Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/66346
Title: Detoxification and immobilization of chromite ore processing residue in spinel-based glass-ceramic
Authors: Liao, CZ
Tang, YY
Lee, PH 
Liu, CS
Shih, KM
Li, FB
Keywords: Detoxification
Immobilization
Chromite ore processing residue (COPR)
Glass-ceramic
Rietveld quantitative XRD
Issue Date: 2017
Publisher: Elsevier
Source: Journal of hazardous materials, 5 Jan. 2017, v. 321, p. 449-455 How to cite?
Journal: Journal of hazardous materials 
Abstract: A promising strategy for the detoxification and immobilization of chromite ore processing residue (COPR) in a spinel-based glass-ceramic matrix is reported in this study. In the search for a more chemically durable matrix for COPR, the most critical crystalline phase for Cr immobilization was found to be a spinel solid solution with a chemical composition of MgCr1.32Fe0.19Al0.49O4. Using Rietveld quantitative X-ray diffraction analysis, we identified this final product is with the phases of spinel (3.5 wt.%), diopside (5.2 wt.%), and some amorphous contents (91.2 wt.%). The partitioning ratio of Cr reveals that about 77% of the Cr was incorporated into the more chemically durable spinel phase. The results of Cr K-edge X-ray absorption near-edge spectroscopy show that no Cr(VI) was observed after conversion of COPR into a glass-ceramic, which indicates successful detoxification of Cr(VI) into Cr(III) in the COPR-incorporated glass-ceramic. The leaching performances of Cr2O3 and COPR-incorporated glass-ceramic were compared with a prolonged acid-leaching test, and the results demonstrate the superiority of the COPR-incorporated glass-ceramic matrix in the immobilization of Cr. The overall results suggest that the use of affordable additives has potential in more reliably immobilizing COPR with a spinel-based glass-ceramic for safer disposal of this hazardous waste.
URI: http://hdl.handle.net/10397/66346
ISSN: 0304-3894
EISSN: 1873-3336
DOI: 10.1016/j.jhazmat.2016.09.035
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