chromium ore processing residue

chromite processing small factory pdf

Conversion of Chromium Ore Processing Residue to Chrome Steel. 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.

US8192705B2 - 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 ...

processing of chromium ore - pizzeria-finaleligure

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.

Jersey City Chromium Cleanup — Site History

Approximately 40% of the material produced at the processing plant was used to support U.S. military operations during World War II. From the early 1900s to 1954, the Mutual Chemical Company used Site 441 Route 440 to dispose of a manufacturing by-product called "Chrome Ore Processing Residue" or "COPR" (pronounced "ko-per").

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 dumpsite showed a maximum total Cr ...

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 .

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 (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.

(PDF) Chromite Ore Processing Residue in Hudson County ...

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 ...

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).

Remediation of chromite ore processing residue using ...

Sep 18, 2014· Disposal of Chromite Ore Processing Residue (COPR) is a major concern from an environmental point of view because it consists mainly of Cr(VI) in addition to Cr(III). Cr(VI) is more soluble and mobile when compared to Cr(III). The study primarily concentrated on treatment of COPR using solidification and stabilization (S/S) process.

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]

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 (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.

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

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 ...

Speciation and Recovery of Chromium From Chromite Ore ...

Chromium contained in contaminated soils and solid wastes can be categorized as exchangeable, oxidizable, carbonate-bound, reducible and residual. The results from this study indicate a need for efficient leaching methodologies in chromite ore processing plants to decrease the non-detrital fractions of chromium in the residue.

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,

chromite ore processing plant in finland

Chromium Cleanup Partnership. PPG ceases production at the Garfield Avenue plant because the company is constructing a new chromite ore processing facility with more advanced technology in Texas. 1964 PPG sells the Garfield Avenue plant. For many years prior to 1963, chromite ore processing residue was used as fill in construction projects ...

(PDF) Chromite Ore Processing Residue in Hudson County ...

Jun 01, 1991· 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 .

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

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 are likely associated with other fill soils used at the site.

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. In the column biotreatment process, P. phragmitetus BB can reduce Cr(VI) in the .

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 .

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

Apr 26, 2012· Diagenesis of Buried Chrome Ore Processing Residue GeoCongress 2008: Geotechnics of Waste Management and Remediation June 2012 The Assessment and Remediation of Chromite Ore Processing Residue at Former Disposal Sites, Glasgow, Scotland: Current Status (2007)

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

Jun 18, 2003· 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 .