Characterization of Chromite Ore Processing Residue
Publication: Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 11, Issue 4
Abstract
This paper summarizes the characteristics of chromite ore processing residue (COPR) in terms of their chemical compositions, phases, and recycling potential of iron and chromium through preliminary magnetic separation. COPR from nine hazardous waste sites in Hudson County, N.J., were analyzed using nondestructive instruments including environmental scanning electron microscope, x-ray diffraction spectrometer, and x-ray fluorescence spectrometer. The test results revealed that major phases of COPR were , iron/chromium containing spinel, and . Concentrations of iron-containing phases, calculated as , ranged from 10 to 33% by weight. The COPR samples from nine sites can be divided into two groups, one with high concentration of iron oxide (20–33%) in a form of spinel having magnetic property, and another with low concentration of iron oxide (10–15%) without magnetic property. The manual/dry magnetic separation was able to concentrate iron and chromium oxides in COPR from the former group to 34.9–40.9 and 6.3–8.6%, respectively. The morphology of COPR from a sample containing high iron content revealed that COPR is mainly the remnant of chromite ore. The characteristics of COPR are different from those chromium-contaminated soils from other sources. The study will provide essential information for further remediation and recycling potential for COPR.
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Acknowledgments
The writers wish to acknowledge NSF Grant No. NSFECS-9214571 to NJIT to create a state-of-the-art Geo-environmental laboratory. This facility was used to conduct this research. The writers also acknowledge the suggestions made by the reviewers, which significantly improved the presentation.
References
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Published In
Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 11 • Issue 4 • October 2007
Pages: 234 - 239
Copyright
© 2007 ASCE.
History
Received: Jul 14, 2006
Accepted: Feb 27, 2007
Published online: Oct 1, 2007
Published in print: Oct 2007
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