Background

chromium ore processing residue

Chromium Remediation or Release? Effect of Iron(II ...

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, …

Stabilization of chromium ore processing residue (COPR ...

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.

Chrome Steel from Chromium Ore Processing Residue | Geo ...

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 of Waste Management and Remediation June 2012 .

NIST - SRM Order Request System SRM 2700 - Hexavalent ...

soil, 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) ...

EIG Webinar: David Cragg - Chromium Ore Processing …

Extractive Industry Geology (EIG) webinar on 'Chromium Ore Processing Residue: Tackling a legacy of land contamination in East Glasgow' by David Cragg from A...

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. …

Chromium steel from chromite ore processing residue — A ...

Burke T, Fagliano J, Goldoft M, Hazen R E, Tglewicz R, Mckee T. Chromite ore processing residue in Hudson County, New Jersey. Environmental Health Perspectives, 1991, 92(5): 131–137. Article CAS Google Scholar 3. Kamolpornwijit W. Feasibility study to extract iron and chromium from chromium contaminated soils.

Conversion of chromium ore processing residue to chrome ...

Conversion of chromium ore processing residue to chrome steel Jay N. Meegoda, Wiwat Kamolpornwijit, Zhengbo Hu, Robert Mueller, Ravi Patraju Civil and Environmental Engineering

Airborne Concentrations of Trivalent and Hexavalent ...

chromite ore processing residue were deposited in these areas.6 This residue is the material that remains after the ore has been roasted in a kiln and treated in other processes to remove the majority of the chromium from the ore and to produce chromates. The residue is grey or rust in color and has a density of about 1.5 tons per cubic yard ...

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) …

US7670576B2 - 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 …

Chromium Workgroup Full Report - Government of New …

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 ...

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). Here we provide …

Conversion of Chromium Ore Processing Residue to …

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 ...

Specific Gravity of Expansive Chromium Ore Processing ...

Chromium ore processing residue (COPR) is a waste byproduct. from the industrial processing of chromite ore for the isolation and. extraction of soluble chromate salts. Refining operations in the.

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.

A new method for the treatment of chromite ore processing ...

Using human sweat to extract chromium from chromite ore processing residue: applications to setting health-based cleanup levels. Horowitz SB, Finley BL. J Toxicol Environ Health, 40(4):585-599, 01 Dec 1993 Cited by: 6 articles | PMID: 8277520

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,

Chromium Ore Processing Residue-Jaw Crusher

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 crvi although the high temperature chromite process was banned in several countries its legacy still exists at numerous contaminated sites for instance new jersey ...

Chrome steel from chromium ore processing residue — New ...

Chrome steel from chromium ore processing residue. Wiwat Kamolpornwijit, Jay N ... Abstract. In Hudson County, New Jersey, there are more than two million tons of leftover chromite ore processing residues (COPR). ... The primary objective of this manuscript is to demonstrate an efficient and optimum way to recover chromium and iron from COPR in ...

Stabilization of chromium ore processing residue (COPR ...

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

US Patent Application for PROCESS FOR SOLUBILIZING ...

A process for reducing hexavalent chromium, Cr(VI), contained within a chromite ore processing residue matrix comprising the sequential steps of providing a chromite ore processing residue matrix containing Cr(VI), solubilizing the matrix to release Cr(VI), reducing the Cr(VI) to Cr(III) using Fe(II), and, fixing the residual Fe(II) using a effective amount of a …

Long-Term Leaching Behavior of Chromite Ore Processing ...

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).

Chemical and mineralogical characterization of chromite ...

Chromite ore processing residue (COPR) is a hazardous waste. Nevertheless, deposition of COPR in uncontrolled surface landfills is still common practice in some countries. Whereas old (between at least 40 and 180 years) COPR from the temperate zone has been intensively investigated, information on COPR in other regions is restricted.

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.

Laboratory data from testing parameters of EPA Method ...

It has been shown that Environmental Protection Agency (EPA) Method 3060A does not adequately extract Cr(VI) from solids containing chromium ore processing residue (COPR). We systematically modified parameters of EPA 3060A towards improving extraction efficiency of Cr(VI) from the National Institute of Standards and Technology (NIST) standard …

Adsorption Characteristics and Transport Behavior of Cr(VI ...

This study explored the stratigraphic distribution and soil/shallow aquifer characteristics surrounding a chromium ore processing residue (COPR) dumpsite at a former chemical factory in China. Total Cr levels in top soils (5–10 cm) nearby the COPR dumpsite were in the range of 8571.4–10711.4 mg/kg. Shallow aquifers (1–6 m) nearby the COPR …

[PDF] Chromite ore processing residue in Hudson County ...

The chemistry, environmental fate, health effects, and human exposure potentials for this waste are described. 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 …

Remediation of chromite ore processing residue by ...

1. Introduction. Chromite ore processing residue (COPR) is the solid residue produced by high lime process and classified as a hazardous waste for having 1–2% hexavalent chromium [Cr(VI)] (Kowalski and Gollinger-Tarajko, 2003).It is reported that 2–3 tons COPR is generated in the production of 1 ton sodium dichromate by the high lime process (Ding, 1994, …

Remediation of chromium-slag leakage with electricity ...

UK investigators estimated that approximately 2.5 million tons of chromite ore processing residue were found on several sites in the …

Remediation of chromite ore processing residue using ...

10%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 …

Chromium steel from chromite ore processing residue — …

10%The primary objective of this study is to demonstrate an efficient and optimum way to recover chromium and iron from chromite ore processing residues (COPR) for the production of chrome steel and stainless steel. In Hudson County, New Jersey, there are more than two million tons of leftover COPR.

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

Baltimore Chromium Residue Cleanup - Dundalk Marine Terminal

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.