The speciation and distribution of Cr(VI) in the solid phase was investigated for two types of chromite ore processing residue (COPR) found at two deposition sites in the United States: gray-black (GB) granular and hard brown (HB) cemented COPR. COPR chemistry and mineralogy were investigated using micro-X-ray absorption spectroscopy and micro-X-ray diffraction, complemented by laboratory analyses. GB COPR contained 30percent of its total Cr(VI) (6000 mg/kg) as large crystals(>20 ?m diameter) of a previously unreported Na-rich analog of calcium aluminum chromate hydrates. These Cr(VI)-rich phases are thought to be vulnerable to reductive and pH treatments. More than 50percent of the Cr(VI) was located within nodules, not easily accessibl...
South Africa holds more than 70% of the world’s viable chromite ore reserves and produces ~46.2% of ...
Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ...
Barium addition to chromite ore processing residue COPR was investigated in order to address a th...
The speciation and distribution of Cr(VI) in the solid phase was investigated for two types of chrom...
Chromite Ore Processing Residue (COPR) contains high concentrations of hexavalent chromium (Cr(VI)),...
Chromite Ore Processing Residue (COPR) contains high concentrations of hexavalent chromium (Cr(VI)),...
Chromite Ore Processing Residue (COPR) contains high concentrations of hexavalent chromium (Cr(VI)),...
Experimental and modeling studies were conducted to delineate the reaction progress of chromite ore ...
South Africa holds more than 70% of the world's viable chromite ore reserves and produces ~46.2% of ...
Batch leaching tests, qualitative and quantitative x-ray powder diffraction (XRPD) analyses, and geo...
Chromite Ore Processing Residue (COPR) is an industrial waste containing up to 7% chromium (Cr) incl...
The Stoppani factory manufactured chromium for more than one century, dumping millions of tons of Ch...
The Stoppani factory manufactured chromium for more than one century, dumping millions of tons of Ch...
Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ...
Chromium (Cr) contamination of natural resources from unregulated disposal of pretanning industrial ...
South Africa holds more than 70% of the world’s viable chromite ore reserves and produces ~46.2% of ...
Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ...
Barium addition to chromite ore processing residue COPR was investigated in order to address a th...
The speciation and distribution of Cr(VI) in the solid phase was investigated for two types of chrom...
Chromite Ore Processing Residue (COPR) contains high concentrations of hexavalent chromium (Cr(VI)),...
Chromite Ore Processing Residue (COPR) contains high concentrations of hexavalent chromium (Cr(VI)),...
Chromite Ore Processing Residue (COPR) contains high concentrations of hexavalent chromium (Cr(VI)),...
Experimental and modeling studies were conducted to delineate the reaction progress of chromite ore ...
South Africa holds more than 70% of the world's viable chromite ore reserves and produces ~46.2% of ...
Batch leaching tests, qualitative and quantitative x-ray powder diffraction (XRPD) analyses, and geo...
Chromite Ore Processing Residue (COPR) is an industrial waste containing up to 7% chromium (Cr) incl...
The Stoppani factory manufactured chromium for more than one century, dumping millions of tons of Ch...
The Stoppani factory manufactured chromium for more than one century, dumping millions of tons of Ch...
Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ...
Chromium (Cr) contamination of natural resources from unregulated disposal of pretanning industrial ...
South Africa holds more than 70% of the world’s viable chromite ore reserves and produces ~46.2% of ...
Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ...
Barium addition to chromite ore processing residue COPR was investigated in order to address a th...