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Leaching of Valuable Elements from the Waste Chromite Ore

chromite ore processing residue COPR is an inevitable solid emission in chromite salt production. It is an industrial waste produced during the extraction of Cr VI from a chromite ore using the hightemperature roasting process.11 In general, the COPR is alkaline pH gt 12 ,5 ,7 and because of the presence of partially watersoluble

Reduction and immobilization of chromate in chromite ore

Chromite ore processing residue COPR poses a great environmental and health risk with persistent Cr VI leaching. To reduce Cr VI and subsequently immobilize in the solid matrix, COPR was incubated with nanoscale zerovalent iron nZVI and the Cr VI speciation and leachability were studied.

Towards holistic technology solution to chromite ore

Safe management and disposal of chromite ore processing residue COPR is an unsolved global problem. In spite of several global research efforts, the problem of safe management of COPR and redemption of dump sites has remained unsolved. There is a high risk for all living beings in and around the COPR dump sites due to prevailing significant amount of Cr VI content in the COPR. The problem

WO2006031590A1 Methods of treatment of chromite ore

Methods of treatment of chromite ore processing residue Download PDF Info Publi ion number WO2006031590A1.

Chromite Ore Processing Residue COPR : Hazardous

Chromite ore processing residue COPR , which contains hexavalent chromium Cr6 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 weatheringinduced mineralogical

Efficient extraction of slowlyreleased Cr vi from nano

Residual unreacted Cr vi incorporated in ferroussulfatereduced chromite ore processing residue rCOPR can be slowly released during deposition, posing a significant threat to the environment. Recent studies indi e that such Cr vi mainly exists within the nanosized ion channels of ettringite, forming

PDF 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

Leaching of hexavalent chromium from young chromite ore

3.2 Chromite ore processing residue leaching behavior Figures 1 and 2 show the results of the COPR leaching as a function of the number of PV exchanged dimensionless time . Aqueous concentrations of Al, Cr III , Fe, Mg, and Si are not shown, since their concentrations were very low Fe, Mg, and Si were below the limit of determination by ICP

PDF Different Pathways for Cr III Oxidation: Impli ions

chromite ore processing residue rCOPR and impacts of environmental factors erosion on Cr VI leaching. J. Hazard. Mater. 2019, 373, 389

A clean and efficient leaching process for chromite ore

1. Introduction. China is the world leader in chromate salts production, manufacturing about 40 of the global chromate compounds since 2009 .Limebased roasting is the dominant chromate salts production technology in China, and a million tonnes of chromite ore processing residue COPR is produced each year.

Leaching of Valuable Elements from the Waste Chromite Ore

chromite ore processing residue COPR is an inevitable solid emission in chromite salt production. It is an industrial waste produced during the extraction of Cr VI from a chromite ore using the hightemperature roasting process.11 In general, the COPR is alkaline pH gt 12 ,5 ,7 and because of the presence of partially watersoluble

WO2006031590A1 Methods of treatment of chromite ore

Methods of treatment of chromite ore processing residue Download PDF Info Publi ion number WO2006031590A1.

Chromite Ore Processing Residue COPR : Hazardous

Chromite ore processing residue COPR , which contains hexavalent chromium Cr6 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 weatheringinduced mineralogical

Efficient extraction of slowlyreleased Cr vi from nano

Residual unreacted Cr vi incorporated in ferroussulfatereduced chromite ore processing residue rCOPR can be slowly released during deposition, posing a significant threat to the environment. Recent studies indi e that such Cr vi mainly exists within the nanosized ion channels of ettringite, forming

Improvement of a Cr VI Extraction Method for Chromite Ore

Chromite Ore Processing Residue COPR Chromite FeCr 2O 4 Chromite ore, CaO, and Na 2CO 3 are heated at 1100o C in a rotating kiln 4FeCr 2O 4 8Na 2CO 3 7O 2 8Na 2CrO 4 2Fe 2O 3 8CO 2 water leach Burke et al. 1991 Environmental Health Perspectives China India Japan Pakistan UK USA New Jersey Maryland High Lime Process

