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Title: Investigation of stabilization/solidification for treatment of electric arc furnace dust: Dynamic leaching of monolithic specimens

Abstract

Diffusion-controlled leaching of heavy metals (Cr, Ni, Pb and Zn) from electric arc furnace dust treated with ground granulated blast furnace slag (GGBFS) and with ordinary Portland cement (OPC) was evaluated. Monolithic specimens were evaluated under dynamic leaching conditions for 84 days with periodic leachant renewal. The influence of leaching time, nature of the leachant, binder type and the water/solid ratio of the monoliths were investigated. Results obtained showed both binders can immobilize heavy metals in the monoliths under dynamic leaching conditions, with cumulative quantity of leached metal under 0.138 mg (Cr). Alkaline leachant increased metal release from specimens and reducing the water/solid ratio of the monolith allowed for a decrease in the cumulative mass of metals leached. Chemical and mineralogical characterizations indicated that the metals were evenly distributed throughout the specimens for both binders. Decalcification was observed on the OPC monolith border following leaching. This decrease in Ca corresponded to an altered zone (20 {mu}m), identified by scanning electron microscopy. The GGBFS sample did not show an altered zone.

Authors:
 [1];  [1]
  1. Centre de Recherche sur les Infrastructures en Beton, Departement de Geologie et de Genie Geologique, Universite Laval, Quebec, Qc, G1K 7P4 (Canada)
Publication Date:
OSTI Identifier:
21033054
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 37; Journal Issue: 12; Other Information: DOI: 10.1016/j.cemconres.2007.08.025; PII: S0008-8846(07)00194-9; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BLAST FURNACES; DIFFUSION; DUSTS; ELECTRIC ARCS; HEAVY METALS; LEACHING; MICROSTRUCTURE; PORTLAND CEMENT; SCANNING ELECTRON MICROSCOPY; SLAGS; SOLIDIFICATION; STABILIZATION; WASTE MANAGEMENT

Citation Formats

Laforest, Guylaine, and Duchesne, Josee. Investigation of stabilization/solidification for treatment of electric arc furnace dust: Dynamic leaching of monolithic specimens. United States: N. p., 2007. Web. doi:10.1016/j.cemconres.2007.08.025.
Laforest, Guylaine, & Duchesne, Josee. Investigation of stabilization/solidification for treatment of electric arc furnace dust: Dynamic leaching of monolithic specimens. United States. https://doi.org/10.1016/j.cemconres.2007.08.025
Laforest, Guylaine, and Duchesne, Josee. 2007. "Investigation of stabilization/solidification for treatment of electric arc furnace dust: Dynamic leaching of monolithic specimens". United States. https://doi.org/10.1016/j.cemconres.2007.08.025.
@article{osti_21033054,
title = {Investigation of stabilization/solidification for treatment of electric arc furnace dust: Dynamic leaching of monolithic specimens},
author = {Laforest, Guylaine and Duchesne, Josee},
abstractNote = {Diffusion-controlled leaching of heavy metals (Cr, Ni, Pb and Zn) from electric arc furnace dust treated with ground granulated blast furnace slag (GGBFS) and with ordinary Portland cement (OPC) was evaluated. Monolithic specimens were evaluated under dynamic leaching conditions for 84 days with periodic leachant renewal. The influence of leaching time, nature of the leachant, binder type and the water/solid ratio of the monoliths were investigated. Results obtained showed both binders can immobilize heavy metals in the monoliths under dynamic leaching conditions, with cumulative quantity of leached metal under 0.138 mg (Cr). Alkaline leachant increased metal release from specimens and reducing the water/solid ratio of the monolith allowed for a decrease in the cumulative mass of metals leached. Chemical and mineralogical characterizations indicated that the metals were evenly distributed throughout the specimens for both binders. Decalcification was observed on the OPC monolith border following leaching. This decrease in Ca corresponded to an altered zone (20 {mu}m), identified by scanning electron microscopy. The GGBFS sample did not show an altered zone.},
doi = {10.1016/j.cemconres.2007.08.025},
url = {https://www.osti.gov/biblio/21033054}, journal = {Cement and Concrete Research},
issn = {0008-8846},
number = 12,
volume = 37,
place = {United States},
year = {Sat Dec 15 00:00:00 EST 2007},
month = {Sat Dec 15 00:00:00 EST 2007}
}