chromium ore processing residue

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 The majority of chromium is present as Cr(III), partly as unreacted chromite, but Cr(VI) contents ranging from 1 to 30% of total Cr have been reported (4,8 9). These two 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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Apr 03, 2020soil, hexavalent chromium, chromite ore processing residue, environmental contamination, iron, manganese - Certificate - MSDS - Table Add Material to Cart Certificate Material Safety Data Sheet (MSDS) Related Materials: 106.1 - Metal (Inorganics) Constituents in Natural Matrices (liquid and solid forms)

Jul 01, 2006Past 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

Batch leaching tests, qualitative and quantitative x-ray powder diffraction (XRPD) analyses, and geochemical modeling were used to investigate the leaching mechanisms of Cr(VI) from chromite ore processing residue (COPR) samples obtained from an urban area in Hudson County, New Jersey. The pH of the leaching solutions was adjusted to cover a wide range between 1 and 12.5.

The most common shorthand of Chromium Ore Processing Residue is COPR. You can also look at abbreviations and acronyms with word COPR in term. Page Link; Citation Styles; Suggest New; Abbreviations or Slang with similar meaning. CR - Chromium; CP - Chromium Picolinate; CRPT - Chromium

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


Efficient extraction of slowly

1. Introduction Chromite ore processing residue (COPR), with its strong alkalinity, is a byproduct of the high-lime-based roasting chromate production process. 1 Huge amounts of COPR are discharged worldwide each year, especially in China. China is the largest producer and consumer of chromium salt, and the total amount of COPR is estimated to be more than 6 million tons, increasing by nearly

The chromite ore processing residue (COPR) is actually a cement contaminated with hexavalent chromium typically at 0.1-1 wt%. It is difficult to treat, especially from silicaceous ores. Even with pH reduction, COPR treated with ferrous iron has resulted in soil and water contamination.

Abstract This study presents chemical, mineralogical, and leaching characterization of chromite ore processing residue (COPR) derived from the soda ash process, which is currently replacing the lime-based process in China, the world's largest chromite processor. Results indicated that, while soda ash COPR had 8,500 mg/kg Cr(VI), 90% of that was readily available in deionized water and thus the

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

COPR (left over Chromium Ore Processing Residue) leaving un-oxidized trivalent chromium . through two steps: FeCrO4 + 4C → Fe + 2Cr + 4 CO2 and C + Biotreatment of chromite ore processing residue by - ProQuest. Chromite ore processing residues (COPR) is the source of the Cr(VI) contamination in the

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).

potential impacts on human health of chromium at or from the site. Potential risks associated with other chromium ore processing residue (COPR) constituents—aluminum, calcium, iron, magnesium, manganese, and vanadium—were also evaluated (CH2M HILL, 2007b, 2008a). The scope of the HHRA is to evaluate potential current and future risks

Our Track Record - Treating Chromium VI We've had several enquiries recently from Clients who're dealing with Chromium VI and Chromium Ore Processing Residue (COPR) contaminated sites. Over the last 15 years we've developed considerable experience in the investigation, assessment and remediation of sites with these contaminants.

Green manufacturing process of chromium compounds

Nov 19, 2004In the process of carbonate leaching, the chromium‐containing residue after magnesium extraction can be used as iron ore or raw material in the cement industry . In addition, aluminum in chromite ore can be extracted and recovered in the green process

Conversion of Chromium Ore Processing Residue to Chrome 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. Get Price

Reclamation of Chromite Ore Processing Residue (COPR) involving Recovery of Chromate Salt, Detoxification and the world, but also COPR has been still generated (9). Hexavalent chromium (Cr (VI)) was released to the followed by recirculating the barren liquid to the leaching process and recovering the chromium in chromate form.

Specific gravity tests were performed on chromium ore processing residue (COPR), an expansive industrial byproduct of the historical processing of chromite ore, to determine if the complexity and heterogeneity of the particle microstructure may cause erroneous specific gravity results using ASTM D854-06 Method B as the baseline procedure.

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

chromium ore processing flowsheet Coal Surface Mining. chromium ore processing flowsheet Description The Development of Chrome and Nickel Projects in Mintek 5. Chromite ore processing residue occurs at over 130 sites in Hudson County, New Jersey. Chat Free. Green metallurgical processing of chromite - ScienceDirect

The most common shorthand of Chromium Ore Processing Residue is COPR. You can also look at abbreviations and acronyms with word COPR in term. Page Link; Citation Styles; Suggest New; Abbreviations or Slang with similar meaning. CR - Chromium; CP - Chromium Picolinate; CRPT - Chromium

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 (Na2S2O4) was used to reduce Cr(VI) to Cr(III) in COPR containing high available Fe, and then sodium phosphate (Na3PO4)

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 for the back-

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