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Conversion of Chromium Ore Processing Residue to Chrome

to hexavalent chromium. The highly soluble hexavalent chromium was then removed from the 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

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Stabilization of chromium ore processing residue (COPR

May 20, 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 .

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Chromium Ore Processing Residue mde.state.md.us

May 20, 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

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(PDF) A Review of Chromite Ore Processing Residue (COPR

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

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Leaching of hexavalent chromium from young chromite ore

3.4 Extractable chromate and chromium oxidation state in the chromite ore processing residue solid phase. Table 2 summarizes the extractable amounts of CrO 4 2− and the ratio of Cr(VI)/Cr total in the COPR as determined by X‐ray absorption near edge structure (XANES) spectroscopy (Supplemental Figures S5 and S6).

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Microstructural analyses of Cr(VI) speciation in chromite

Jul 05, 2020· Chromite Ore Processing Residue (COPR) is a solid waste generated during the high temperature (∼1200 °C) roasting process that is used to extract chromium from chromite ore (Antony et al., 2006). Lime-based roasting has been the prevalent method to complex other metals in ore (Fe, Mg, Al) and isolate Cr.

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Extraction of Cr(VI) from chromite ore processing residue

Jul 01, 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. Characteristic analysis showed that Cr(VI) was mainly incorporated in the hydrocalumite (NaCa 4 Al 2 O 6 (SO 4 /CrO 4) 1.5

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Cellulose Mediated Reduction and Immobilization of Cr(VI

Jul 15, 2020· As the byproduct, millions of tons of chromite ore processing residue (COPR) were formed and discharged in the process. COPR normally contains a significant amount of leachable chromium and thus leads to a severe environment threat (Jing et al., 2017; Kanchinadham et al., 2013; Wang et al., 2007).

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New Jersey Department of Environmental Protection Chromium

Conversion of Chromium Ore Processing Residue to Chrome Steel (December 2007) Full Report; This was done in response to concerns voiced by the Hudson County community where most of the chrome ore processing residue waste sites are located. An internal DEP workgroup was formed and chaired by Eileen Murphy, Ph.D. (DSRT).

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Calcium polysulfide remediation of hexavalent chromium

Jul 01, 2006· Past disposal of high-lime chromite ore processing residue (COPR) from a chemical works in S.E. Glasgow, UK, has led to continuing release of toxic and carcinogenic hexavalent chromium (Cr(VI)) to groundwaters which are highly contaminated with Cr(VI)O 4 2−.Traditional methods of remediating Cr(VI)-contaminated land, e.g. using ferrous sulfate and organic matter, have had limited

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Chromite Ore Processing Residue (COPR): Hazardous

Mar 31, 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

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(PDF) A Review of Chromite Ore Processing Residue (COPR

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

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Processes Governing Chromium Contamination of Groundwater

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

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Leaching of hexavalent chromium from young chromite ore

3.4 Extractable chromate and chromium oxidation state in the chromite ore processing residue solid phase. Table 2 summarizes the extractable amounts of CrO 4 2− and the ratio of Cr(VI)/Cr total in the COPR as determined by X‐ray absorption near edge structure (XANES) spectroscopy (Supplemental Figures S5 and S6).

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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,

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US7645092B2 Treatment of in ground chromium ore

In methods for treatment of in ground chromium ore processing residue contamination, ferrous sulfide is provided as a substantially insoluble material in the residue deposit. The ferrous sulfide accordingly may remain substantially in place, in the pores of the soil or residue, even over long periods of time, regardless of underground water movement or diffusion.

