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Diagenesis of Buried Chrome Ore Processing Residue
The purpose of this study was to investigate mineralogical changes that have taken place in buried COPR due to hydration of mineral phases that were produced during ore processing. Along with the high-temperature phases, hydration products have been identified and quantified using x-ray powder diffraction (XRD) with whole pattern (Rietveld) fitting. Detailed chemical compositions of all phases were determined using scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) of particulate (3D imaging) and polished sections (2D imaging). Laboratory experiments were conducted using a synthetic brownmillerite to determine reaction pathways and rates of mineral transformation. When the experiments were run for 200 days and longer with calcium chromate, lithified pellets were observed. Electron micrographs showed that the pellets are composed of hydrogarnet with residual brownmillerite fragments, which were cemented by calcium monochromate. These results prove that when chromate availability is high, calcium monochromate is the favored reaction product.
Diagenesis of Buried Chrome Ore Processing Residue
The purpose of this study was to investigate mineralogical changes that have taken place in buried COPR due to hydration of mineral phases that were produced during ore processing. Along with the high-temperature phases, hydration products have been identified and quantified using x-ray powder diffraction (XRD) with whole pattern (Rietveld) fitting. Detailed chemical compositions of all phases were determined using scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) of particulate (3D imaging) and polished sections (2D imaging). Laboratory experiments were conducted using a synthetic brownmillerite to determine reaction pathways and rates of mineral transformation. When the experiments were run for 200 days and longer with calcium chromate, lithified pellets were observed. Electron micrographs showed that the pellets are composed of hydrogarnet with residual brownmillerite fragments, which were cemented by calcium monochromate. These results prove that when chromate availability is high, calcium monochromate is the favored reaction product.
Diagenesis of Buried Chrome Ore Processing Residue
Sass, Bruce M. (author) / Kremser, Daniel T. (author) / Bhargava, Mohit (author) / Lipps, Jody (author)
GeoCongress 2008 ; 2008 ; New Orleans, Louisiana, United States
GeoCongress 2008 ; 399-406
2008-03-07
Conference paper
Electronic Resource
English
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