Chromium Ore Processing Residue - Maryland
The reduction of chrome bearing ores in the production of industrial grade chromium compounds results in a waste rich in metals contamination. This byproduct is variously referred to as chromite ore processing residue, chrome ore processing residual or chrome tailings; for the purposes of MDE reports these variants are referenced as COPR. There are numerous potential COPRStabilization of chromium ore processing residue (COPR,,20/05/2006· Chromium has been classified as a potential carcinogen , and has high and acute toxicity to humans, animals, plants, and microorganisms. Consequently, chromium contaminant in groundwater, chromium ore processing residue (COPR), and sediment represents a significant environmental and public health concern .Conversion of Chromium Ore Processing Residue to Chrome Steel,Conversion of Chromium Ore Processing Residue to Chrome Steel Introduction Chromium played an important role in the industrial development of New Jersey from 1905 to 1971. During that period, chromate (Cr6+) was produced from chromite ore at three facilities in Hudson County, NJ. During the chromate extraction process, varying amounts of lime and sodaChromite Ore Processing Residue in Hudson County, New Jersey,Chromite ore processing residue is an industrial waste material generated by the manufacturing of chromates for chromite ore. Chromium is present in the trivalent state in the ore as chromium iron oxide (FeCr204). In this state, the chromium is inert and is not soluble in either acid or water. To produce the hexavalent, water-solubleRemediation of chromite ore processing residue using,,Batch tests were conducted to assess the potential use of ferrous sulfate and calcium polysulfide for the remediation of chromite ore processing residue (COPR).Remediation of hexavalent chromium contamination in,,01/05/2017· Chromite ore processing residues (COPR) are hazardous industrial wastes which have been disposed in surface soils at many commercial and industrial sites in the USA, UK, China, Japan, India and in many other countries ( Dhal et al., 2013 ).
Reduction and immobilization of chromate in chromite ore,
Chromite ore processing residue (COPR) poses a great environmental and health risk with persistent Cr (VI) leaching. To reduce Cr (VI) and subsequently immobilize in the solid matrix, COPR was incubated with nanoscale zero-valent iron (nZVI) and the Cr (VI) speciation and leachability were studied.Leaching Mechanism of Cr(VI) from Chromite Ore,The leaching behavior of hexavalent chromium (Cr(VI)) and major metal elements relevant to Cr(VI) leaching from chromite ore processing residue (COPR) to HNO3 are investigated by batch leaching tests. According to the test results, aqueous Cr(VI) accounted for 70-80% of the content of total Cr. Cr(VI) concentration was controlled by the dissolution degree of Cr(VI)-bearing minerals (such as,Soil Suspension/Dispersion Modeling Methods for Estimating,,chromite ore processing residue (COPR)-affected soils is inhalation of hexavalent chromium [Cr(VI)] particulates. Site-specific soil alternative remediation standards (ARSs) are set using soil suspension and dispersion models to be protective of the theoretical excess cancer risk associated with inhalation of soil suspended by vehicle traffic and wind. The purpose of this study was to update,Modifications to EPA Method 3060A that improve the Cr(VI,,Cr(VI) extraction efficiency from chromium ore processing residue (COPR)-contaminated soils Christopher T. Mills1, Carleton R. Bern2, Ruth E. Wolf3, Andrea L. Foster4, Jean M. Morrison1, William M. Benzel5 1) U.S. Geological Survey, Crustal Geophysics and Geochemistry Science Center, MS964D, Denver Federal Center, Denver, CO 80225.Chromite ore processing residue in Hudson County,,01/05/1991· Meegoda J and Kamolpornwijit W (2011) Chromium steel from chromite ore processing residue — A valuable construction material from a waste, Frontiers of Environmental Science & Engineering in China, 10.1007/s11783-011-0325-3, 5:2, (159-166), Online publication date: 1-Jun-2011.Reduction and immobilization of chromate in chromite ore,,Chromite ore processing residue (COPR) poses a great environmental and health risk with persistent Cr(VI) leaching. To reduce Cr(VI) and subsequently immobilize in the solid matrix, COPR was incubated with nanoscale zero-valent iron (nZVI) and the Cr(VI) speciation and leachability were studied. Mul
Remediation of chromite ore processing residue using,
Batch tests were conducted to assess the potential use of ferrous sulfate and calcium polysulfide for the remediation of chromite ore processing residue (COPR). The remediation process entails addition of ferrous sulfate or calcium polysulfide to chemically reduce hexavalent chromium [Cr(VI)] to trivalent chromium [Cr(III)] in slurry form and pH adjustment to precipitate Cr(III) as chromium,Characterization of Chromite Ore Processing Residue,,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,Leaching of hexavalent chromium from young chromite ore,,Leaching of hexavalent chromium from young chromite ore processing residue Katrin Matern1 Harald Weigand2 Ruben Kretzschmar3 Tim Mansfeldt1 1Faculty of Mathematics and Natural Sciences, Dep. of Geosciences, Institute of Geography, Univ. of Cologne, Albertus-Magnus-Platz, Köln, D-50923, Germany 2ZEuUS, THM Univ. of Applied Sciences, Wiesenstr. 