Treatment of Cr(VI) in COPR Using Ferrous Sulfate–Sulfuric Acid or Cationic Polysulfides
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 134, Issue 12
Abstract
Column tests were conducted to evaluate two treatment strategies for reducing and stabilizing hexavalent chromium, Cr(VI), in chromium ore processing residue (COPR): permeation with a solution and blending with a cationic polysulfide reagent . Cr(VI) leached at concentrations exceeding from untreated COPR permeated with synthetic groundwater for pore volumes of flow (PVF), and concentrations of Cr(VI) in the solid phase remained high . Permeation with solutions containing eliminated Cr(VI) from the effluent after initial, elevated leaching of Cr(VI) ; however, high solid-phase concentrations of Cr(VI) remained in the column residuals . COPR treated with leached Cr at for 23.5 PVF and had solid-phase concentrations of Cr(VI) , although mineralogical analyses of treated solids showed potential chromate-containing mineral phases. Mineralogical analyses showed that precipitation and cementation occurred in the pore space of the COPR permeated with , initially lowering the hydraulic conductivity > two orders of magnitude. However, acid dissolution channels eventually formed, resulting in preferential flow. COPR permeated with contained less brownmillerite and Cr(VI)-bearing hydrocalumite and hydrogarnet relative to untreated COPR. For COPR treated with , S encapsulated the subparticles of COPR with some micropore penetration, suggesting permanence of excess reductant after leaching with 23.5 PVF of synthetic rainwater.
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Acknowledgments
John Fournelle (Eugene Cameron Electron Microprobe Laboratory) and Huifang Xu (S.W. Bailey X-Ray Diffraction Laboratory) of the University of Wisconsin-Madison assisted with the experimental setup for the mineralogical analyses; their assistance is gratefully acknowledged. Funding for this research was provided by the Federal Highway Administration through the Dwight D. Eisenhower Fellowship Program, the State of Wisconsin through the Wisconsin Industrial and Economic Development Research Program, and the Graduate School at the University of Wisconsin-Madison. Redox Solutions provided the reagent used in this study and funding for the -treated column study. RMT Inc. of Madison Wisconsin conducted the ICP analyses and assisted with the experimental design. Battelle Laboratories of Columbus Ohio assisted with the quantitative analysis of XRD scans.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 134 • Issue 12 • December 2008
Pages: 1791 - 1803
Copyright
© 2008 ASCE.
History
Received: Jul 11, 2006
Accepted: Feb 22, 2008
Published online: Dec 1, 2008
Published in print: Dec 2008
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