All rights reserved. |
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Language
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English
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Source (journal)
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Chemical engineering journal. - Lausanne, 1996, currens
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Publication
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Lausanne
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Elsevier Sequoia
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2016
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ISSN
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1385-8947
[print]
1873-3212
[online]
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DOI
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10.1016/J.CEJ.2016.05.128
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Volume/pages
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303
(2016)
, p. 359-368
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ISI
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000383522800036
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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