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Leaching of Valuable Elements from the Waste Chromite Ore

chromite ore processing residue (COPR) is an inevitable solid emission in chromite salt production. It is an industrial waste produced during the extraction of Cr(VI) from a chromite ore using the high-temperature roasting process.11 In general, the COPR is alkaline (pH > 12),5 ,7 and because of the presence of partially water-soluble

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Different Pathways for Cr(III) Oxidation: Implications for

Hexavalent chromium contamination is a global environmental issue and usually reoccurs in alkaline reduced chromite ore processing residues (rCOPR). The oxidation of Cr(III) solids in rCOPR is one possible cause but as yet little studied. Herein, we investigated the oxidation of Cr(OH)3, a typical species of Cr(III) in rCOPR, at alkaline pH (9–11) with δ-MnO2 under oxic/anoxic conditions

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WO2006031590A1 Methods of treatment of chromite ore

Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of the following steps: contacting the chromite processing wastes with an oxygen scavenger or chemical reducer; permitting the chromite processing wastes to react with the oxygen scavenger or chemical reducer; contacting the chromite processing wastes with ferrous ion; contacting the chromite

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Baltimore Chromium Residue Cleanup Dundalk Marine Terminal

Chromium processing at the former Baltimore Works plant in the Inner Harbor produced chromium ore processing residue (COPR). COPR from the Baltimore site was used as a fill material in certain areas around the harbor, primarily at the Dundalk Marine Terminal.

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Jersey City Chromium Cleanup — On-site Work

From the 1900s until the 1970s, a chrome manufacturing by-product called chrome ore processing residue was used as fill in parts of Jersey City, including the Route 440 properties. The remediation also addressed non-chromium contaminants, primarily lead, that

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Chromium Cleanup Partnership

For many years prior to 1963, chromite ore processing residue was used as fill in construction projects. 1976 Chromite ore processing in Hudson County ends. During its lifetime, Hudson County's chrome industry generated approximately 2 million tons of residue, which was later determined to be a hazardous material. 1982

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Extraction of Chromium from Chromite Ore

Table of ContentsOre SamplesChromite Ore ProcessingShaker Table Concentration of Dry Crushed OreChromium Ore MetallurgyConclusions Chromium has a wide variety of applications in the modern world. Its major uses are in stainless steels and the plating of metals. Other important uses include alloy steel, heating elements, pigments, leather processing, catalysts, and refractories. Of the chromite

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US8192705B2 Methods of treatment of chromite ore

ore processing processing residue chromite ore copr contacting Prior art date 2006-10-16 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active, expires 2026-11-03 Application number US12/634,728 Other

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Processes Governing Chromium Contamination of Groundwater

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

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Distribution characteristics of minerals and elements in

Jan 10, 2012· In this paper, environmental scanning electron microscopy (ESEM) is applied to characterizing the mineral and element distribution of chromite ore processing residue (COPR). The test results show that Cr-bearing brownmillerite occurs in the rim of COPR particle, while hydroandradite with Cr(VI) in its structure presents inside the COPR particle.

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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

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US7645092B2 Treatment of in ground chromium ore

In methods for treatment of in ground chromium ore processing residue contamination, ferrous sulfide is provided as a substantially insoluble material in the residue deposit. The ferrous sulfide accordingly may remain substantially in place, in the pores of the soil or residue, even over long periods of time, regardless of underground water movement or diffusion.

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WO2006031590A1 Methods of treatment of chromite ore

Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of the following steps: contacting the chromite processing wastes with an oxygen scavenger or chemical reducer; permitting the chromite processing wastes to react with the oxygen scavenger or chemical reducer; contacting the chromite processing wastes with ferrous ion; contacting the chromite

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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

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Some studies on recovery of chromium from chromite ore

in chromite ore and as chromium iron c xide (FeCr04). In this form, chromium is inert. It is not bio-available on account of poor solubility. Dressing ~of chromium involves the oxidation of chromiu (Ill) into chromium(VI{ Major chemi~al reaction.- asso_ciated with the processing of chrom1te ore

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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,

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Remediation of chromite ore processing residue using

Sep 18, 2014· Yunyi Li, Andrew B. Cundy, Jingxuan Feng, Hang Fu, Xiaojing Wang, Yangsheng Liu, Remediation of hexavalent chromium contamination in chromite ore processing residue by sodium dithionite and sodium phosphate addition and its mechanism, Journal of Environmental Management, 10.1016/j.jenvman.2017.01.031, 192, (100-106), (2017).

