chromium ore processing residue

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

Chromite ore processing residue COPR which contains hexavalent chromium Cr 6 at concentrations typically in the range of thousands of milligramskilograms 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 weatheringinduced mineralogical expansion has been observed at the site over time

For many years prior to 1963 chromite ore processing residue was used as fill in construction projects 1976 Chromite ore processing in Hudson County ends During its lifetime Hudson Countys chrome industry generated approximately 2 million tons of residue which was later determined to be a hazardous material 1982

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

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

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

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 CrVI to trivalent chromium CrIII in slurry form and pH adjustment to precipitate CrIII as chromium hydroxide

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 PhD DSRT A report was prepared in 2005 with the findings of the workgroup see link below

Millions of tons of chromiteore processing residue have been used as fill in various locations in Northern New Jersey and elsewhere in the United States The primary toxicants in the residue are trivalent chromium CrIII and hexavalent chromium CrVI The hazard posed by CrIII is negligible due to its low acute and chronic toxicity

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

Stabilization of chromium ore processing residue COPR · 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

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

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

RECOVERY OF Cr FROM CHROMITE ORE PROCESSING RESIDUES 2449 I 20 COPRH20 2 at 60°C for 30 min The concentration of chromium leached out after the treatment was determined Oxidative treatmentOxidation of chromiumIII in the COPR 08 mm particle size to chromiumVI was can·ied out by employing various oxidants like

Chromite ore processing residues COPR is the source of the CrVI contamination in the environment Pannonibacter phragmitetus BB was used to treat two different types of COPRs in this research

Chromite Ore Processing Residue COPR is a solid waste generated during the high temperature ∼1200 °C roasting process that is used to extract chromium from chromite ore Antony et al 2006 Limebased roasting has been the prevalent method to complex other metals in

Methods to reduce hexavalent chromium CrVI 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 contained in contaminated soils and solid wastes can be categorized as exchangeable oxidizable carbonatebound reducible and residual The results from this study indicate a need for efficient leaching methodologies in chromite ore processing plants to decrease the nondetrital fractions of chromium in the residue Aggressive

The treated water is filtered and the chromium rich precipitates are properly disposed of Available in situ technologies or treatment approaches for chromate contamination use chemical reduction and fixation for remediation eg geochemical fixation permeable reactive barriers PRBs and reactive zones

Apr 26 2012 · 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 environment as well as the human health

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

GB2409676B GB0508307A GB0508307A GB2409676B GB 2409676 B GB2409676 B GB 2409676B GB 0508307 A GB0508307 A GB 0508307A GB 0508307 A GB0508307 A GB 0508307A GB 2409676 B GB2409676 B GB 2409676B Authority GB United Kingdom Prior art keywords chromium iron process ore processing processing residue Prior art date 20021030 Legal status The legal status is an

What is the abbreviation for Chromite Ore Processing Residue What does COPR stand for COPR abbreviation stands for Chromite Ore Processing Residue