PDF 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

Microstructural Analyses of Cr VI Speciation in Chromite Ore

The speciation and distribution of Cr VI in the solid phase was investigated for two types of chromite ore processing residue COPR found at two deposition sites in the United States: grayblack GB granular and hard brown HB cemented COPR. COPR chemistry and mineralogy were investigated using microXray absorption spectroscopy and microXray diffraction, complemented by laboratory

A clean and efficient leaching process for chromite ore

1. Introduction. China is the world leader in chromate salts production, manufacturing about 40 of the global chromate compounds since 2009 .Limebased roasting is the dominant chromate salts production technology in China, and a million tonnes of chromite ore processing residue COPR is produced each year.

Methods of treatment of chromite ore processing residue

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

Cellulose Mediated Reduction and Immobilization of Cr VI in

It is a great challenge to find an effective method for the treatment of chromite ore processing residue COPR , due to the highly toxic and mobile characteristic of Cr VI in the sludge. This work reported a facile strategy to thoroughly reduce and immobilize Cr VI that was encapsulated in COPR by biomassassistant hydrothermal treatment. After hydrothermal treatment at 160 C for 180 min

Leaching of Valuable Elements from the Waste Chromite Ore

chromite ore processing residue COPR is an inevitable solid emission in chromite salt production. It is an industrial waste produced during the extraction of Cr VI from a chromite ore using the hightemperature roasting process.11 In general, the COPR is alkaline pH gt 12 ,5 ,7 and because of the presence of partially watersoluble

Efficient extraction of slowlyreleased Cr vi from nano

Residual unreacted Cr vi incorporated in ferroussulfatereduced chromite ore processing residue rCOPR can be slowly released during deposition, posing a significant threat to the environment. Recent studies indi e that such Cr vi mainly exists within the nanosized ion channels of ettringite, forming

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.

Improvement of a Cr VI Extraction Method for Chromite Ore

Chromite Ore Processing Residue COPR Chromite FeCr 2O 4 Chromite ore, CaO, and Na 2CO 3 are heated at 1100o C in a rotating kiln 4FeCr 2O 4 8Na 2CO 3 7O 2 8Na 2CrO 4 2Fe 2O 3 8CO 2 water leach Burke et al. 1991 Environmental Health Perspectives China India Japan Pakistan UK USA New Jersey Maryland High Lime Process

quotAn Investigation of the Geochemical Properties and Treatment

Chromite Ore Processing Residue COPR contains high concentrations of hexavalent chromium Cr VI , a human carcinogen, and is a hazardous waste that requires intensive treatment prior to disposal. China has banned the lime roasting process since 2013 and an alternative process using soda ash as roasting and complexing agent has replaced it in the larger factories. The process still produces

PDF 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

Microstructural Analyses of Cr VI Speciation in Chromite Ore

The speciation and distribution of Cr VI in the solid phase was investigated for two types of chromite ore processing residue COPR found at two deposition sites in the United States: grayblack GB granular and hard brown HB cemented COPR. COPR chemistry and mineralogy were investigated using microXray absorption spectroscopy and microXray diffraction, complemented by laboratory

Methods of treatment of chromite ore processing residue

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

Methods of Treatment of Chromite Ore Processing Residue

Justia Patents By Reduction, E.g., Hydrogenation epo/jpo US Patent Appli ion for Methods of Treatment of Chromite Ore Processing Residue Patent Appli ion Appli ion 20100286464

Cellulose Mediated Reduction and Immobilization of Cr VI in

It is a great challenge to find an effective method for the treatment of chromite ore processing residue COPR , due to the highly toxic and mobile characteristic of Cr VI in the sludge. This work reported a facile strategy to thoroughly reduce and immobilize Cr VI that was encapsulated in COPR by biomassassistant hydrothermal treatment. After hydrothermal treatment at 160 C for 180 min

Leaching of Valuable Elements from the Waste Chromite Ore

chromite ore processing residue COPR is an inevitable solid emission in chromite salt production. It is an industrial waste produced during the extraction of Cr VI from a chromite ore using the hightemperature roasting process.11 In general, the COPR is alkaline pH gt 12 ,5 ,7 and because of the presence of partially watersoluble

Chromium Ore Processing Residue Maryland

Chromium Ore Processing Residue COPR Site Initiative Background and Site Lo ion 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

Remediation of chromite ore processing residue using

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 solidifi ion and stabilization S/S process.

