chromium ore processing residue

chromium ore processing - perkinspreschool.com

A Review of Chromite Ore Processing - ResearchGate. Aug 1, 2018 Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high levels of hexavalent chromium …

Conversion of Chromium Ore Processing Residue to …

In Hudson County, New Jersey, there are more than two million tons of leftover chromite ore processing residues (COPR). Part of COPR was used as construction fill materials spreading the problem to a larger area. High solubility of some chromate compounds along with their toxicity is threatening the

Modeling Chromium Dissolution and Leaching from …

Chromium has been widely used in many industrial applications. As a result of chromite ore processing, large amounts of chromite ore processing residue (COPR) material that can be classified as hazardous have been produced and released into the environment.

Evaluation of Bridges Constructed in Chromite Ore ...

Evaluation of Bridges Constructed in Chromite Ore Processing Residue RANDALL W. POSTON, A. RHE1: T ... 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 types of …

Chromium Cleanup Partnership

With ownership settled, PPG begins investigating the nature and extent of chromite ore processing residue contamination at the site. 2002 PPG reaches a voluntary agreement with the city to demolish the buildings at the Garfield Avenue site, making it easier for the company to determine the nature and extent of the chromite ore processing residue contamination.

US7670576B2 - Methods of treatment of chromite ore ...

A method to reduce hexavalent chromium (Cr(VI)) in chromite ore processing residue including combining at least one of ferrous sulfate heptahydrate and ferrous chloride with at least one of sodium hydrosulfide and calcium polysulfide to produce ferrous sulfide, and contacting the chromite ore processing residue with the ferrous sulfide to reduce Cr(VI) in the chromite ore processing residue.

Transport of hexavalent chromium in the vadose zone by ...

Column tests were conducted to evaluate the transport of Cr from underlying chromium ore processing residue (COPR) through the vadose zone in capped and uncapped scenarios and to determine if an asphalt cover system is a viable containment strategy.

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.

Electrokinetic removal of chromium from chromite ore ...

Chromite ore processing residue (COPR) contaminates farmland and groundwater around storage fields through the release of chromium leachate. Graphite particle-supported nanoscale zero-valent iron (GP-nZVI) synthesized by an impregnation-reduction pathway was used as a microelectrode in a three-dimensional electrochemical system to enhance the ...

Modifications to EPA Method 3060A to Improve Extraction …

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.

CHROMIUM ORE MINING PROCESS - YouTube

2016-12-20· 1 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 Ore Processing ...

chrome ore processing - mayurfilms.in

Effects of Chromite Ore-Processing Residue on Concrete Structures. chromite ore from the turn of the century until approximately 1971. A byproduct of the process was chromite ore-processing residue (COPR) that looks like and...

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

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.

Remediation of chromite ore processing residue using ...

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 chem-ically reduce hexavalent chromium [Cr(VI)] to trivalent chro-mium [Cr(III)] in slurry form and pH adjustment to precipitate Cr(III) as chromium hydroxide. The present study investigates the ...

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 sites contain total chromium concentrations greater

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 sites contain total chromium concentrations greater

Chromium Ore Processing Residue - mde.state.md.us

1800 Washington Boulevard | Baltimore, MD 21230-1718 | 410-537-3000 | 800-633-6101 | TTY Users: 800-735-2258 In 1976 Allied began to investigate alternative disposal sites and innovative uses of the material.

Baltimore Chromium Residue Cleanup - Dundalk Marine …

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.

Chrome Steel from Chromium Ore Processing Residue | …

In Hudson County, New Jersey, there are more than two million tons of leftover chromite ore processing residues (COPR). Part of COPR was used as construction fill materials spreading the problem to a larger area. High solubility of some chromate compounds along with their toxicity is threatening the