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 concentrations greater than 10,000 mg/kg, with hexavalent content ranging from about 1 to 50%. Continuing leaching …

Conversion of Chromium Ore Processing Residue to Chrome Steel. GeoCongress 2008: Geotechnics of Waste Management and Remediation June 2012 . Diagenesis of Buried Chrome Ore Processing Residue. GeoCongress 2008: Geotechnics …

Abstract. 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 ...

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). Here we provide direct evidence of this …

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 ...

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.

Chromite ore processing residue (COPR), derived from the so-called high lime processing of chromite ore, contains high levels of Cr(III) and Cr(VI) and has a pH between 11 and 12. Ferrous sulfate, which is used for remediation of Cr(VI) contamination in wastewater and soils via reduction to Cr(III) and subsequent precipitation of iron(III)/chromium(III) hydroxide, has also been …

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 ...

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 …

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 ...

Abstract 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.

It has been shown that EPA Method 3060A does not adequately extract Cr(VI) from chromium ore processing residue (COPR). We modified various parameters of EPA 3060A toward understanding the transformation of COPR minerals in the alkaline extraction and improving extraction of Cr(VI) from NIST SRM 2701, a standard COPR-contaminated soil. Aluminum and Si were the major elements dissolved …

The present invention relates to a process for simultaneous recovery of chromium and iron from Chromite Ore Processing Residue (COPR) and more particularly, the present invention relates to an economical and environment-friendly process for recovering chromium as a chromate salt and iron as an iron salt from non-leachable Chromite Ore Processing Residue and avoids landfilling of toxic metals.

A process for stabilizing chromium in a chromite ore processing residue (COPR) comprises the steps of adding an acid to consume the excess alkalinity of the COPR, resulting in a pH of less than 10; and adding a chemical reductant to the COPR to convert any …

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 ...

Chromium Ore Processing Residue. May 01 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 CrVI ions ...

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 ...

Laboratory batch experiments were conducted on heavily contaminated groundwater and chromium ore processing residue (COPR) samples to determine the rate and extent of hexavalent chromium [Cr(VI)] reduction and immobilization by nanoscale iron particles. Laboratory synthesized nanoscale iron particle …

bility implications of bridges constructed in chromite ore processing residue (COPR) fill. The findings are based on visual inspection and various testing of 31 bridges, located in known chromium and nonchromium sites in and around Hudson County, New Jersey. Various

1.Introduction. Chromite ore processing residue (COPR) is an industrial solid waste .It has been reported that 2–3 t of COPR is generated in the production of 1 t chromic salts .Accumulation of COPR takes up considerable land, and when the leached hexavalent chromium flows into the water after rainfall, it pollutes the water and the soil and harms human health,,, .

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). A report was prepared in 2005 with the findings of the workgroup (see link below).

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 .

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 (Cr 6+ ) from the waste residue has become a major problem for the chromium chemical industry.

Stabilization of chromium ore processing residue (COPR) with nanoscale iron particles. Journal of Hazardous Materials, 2006. Jiasheng Cao. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 35 Full PDFs related to this paper. Read Paper. Download PDF.

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,

sequently, chromium contaminant in groundwater, chromium ore processing residue (COPR), and sediment represents a sig-nificant environmental and public health concern [9]. The U.S. EPA maximum contaminant level (MCL) for total chromium in water is 0.1mg/L [10]. Chromium in natural waters exists primarily in +3 and +6 valence states [11].

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 ...

Stabilization of chromium ore processing residue (COPR) with nanoscale iron particles J Hazard Mater. 2006 May 20;132(2-3):213-9. doi: 10.1016/j.jhazmat.2005.09.008. Epub 2006 Apr 18. Authors Jiasheng Cao 1, Wei-Xian Zhang. Affiliation 1 Department of Civil and Environmental ...

Chromite ore processing residue (COPR) is a hazardous waste derived from the chromate extraction roasting process. Despite its (eco)toxicological potential, COPR has been dumped in uncontrolled surface landfills in several countries. The leaching of Cr(VI), resulting in the contamination of groundwater, is a key environmental risk arising from these CORR dumps.

Area 1501/1602 is a 17-acre area that was filled with Chromium Ore Processing Residue (COPR). The area was constructed with a perimeter clay dike, underlying clay liner and covered or capped with asphalt pavement and additional material on top. Currently the area is used by the Maryland Port Administration to store cargo.

The prevalent method of processing chromite for use in the stainless steel ... Author: Eddie Martin (Minerals engineer) Publisher: ISBN: STANFORD:36105006337260. ... (2007) - Conversion of chromium ore processing residue to chrome steel. Author: Antonio Gianfagna. Publisher: Edizioni Nuova Cultura. ISBN: 9788868123901. Category: Reference. Page ...