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Chromite Ore Processing Residue (COPR): Hazardous ...

Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr6+) 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

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Chromite 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-soluble

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Immobilization of chromite ore processing residue with ...

01/06/2016  Chromite ore processing residue (COPR) is an industrial waste produced in the chromic salts production process and contains a small portion of leached Cr (VI), which is highly toxic and is listed as a hazardous waste. The immobilization of COPR using a blast furnace slag-based geopolymer has been investigated in this study.

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Detoxification and immobilization of chromite ore ...

05/01/2017  As a by-product of the extraction of chromium from chromite ores, chromite ore processing residue (COPR) is a major Cr-bearing waste and has become the main source of Cr pollution in the environment. After several decades of chromium extraction, the accumulated quantity of COPR is significant, especially in some developing countries. For example, the total amount of COPR

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Long-term treatment issues with chromite ore processing ...

17/05/2007  Alkaline (pH > 12) chromite ore processing residue (COPR) is derived from the roasting of chromite ore mixed with soda ash and slaked lime at ∼1200 °C to oxidize Cr 3+ and sequester impurities. The end products are soluble sodium chromate and the solid COPR that mainly consists of brownmillerite (Ca 2 FeAlO 5 ), periclase (MgO) and excess of hydrated lime (Ca(OH) 2 ) [1] .

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Particle size and pH effects on remediation of chromite ...

25/07/2008  About 1.5 million metric tons of alkaline (> pH 12) chromite ore processing residue (COPR) have been deposited over a span of 50 years as fill at various sites in Hudson County, NJ (Dermatas et al., 2006a). The COPR materials used throughout this study were obtained from a deposition site located in Hudson Country, NJ, USA. COPR materials are derived from the roasting process of chromite ore

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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 ).

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Extraction of Cr(VI) from chromite ore processing residue ...

01/07/2020  The effective extracting Cr(VI) from chromite ore processing residue (COPR) is the key to achieve COPR detoxification and recovery. We developed an effective method to extract Cr(VI) from COPR via controlling the phase transformation of Cr(VI)-containing minerals.

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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 soda

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Some studies on recovery of chromium from chromite ore ...

sodium chromate is termed as the chromite ore processing residue (COPR). Dressing of chromite ore is known to lead to the generation of 1 ton of treated mineral waste per ton of rated sodium chromate processed. Such a waste contains5 typically 5-10% Cr20 3. Landfill remains the most widely adopted disposal method employed worldwide. It has come to be recognized that disposal of such residues ...

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Characterization of chromite ore processing residue —

N2 - 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 ...

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Conversion of Chromium Ore Processing Residue to Chrome Steel

This report summarizes the characteristics of chromite ore processing residue (COPR) in terms of their chemical compositions and phases and results from the melting study to convert to iron with chromium or steel. The COPR from three hazardous waste sites in Jersey City, New Jersey, were analyzed using non-destructive instruments including scanning electron microscopes (SEM), x-ray diffraction ...

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Biotreatment of chromite ore processing residue by ...

26/02/2013  Chromite ore processing residues (COPR) is the source of the Cr(VI) contamination in the environment. Pannonibacter phragmitetus BB was used to treat two different types of COPRs in this research. The water-soluble Cr(VI) of COPR A and B is 3,982.9 and 1,181.4 mg/kg, respectively. In the column biotreatment process, P. phragmitetus BB can reduce Cr(VI) in the leachate to an

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Chromium Ore Processing Residue - Maryland

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 reports these ...

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Towards holistic technology solution to chromite ore ...

04/01/2021  Safe management and disposal of chromite ore processing residue (COPR) is an unsolved global problem. In spite of several global research efforts, the problem of safe management of COPR and redemption of dump sites has remained unsolved. There is a high risk for all living beings in and around the COPR dump sites due to prevailing significant amount of Cr(VI) content in the COPR.

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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 ...

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Leaching of hexavalent chromium from young chromite

18/03/2020  Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ores and is deposited in some countries in landfills. The objective of this study was to investigate the leaching characteristics of hexavalent Cr [Cr(VI)] from two COPR samples obtained from unlined landfills in the Kanpur area of northern India. Column experiments were conducted under

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Distribution characteristics of minerals and elements in ...

10/01/2012  Mineralogical characterization of chromite ore processing residue[C]. In: 2011 International Conference on Electric Technology and Civil Engineering. Lushan, China, 2011. [14] Hillier S, Roe M J, Geelhoed J S et al. Role of quantitative mineralogical analysis in the investigation of sites contaminated by chromite ore processing residue[J].

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AU2003272008A1 - A process for simultaneous recovery of ...

AU2003272008A1 - A process for simultaneous recovery of chromium and iron from chromite ore processing residue - Google Patents A process for simultaneous recovery of chromium and iron from chromite ore processing residue Download PDF Info Publication number AU2003272008A1 . AU2003272008A1 AU2003272008A AU2003272008A AU2003272008A1 AU 2003272008 A1

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Characterization of chromite ore processing residue —

N2 - 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 ...

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Chromium Ore Processing Residue - Maryland

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 reports these ...

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Remediation of chromite ore processing residue using ...

