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Review Of Chromite Ore Processing Residue

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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 alone has over 2 million tons of waste COPR.

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  • Leaching Mechanisms Of Crvi From Chromite Ore Processing

    Batch leaching tests, qualitative and quantitative xray powder diffraction XRPD analyses, and geochemical modeling were used to investigate the leaching mechanisms of CrVI from chromite ore processing residue COPR samples obtained from an urban area in Hudson County, New Jersey.

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  • Extraction Of Chromium From Chromite Ore

    Table of ContentsOre SamplesChromite Ore ProcessingShaker Table Concentration of Dry Crushed OreChromium Ore MetallurgyConclusions Chromium has a wide variety of applications in the modern world. Its major uses are in stainless steels and the plating of metals. Other important uses include alloy steel, heating elements, pigments, leather processing, catalysts, and refractories. Of the chromite

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  • Chromium Cleanup Partnership

    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 County39s chrome industry generated approximately 2 million tons of residue, which was later determined to be a hazardous material. 1982

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  • 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

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  • Chromium Remediation Or Release Effect Of Ironii

    Chromite ore processing residue COPR, derived from the socalled high lime processing of chromite ore, contains high levels of CrIII and CrVI and has a pH between 11 and 12. Ferrous sulfate, which is used for remediation of CrVI contamination in wastewater and soils via reduction to CrIII and subsequent precipitation of ironIIIchromiumIII hydroxide, has also been proposed for

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  • Biotreatment Of Chromite Ore Processing Residue By

    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. The watersoluble CrVI of COPR A and B is 3,982.9 and 1,181.4 mgkg, respectively. In the column biotreatment process, P. phragmitetus BB can reduce CrVI in the leachate to an undetectable level

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  • Us7220394b2 Process For Simultaneous Recovery Of

    The present invention relates to a process for simultaneous recovery of chromium and iron from Chromite Ore Processing Residue COPR and more particularly, the present invention relates to an economical and environmentfriendly process for recovering chromium as a chromate salt and iron as an iron salt from nonleachable Chromite Ore Processing Residue and avoids landfilling of toxic metals.

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  • Ettringiteinduced Heave In Chromite Ore Processing

    A pilotscale treatment study was implemented at a deposition site of chromite ore processing residue COPR in New Jersey. Ferrous sulfate heptahydrate FeSO47H2O was employed to reduce hexavalent chromium in two dosages with three types of soil mixing equipment. XANES analyses of treated samples cured for 240 days indicated that all treatment combinations failed to meet the CrVI

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  • 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. At least 15 of the sites

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  • Speciation And Spatial Distribution Of Cr In Chromite Ore

    Remediation of COPR sites requires the key information including chromium oxidation, speciation and spatial distribution. Samples were gathered from a COPR site in Luliang County in Qujing, Yunnan Province of China. The total Cr, CrVI and chromium species were investigated. Results indicated the concentration of total Cr was between 110.5 and 21,774 mgkg, and the concentration of CrVI was

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  • Pdf A Review Of Chromite Ore Processing Residue Copr

    Review of Chromite Ore Processing Residue COPR Current Environmental Engineering, 2014, Vol. 1, No. 2 83 From 1931 1972, the Diamond Shamrock Company in Painesville Ohio produced COPR as a

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  • Pdf Mobilization Of Crvi From Chromite Ore Processing

    Mobilization of CrVI from chromite ore processing residue through acid treatment

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  • Detoxification And Immobilization Of Chromite Ore

    A promising strategy for the detoxification and immobilization of chromite ore processing residue COPR in a spinelbased glassceramic matrix is reported in this study. In the search for a more chemically durable matrix for COPR, the most critical crystalline phase for Cr immobilization was found to be a spinel solid solution with a chemical

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  • 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.

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  • 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 alone has over 2 million tons of waste COPR.

    View More
  • 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 milligramskilograms, was deposited over a timeframe of 50 years as fill at a site referred to as SA7 in Newt surface heaving associated with COPR weatheringinduced mineralogical expansion has been observed at the site over time.

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  • Longterm Stability Of Feso4 And H2so4 Treated Chromite

    1. Introduction. In China, more than 6 million tons chromite ore processing residue COPR have been produced from the high lime process of chromates manufacture so far , , .Only a small part of COPR has been disposed properly, while the rest is stored in heaps .COPR is a hazardous waste which is highly alkaline pH gt 11 and contains 27 total Cr .

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  • Copr Chromite Ore Processing Residue

    related. The list of acronyms and abbreviations related to COPR Chromite Ore Processing Residue

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  • 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 CrVI in addition to CrIII. CrVI is more soluble and mobile when compared to CrIII. The study primarily concentrated on treatment of COPR using solidification and stabilization SS process.

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