Chromite ore processing residue i preview and related info

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.

quotAn Investigation of the Geochemical Properties and Treatment

Chromite Ore Processing Residue COPR contains high concentrations of hexavalent chromium Cr VI , a human carcinogen, and is a hazardous waste that requires intensive treatment prior to disposal. China has banned the lime roasting process since 2013 and an alternative process using soda ash as roasting and complexing agent has replaced it in the larger factories. The process still produces

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.

Chromite Ore Processing Residue COPR : Hazardous

Chromite ore processing residue COPR , which contains hexavalent chromium Cr6 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 weatheringinduced mineralogical expansion has been observed at the site over time. The

Chromite Ore Processing Residue in Hudson County, New Jersey

Chromite Ore Processing Residue in Hudson County, New Jersey by Thomas Burke, Jerry Fagliano,t Marcia Goldoft,t Robert E. Hazen, Raja Iglewicz,t and Thomas McKeet 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

Effects of chromite oreprocessing residue on concrete

In the 1960s, a number of industrial and commercial buildings in the Kearny, New Jersey, area were constructed on or adjacent to locally produced chromite oreprocessing residue COPR . This residue, which has the properties of a sandy/silty soil, was used as a fill material to reclaim the indigenous swampy ground conditions, known locally as

Cellulose Mediated Reduction and Immobilization of Cr VI in

It is a great challenge to find an effective method for the treatment of chromite ore processing residue COPR , due to the highly toxic and mobile characteristic of Cr VI in the sludge. This work reported a facile strategy to thoroughly reduce and immobilize Cr VI that was encapsulated in COPR by biomassassistant hydrothermal treatment. After hydrothermal treatment at 160 C for 180 min

Chromium Ore Processing Residue Maryland

Chromium Ore Processing Residue COPR Site Initiative Background and Site Lo ion 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

quotAn Investigation of the Geochemical Properties and Treatment

Chromite Ore Processing Residue COPR contains high concentrations of hexavalent chromium Cr VI , a human carcinogen, and is a hazardous waste that requires intensive treatment prior to disposal. China has banned the lime roasting process since 2013 and an alternative process using soda ash as roasting and complexing agent has replaced it in the larger factories. The process still produces

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.

Chromite Ore Processing Residue in Hudson County, New Jersey

Chromite Ore Processing Residue in Hudson County, New Jersey by Thomas Burke, Jerry Fagliano,t Marcia Goldoft,t Robert E. Hazen, Raja Iglewicz,t and Thomas McKeet 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

Improvement of a Cr VI Extraction Method for Chromite Ore

Chromite Ore Processing Residue COPR Chromite FeCr 2O 4 Chromite ore, CaO, and Na 2CO 3 are heated at 1100o C in a rotating kiln 4FeCr 2O 4 8Na 2CO 3 7O 2 8Na 2CrO 4 2Fe 2O 3 8CO 2 water leach Burke et al. 1991 Environmental Health Perspectives China India Japan Pakistan UK USA New Jersey Maryland High Lime Process

Extraction of Cr VI from chromite ore processing residue via

The manufacture of chromates produces a great amount of chromite ore processing residue COPR . In China, millions of tons of COPR are discharged in annually 4 . These residues contain highly soluble, mobile and carcinogenic toxic Cr VI 5 , posing a great threat to soil and groundwater 6 , 7 .