18/09/2014  Disposal of Chromite Ore Processing Residue (COPR) is a major concern from an environmental point of view because it consists mainly of Cr(VI) in addition to Cr(III). Cr(VI) is more soluble and mobile when compared to Cr(III). The study primarily concentrated on treatment of COPR using solidification and stabilization (S/S) process. Prior to the S/S process, there was a need for

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Role of quantitative mineralogical analysis in the ...

01/06/2003  Role of quantitative mineralogical analysis in the investigation of sites contaminated by chromite ore processing residue. Hillier S(1), Roe MJ, Geelhoed JS, Fraser AR, Farmer JG, Paterson E. Author information: (1)Macaulay Institute, Craigiebuckler, Aberdeen, AB15 8QH, Scotland, UK. [email protected] A range of techniques, normally associated with mineralogical studies of

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The soda-ash roasting of chromite ore processing

Sodium chromate is produced via the soda-ash roasting of chromite ore with sodium carbonate. After the reaction, nearly 15 pct of the chromium oxide remains unreacted and ends up in the waste stream, for landfills. In recent years, the concern over environmental pollution from hexavalent chromium (Cr6+) from the waste residue has become a major problem for the chromium chemical industry.

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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 ...

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Chromium speciation and fractionation in ground and ...

Chromium speciation and fractionation in ground and surface waters in the vicinity of chromite ore processing residue disposal sites. Farmer JG(1), Thomas RP, Graham MC, Geelhoed JS, Lumsdon DG, Paterson E. Author information: (1)Department of Chemistry, University of Edinburgh, UK. [email protected] Chromium concentrations of up to 91 mg l(-1) were found by ICP-OES for

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Chrome Steel from Chromium Ore Processing Residue

26/04/2012  Reductive Treatment of Chromite Ore Processing Residue (COPR): Lessons from a Field Study. GeoCongress 2008: Geotechnics of Waste Management and Remediation June 2012 . Field-Scale Evaluation of In-Situ and Ex-Situ Treatment Technologies for Chromite Ore Processing Residue (COPR) GeoCongress 2008: Geotechnics of Waste Management and Remediation June 2012 . Diagenesis of Buried Chrome Ore ...

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Distribution characteristics of minerals and elements in ...

10/01/2012  Mineralogical characterization of chromite ore processing residue[C]. In: 2011 International Conference on Electric Technology and Civil Engineering. Lushan, China, 2011. [14] Hillier S, Roe M J, Geelhoed J S et al. Role of quantitative mineralogical analysis in the investigation of sites contaminated by chromite ore processing residue[J].

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AU2003272008A1 - A process for simultaneous recovery of ...

AU2003272008A1 - A process for simultaneous recovery of chromium and iron from chromite ore processing residue - Google Patents A process for simultaneous recovery of chromium and iron from chromite ore processing residue Download PDF Info Publication number AU2003272008A1 . AU2003272008A1 AU2003272008A AU2003272008A AU2003272008A1 AU 2003272008 A1

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Chromite ore processing residue in hudson county, New ...

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 sities contain total chromium concentrations greater than 10,000 mg/kg, with hexavalent content ranging from about 1 to 50%. Continuing leaching of ...

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Chromium Ore Processing Residue - Maryland

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 reports these ...

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Characterization of chromite ore processing residue —

N2 - 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 ...

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Role of quantitative mineralogical analysis in the ...

01/06/2003  Role of quantitative mineralogical analysis in the investigation of sites contaminated by chromite ore processing residue. Hillier S(1), Roe MJ, Geelhoed JS, Fraser AR, Farmer JG, Paterson E. Author information: (1)Macaulay Institute, Craigiebuckler, Aberdeen, AB15 8QH, Scotland, UK. [email protected] A range of techniques, normally associated with mineralogical studies of

Get Quote

Remediation of chromite ore processing residue using ...

18/09/2014  Disposal of Chromite Ore Processing Residue (COPR) is a major concern from an environmental point of view because it consists mainly of Cr(VI) in addition to Cr(III). Cr(VI) is more soluble and mobile when compared to Cr(III). The study primarily concentrated on treatment of COPR using solidification and stabilization (S/S) process. Prior to the S/S process, there was a need for

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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 ...

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Chromium speciation and fractionation in ground and ...

Chromium speciation and fractionation in ground and surface waters in the vicinity of chromite ore processing residue disposal sites. Farmer JG(1), Thomas RP, Graham MC, Geelhoed JS, Lumsdon DG, Paterson E. Author information: (1)Department of Chemistry, University of Edinburgh, UK. [email protected] Chromium concentrations of up to 91 mg l(-1) were found by ICP-OES for

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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 ...

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AU2003272008A1 - A process for simultaneous recovery of ...

AU2003272008A1 - A process for simultaneous recovery of chromium and iron from chromite ore processing residue - Google Patents A process for simultaneous recovery of chromium and iron from chromite ore processing residue Download PDF Info Publication number AU2003272008A1 . AU2003272008A1 AU2003272008A AU2003272008A AU2003272008A1 AU 2003272008 A1

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Leaching of hexavalent chromium from young chromite ore ...

COPR, chromite ore processing residue(s); ICP–OES, inductively coupled plasma optical emission spectrometry; PV, pore volume(s); SEM, scanning electron microscopy; XANES, X-ray absorption near edge structure; XRD, X-ray powder diffraction. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution

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