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CLU-IN Contaminants > Chromium VI > Treatment Technologies

Calcium polysulfide remediation of hexavalent chromium contamination from chromite ore processing residue (Abstract) Margaret C. Graham, John G. Farmer, Peter Anderson, Edward Paterson, Stephen Hillier, David G. Lumsdon and Richard J.F. Bewley Science of The Total Environment, Volume 364, Issues 1-3, 1 July 2006, Pages 32-44

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Honeywell agrees to settle Jersey City chromium lawsuit

Jun 10, 2015· The chromium sites are properties along Route 440 where chromium chemical products were made and chromium ore processing residue was disposed between about 1895 and 1954.

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Chromite Ore Processing Residue (COPR): Hazardous

Mar 31, 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

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US8192705B2 Methods of treatment of chromite ore

ore processing processing residue chromite ore copr contacting Prior art date 2006-10-16 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active, expires 2026-11-03 Application number US12/634,728 Other

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Chromite Ore Processing Residue in Hudson County, New

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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Chromite Ore Processing Residue (COPR): Hazardous

Mar 31, 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

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Chromite Ore Processing Residue in Hudson County, New

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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Hydrogarnet: A Host Phase for Cr(VI) in Chromite Ore

For understanding both the environmental behavior and developing remediation treatments for chromium ore processing residue (COPR) it is important to identify all the potentially soluble sources of Cr(VI). Hydrogarnet has been identified as a major phase in COPR and it has been previously speculated that it has a capacity to host Cr(VI).

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Biotreatment of chromite ore processing residue by

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.

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Treatment of in ground chromium ore processing residue

In methods for treatment of in ground chromium ore processing residue contamination, ferrous sulfide is provided as a substantially insoluble material in the residue deposit. The ferrous sulfide accordingly may remain substantially in place, in the pores of the soil or residue, even over long periods of time, regardless of underground water

Get Quote

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.

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Different Pathways for Cr(III) Oxidation: Implications for

Chromium steel from chromite ore processing residue — A valuable construction material from a waste June 2011 · Frontiers of Environmental Science & Engineering in China Jay N. Meegoda

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Leaching mechanisms of Cr(VI) from chromite ore processing

Oct 23, 2008· Leaching mechanisms of Cr(VI) from chromite ore processing residue. Wazne M(1), Jagupilla SC, Moon DH, Christodoulatos C, Koutsospyros A. Author information: (1)Center for Environmental Systems, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, NJ 07030, USA. [email protected]

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CHAPTER 1 EXECUTIVE SUMMARY New Jersey

apply to chromium ore processing residue (COPR) waste sites in New Jersey. The request emanated from concerns raised to the Commissioner by the Hudson County community where most of the chrome ore processing residue waste sites are located. The workgroup was comprised of experts from various programs of the Department, one representative from the NJ

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Extraction of Chromium from Chromite Ore

Table of ContentsOre SamplesChromite Ore ProcessingShaker Table Concentration of Dry Crushed OreChromium Ore MetallurgyConclusions Chromium has a wide variety of applications in the modern world. Its major uses are in stainless steels and the plating of metals. Other important uses include alloy steel, heating elements, pigments, leather processing, catalysts, and refractories. Of the chromite

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Remediation of chromite ore processing residue using

James, B.R., 1994, Hexavalent chromium solubility and reduction in alkaline soils enriched with chromite ore processing residue. Journal of Environmental Quality, 23, 227–233. CrossRef Google Scholar

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US20100286464A1 Methods of Treatment of Chromite Ore

Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of the following steps: contacting the chromite processing wastes with an oxygen scavenger or chemical reducer; permitting the chromite processing wastes to react with the oxygen scavenger or chemical reducer; contacting the chromite processing wastes with ferrous ion; contacting the chromite

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US7670576B2 Methods of treatment of chromite ore

ore processing processing residue Prior art date 2004-09-10 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active Reinstated, expires 2026-04-25 Application number US11/578,621 Other versions

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Richard Bewley, URS Corporation Ltd.

Treatment of Chromium Contamination and . Chromium Ore Processing Residue . Richard Bewle. y, URS Cor. poration Ltd. 1. INTRODUCTION . Chromium (Cr) is a heavy metal which has historically been used in a wide range of industrial applications including steel, pigments, wood preservatives, electroplating, metal finishing,

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