Effects of chromite oreprocessing residue on concrete

In the 1960s, a number of industrial and commercial buildings in the Kearny, New Jersey, area were constructed on or adjacent to locally produced chromite oreprocessing residue COPR . This residue, which has the properties of a sandy/silty soil, was used as a fill material to reclaim the indigenous swampy ground conditions, known locally as

EVALUATION OF BRIDGES CONSTRUCTED IN CHROMITE ORE PROCESSING

A field investigation was conducted to assess the structural and durability impli ions of bridges constructed in chromite ore processing residue COPR fill. The findings are based on visual inspection and various testing of 31 bridges, lo ed in known chromium and nonchromium sites in and around Hudson County, New Jersey.

Methods of treatment of chromite ore processing residue

Methods of treatment of chromite ore processing residue . United States Patent 7670576 . Abstract: Methods to reduce hexavalent chromium Cr VI in chromite

CHAPTER 1 EXECUTIVE SUMMARY

nature of chromite ore processing residue COPR . The physical micropore structure of chromite ore processing residue may be the ratelimiting factor in the release of hexavalent chromium. What is the nature of this waste material and how does it influence what we know about chromium chemistry

Chromite Ore Processing Residue Supporting Information sized

Chromite Ore Processing Residue Weizhen Liu,a Yao Song,a Jing Li,a LanChinaLing,b Chen Tian,a Xueming Liu,a Zhang Lina a School of Environment and Energy, The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Edu ion , South China University of Technology, Guangzhou 510006,

quotAn Investigation of the Geochemical Properties and Treatment

Chromite Ore Processing Residue COPR contains high concentrations of hexavalent chromium Cr VI , a human carcinogen, and is a hazardous waste that requires intensive treatment prior to disposal. China has banned the lime roasting process since 2013 and an alternative process using soda ash as roasting and complexing agent has replaced it in the larger factories. The process still produces

Chromite ore processing residue in Hudson County, New Jersey

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.

Improvement of a Cr VI Extraction Method for Chromite Ore

Chromite Ore Processing Residue COPR Chromite FeCr 2O 4 Chromite ore, CaO, and Na 2CO 3 are heated at 1100o C in a rotating kiln 4FeCr 2O 4 8Na 2CO 3 7O 2 8Na 2CrO 4 2Fe 2O 3 8CO 2 water leach Burke et al. 1991 Environmental Health Perspectives China India Japan Pakistan UK USA New Jersey Maryland High Lime Process

Effects of chromite oreprocessing residue on concrete

In the 1960s, a number of industrial and commercial buildings in the Kearny, New Jersey, area were constructed on or adjacent to locally produced chromite oreprocessing residue COPR . This residue, which has the properties of a sandy/silty soil, was used as a fill material to reclaim the indigenous swampy ground conditions, known locally as

Extraction of Cr VI from chromite ore processing residue via

The manufacture of chromates produces a great amount of chromite ore processing residue COPR . In China, millions of tons of COPR are discharged in annually 4 . These residues contain highly soluble, mobile and carcinogenic toxic Cr VI 5 , posing a great threat to soil and groundwater 6 , 7 .

CHAPTER 1 EXECUTIVE SUMMARY

nature of chromite ore processing residue COPR . The physical micropore structure of chromite ore processing residue may be the ratelimiting factor in the release of hexavalent chromium. What is the nature of this waste material and how does it influence what we know about chromium chemistry

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 7080 of the content of total Cr. Cr VI concentration was controlled by the

In Situ Reduction of Hexavalent Chromium in Alkaline Soils

1998 . In Situ Reduction of Hexavalent Chromium in Alkaline Soils Enriched with Chromite Ore Processing Residue. Journal of the Air and Waste Management Association: Vol. 48, No. 11, pp. 11001106.

Extraction of Chromium from Chromite Ore

Chromite Ore Processing. Lowgrade ore obtained from an open cut trench at a chromite deposit near Auburn, Calif., was treated in the laboratory using gravitymagnetic separation and flotation beneficiation techniques. Flotation using known methods, however, gave very poor results and will not be discussed further in this report.

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