14, Gießen, D-35390, Germany 3Soil Chemistry,Optimisation of metal extraction from chromium ore,,10/12/2018· The feasibility of extracting metals from chromium (Cr) ore processing residue (COPR) was investigated. COPR samples collected from four sites in New Jersey, USA (sites A, B, C and D) were mixed with 15% carbon by weight with different percentages of sand to neutralise the basic oxide in COPR and heated under a reducing environment to extract metals.Leaching Mechanism of Cr(VI) from Chromite Ore,The leaching behavior of hexavalent chromium (Cr(VI)) and major metal elements relevant to Cr(VI) leaching from chromite ore processing residue (COPR) to HNO3 are investigated by batch leaching tests. According to the test results, aqueous Cr(VI) accounted for 70-80% of the content of total Cr. Cr(VI) concentration was controlled by the dissolution degree of Cr(VI)-bearing minerals (such as,Soil Suspension/Dispersion Modeling Methods for Estimating,,chromite ore processing residue (COPR)-affected soils is inhalation of hexavalent chromium [Cr(VI)] particulates. Site-specific soil alternative remediation standards (ARSs) are set using soil suspension and dispersion models to be protective of the theoretical excess cancer risk associated with inhalation of soil suspended by vehicle traffic and wind. The purpose of this study was to update,
Modifications to EPA Method 3060A that improve the Cr(VI,
Cr(VI) extraction efficiency from chromium ore processing residue (COPR)-contaminated soils Christopher T. Mills1, Carleton R. Bern2, Ruth E. Wolf3, Andrea L. Foster4, Jean M. Morrison1, William M. Benzel5 1) U.S. Geological Survey, Crustal Geophysics and Geochemistry Science Center, MS964D, Denver Federal Center, Denver, CO 80225.Removal of Hexavalent Chromium from a Contaminated Soil by,,contamination of soils exist in numerous sites as a result of depositing chromite ore processing residue. Electroremediation is well suited for the removal of hexavalent chromium from soils in situ. This thesis studies the removal of hexavalent chromium from a contaminated soil by electromigration. In an experiment at pH 13 using a sodium hydroxide purging solution, a 95 % removal of,Chromite ore processing residue in Hudson County,,01/05/1991· Meegoda J and Kamolpornwijit W (2011) Chromium steel from chromite ore processing residue — A valuable construction material from a waste, Frontiers of Environmental Science & Engineering in China, 10.1007/s11783-011-0325-3, 5:2, (159-166), Online publication date: 1-Jun-2011.Chromite Ore Processing Residue (COPR): Hazardous,,31/03/2005· Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr 6+) at concentrations typically in the range of thousands of milligrams/kilograms, was deposited over a timeframe of 50 years as fill at a site referred to as SA7 in New Jersey.Significant surface heaving associated with COPR weathering-induced mineralogical expansion has been observed at the siteCharacterization of chromite ore processing residue —,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,Characterization of Chromite Ore Processing Residue,,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,
Leaching of hexavalent chromium from young chromite ore,
Leaching of hexavalent chromium from young chromite ore processing residue Katrin Matern1 Harald Weigand2 Ruben Kretzschmar3 Tim Mansfeldt1 1Faculty of Mathematics and Natural Sciences, Dep. of Geosciences, Institute of Geography, Univ. of Cologne, Albertus-Magnus-Platz, Köln, D-50923, Germany 2ZEuUS, THM Univ. of Applied Sciences, Wiesenstr. 14, Gießen, D-35390, Germany 3Soil Chemistry,Adsorption Characteristics and Transport Behavior of,Chromium ore processing residue (COPR), because of its high content of dissolvable Cr(VI), is one of the most hazardous solid wastes . The continuous Cr(VI) leaching from COPR could cause severe pollution to its surrounding environment, including groundwater [6, 10].Remediation of hexavalent chromium contamination in,,Large amounts of chromite ore processing residue (COPR) wastes have been deposited in many countries worldwide, generating significant contamination issues from the highly mobile and toxic hexavalent chromium species (Cr(VI)). In this study, sodium dithionite (Na 2 S 2 O 4) was used to reduce Cr(VI) to Cr(III) in COPR containing high available Fe, and then sodium phosphate (Na 3 POLeaching Mechanism of Cr(VI) from Chromite Ore,The leaching behavior of hexavalent chromium (Cr(VI)) and major metal elements relevant to Cr(VI) leaching from chromite ore processing residue (COPR) to HNO3 are investigated by batch leaching tests. According to the test results, aqueous Cr(VI) accounted for 70-80% of the content of total Cr. Cr(VI) concentration was controlled by the dissolution degree of Cr(VI)-bearing minerals (such as,Soil Suspension/Dispersion Modeling Methods for Estimating,,chromite ore processing residue (COPR)-affected soils is inhalation of hexavalent chromium [Cr(VI)] particulates. Site-specific soil alternative remediation standards (ARSs) are set using soil suspension and dispersion models to be protective of the theoretical excess cancer risk associated with inhalation of soil suspended by vehicle traffic and wind. The purpose of this study was to update,Removal of Hexavalent Chromium from a Contaminated Soil by,,contamination of soils exist in numerous sites as a result of depositing chromite ore processing residue. Electroremediation is well suited for the removal of hexavalent chromium from soils in situ. This thesis studies the removal of hexavalent chromium from a contaminated soil by electromigration. In an experiment at pH 13 using a sodium hydroxide purging solution, a 95 % removal of,
