Chromium Ore Processing Residue Maryland
20/05/2009 Chromium Ore Processing Residue (COPR) Site Initiative Background and Site Location 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
Stabilization 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
COPR (left over Chromium Ore Processing Residue) leaving un-oxidized trivalent chromium and slow-dissolving hexavalent chromium compounds [Burke et al., 1991]. In the absence of information on the toxicity of hexavalent chromium, COPR was subsequently used for the back-filling of demolition sites, preparation for building foundations, construction of tank berms, roadway construction, the
Chromite ore processing residue in Hudson County, New
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 in Hudson County, New Jersey
Chromite ore processing residue occurs at over 130 sites in Hudson County, New Jersey. Many of these sites are in urban residential areas. This waste is a result of 70 years of chromate and bichromate chemical manufacturing. At least 15% of the sites contain total chromium concen-trations greater than 10,000 mg/kg, with hexavalent content ranging from about 1 to 50%. Continuing leaching of
Chromium Ore Processing Residue Maryland
20/05/2009 Chromium Ore Processing Residue (COPR) Site Initiative Background and Site Location 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
Conversion of Chromium Ore Processing Residue to Chrome Steel
COPR (left over Chromium Ore Processing Residue) leaving un-oxidized trivalent chromium and slow-dissolving hexavalent chromium compounds [Burke et al., 1991]. In the absence of information on the toxicity of hexavalent chromium, COPR was subsequently used for the back-filling of demolition sites, preparation for building foundations, construction of tank berms, roadway construction, the
Chromite ore processing residue in Hudson County, New
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.
Assessment of the human health risks posed by exposure to
Millions of tons of chromite-ore processing residue have been used as fill in various locations in northern New Jersey and elsewhere in the United States. The primary toxicants in the residue are trivalent chromium [Cr(III)] and hexavalent chromium [Cr(VI)]. The hazard posed by Cr(III) is negligible due to its low acute and chronic toxicity. In contrast, Cr(VI) is a human carcinogen following
Chromium Ore Processing Residue
Chromium (Cr) contamination of natural resources from unregulated disposal of pretanning industrial waste, chromite ore processing residue (COPR), is a serious environmental concern, especially in developing countries. Although there have been studies on COPR characterization, the fate and transport of chromium emanating from COPR remains poorly understood. In this study, processes governing
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. Multiple complementary analysis methods including leaching tests, X-ray powder diffraction, X-ray
Long-Term Leaching Behavior of Chromite Ore Processing
03/07/2021 Leaching characteristics of chromium ore processing residue (COPR) for the long term (simulating a 20-year leaching scenario) were investigated using laboratory flow-through column testing with synthetic rainwater and groundwater for 250 pore volumes of flow (PVFs). Four saturated column experiments simulated the long-term leaching of chromium (Cr) from two types of COPR
Biotreatment of chromite ore processing residue by
26/02/2013 Chromite ore processing residue (COPR) is produced by the high lime process where the chromite ore is roasted at very high temperatures to oxidize the chromium from trivalent to hexavalent state (Wazne et al. 2008; Tinjum et al. 2008).Although the production of COPR has been abandoned in some developed countries, the process is still being used in many developing countries, such as
(PDF) Chromite Ore Processing Residue in Hudson County
Chromite ore processing residue occurs at over 130 sites in Hudson County, New Jersey. Many of these sites are in urban residential areas. This waste is a result of 70 years of chromate and
Remediation of hexavalent chromium contamination in
01/05/2017 1. Introduction. 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).One of the biggest threats of COPR to the environment is the release of hexavalent chromium (Cr(VI)) ions, which are highly mobile and
Chromium Ore Processing Residue Maryland
20/05/2009 Chromium Ore Processing Residue (COPR) Site Initiative Background and Site Location 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
Stabilization of chromium ore processing residue (COPR
Stabilization of chromium ore processing residue (COPR) chromium [Cr(III)] is relatively stable and has low solubility (<10−5 M) in aqueous solutions over a wide pH value range (4–12) [11]. Stable ionic forms of Cr(III) in aqueous systems include Cr(OH)2+ and Cr(OH)2 + [11]. Remediation of chromium-contaminated soil and groundwa- ter has largely followed the pathway of reduction and
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 site
Chromite ore processing residue in Hudson County, New
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.
Chromium Ore Processing Residue
Chromium (Cr) contamination of natural resources from unregulated disposal of pretanning industrial waste, chromite ore processing residue (COPR), is a serious environmental concern, especially in developing countries. Although there have been studies on COPR characterization, the fate and transport of chromium emanating from COPR remains poorly understood. In this study, processes governing
Biotreatment of chromite ore processing residue by
26/02/2013 Chromite ore processing residue (COPR) is produced by the high lime process where the chromite ore is roasted at very high temperatures to oxidize the chromium from trivalent to hexavalent state (Wazne et al. 2008; Tinjum et al. 2008).Although the production of COPR has been abandoned in some developed countries, the process is still being used in many developing countries, such as
Review of Chromite Ore Processing Residue (COPR): Past
Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high levels of hexavalent chromium (Cr[VI]). Although the high temperature chromite process was banned in several countries, its legacy still exists at numerous contaminated sites. For instance, New Jersey alone has over 2 million tons of waste COPR. Legacy sites are confounded by the fact that a
Long-Term Leaching Behavior of Chromite Ore Processing
03/07/2021 Leaching characteristics of chromium ore processing residue (COPR) for the long term (simulating a 20-year leaching scenario) were investigated using laboratory flow-through column testing with synthetic rainwater and groundwater for 250 pore volumes of flow (PVFs). Four saturated column experiments simulated the long-term leaching of chromium (Cr) from two types of COPR
chromium ore processing residue
Conversion of Chromium Ore Processing Residue to Chrome . During the chromate extraction process, varying amounts of lime and soda ash were added and roasted with pulverized chromite ore to a temperature between 1100ºC and 1150ºC under an oxidizing environment Trivalent chromium in chromite ore was oxidized to hexavalent chromium The highly soluble hexavalent chromium was
Leaching Mechanism of Cr(VI) from Chromite Ore Processing
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
