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Treatment Chromite Ore Processing Residue

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Methods Of Treatment Of Chromite Ore Processing Residue

1. 1-75. canceled 76. A method for reducing chromium VI in an underground deposit of chromium ore processing residue, comprising injecting a ferrous liquid into the underground deposit of chromium ore processing residue, with the underground deposit comprising solid residue particles, and with pore spaces between particles, with the ferrous liquid reducing the pH of the pore water to less ...

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 water-soluble 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 ...

Longterm Treatment Issues With Chromite Ore Processing

Long-term treatment issues with chromite ore processing residue COPR Cr6 reduction and heave

Us20070224097a1 Methods Of Treatment Of Chromite Ore

US20070224097A1 - Methods of Treatment of Chromite Ore Processing Residue - Google Patents

Us20100087697a1 Methods Of Treatment Of Chromite Ore

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 ...

Us8192705b2 Methods Of Treatment Of Chromite Ore

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 ...

Chromite Ore Processing Residue Copr Hazardous

Dermatas, D., Bonaparte, R., Chrysochoou, M., and Moon, H., ChromiteOre Processing Residue COPR Hazardous Contaminated Soil or Solid Waste, Journal of ASTM International, Vol. 3, No. 7, pp. 1-10. Chromite ore processing residue COPR, which contains hexavalent chromium Cr6 at concentrations typically in the range of thousands of milligramskilograms, was deposited over a

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 CrVI content in the COPR.

Treatment Of Hexavalent Chromium In Chromite Ore

We investigated a method for delivering ferrous iron into the subsurface to enhance chemical reduction of CrVI in chromite ore processing solid waste COPSW derived from the production of ferrochrome alloy. The COPSW is characterized by high pH 8.511.5 and high CrVI concentrations in the solid phase up to 550 mg kg-1 and dissolved phase 357 mg L-1. The dominant solid-phase ...

Pdf Ettringiteinduced Heave In Chromite Ore Processing

Environ. Sci. Technol. 2006, 40, 5786-5792 Ettringite-Induced Heave in Chromite extensive investigation was undertaken to characterize SA7 COPR and to design and implement an on-site treatment to Ore Processing Residue COPR address both the CrVI hazard reduction while simulta- neously mitigating the COPR heaving phenomena. upon Ferrous Sulfate Treatment The on-site

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

Conversion Of Chromium Ore Processing Residue To

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.

Us7645092b2 Treatment Of In Ground Chromium Ore

In methods for treatment of in ground chromium ore processing residue contamination, ferrous sulfide is provided as a substantially insoluble material in the residue deposit. The ferrous sulfide accordingly may remain substantially in place, in the pores of the soil or residue, even over long periods of time, regardless of underground water movement or diffusion.

Pdf A Review Of Chromite Ore Processing Residue Copr

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 ...

Assessment Of Ferrous Chloride And Portland Cement For The

Chromite Ore Processing Residue COPR is an industrial waste containing up to 7 chromium Cr including up to 5 hexavalent chromium CrVI. The remediation of COPR has been challenging due to the slow release of CrVI from a clinker like material and thereby the incomplete detoxification of CrVI by chemical reagents.

Investigation Of Barium Treatment Of Chromite Ore

Volume 3, Issue 6 June 2006 Investigation of Barium Treatment of Chromite Ore Processing Residue COPR 031 Received 31 March 2005 accepted 29 June 2005

Treatment Of Chromite Ore Processing Residue By Pyrolysis

Chromite Ore Processing Residue COPR is the byproduct of chromate production process, which contains a large amounts of CrVI. The present work developed a new technique to

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 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.

Evaluation Of The Treatment Of Chromite Ore Processing

The effectiveness of the treatment of chromite ore processing residue COPR with ferrous sulfate and encapsulation into asphalt were explored separately and in combination. The asphalt treatment was conducted by mixing COPR or ferrous sulfate pretreated COPR with varying amounts of asphalt. To assess the efficacy of the treatment, the ...

Treatment Of Chromium Contamination And Chromium Ore

The bulletin looks at the treatment of the highly toxic hexavalent form if Chromium CrVI and in many casesits transformation to the relatively low toxicity trivalent form of CrIII, a process that typically involves chemical reduction. ... The bulletin finishs with a short case study of Chromium Ore Processing Residue COPR in Glasgow ...

Methods Of Treatment Of Chromite Ore Processing Residue

Methods of Treatment of Chromite Ore Processing Residue 2010-11-11 Chisick et al. 588319 7670576 Methods of treatment of chromite ore processing residue ...

Experimental Studies On Coupled Treatment Of Chromite Ore

A study was performed to investigate the combined treatment of hexavalent chromium CrVI and heaving in Chromite Ore Processing Residue COPR. Treatment of heaving focused on the intentional exhaustion of the mineral brownmillerite, the hydration of which is considered responsible for volume expansion in COPR deposition sites in New Jersey.

Importance Of Mineralogy In The Geoenvironmental

The geoenvironmental characterization of COPR at two deposition sites New Jersey and Maryland included geotechnical, chemical, mineralogical, and leaching analyses of three main chromite ore processing residue COPR types gray-black GB, hard brown HB, clayey C. Quantitative mineralogical analyses were instrumental in the delineation of the geochemical differences between

Treatment Of Chromite Ore Processing Residue By Pyrolysis

Chromite Ore Processing Residue COPR is the byproduct of chromate production process, which contains a large amounts of CrVI. The present work developed a new technique to treat COPR, and the process involved mixing the COPR with rice straw followed by pyrolysis.

Reductive Treatment Of Chromite Ore Processing Residue

A bench- and pilot-scale treatability study conducted on Chromite Ore Processing Residue COPR from a deposition site in New Jersey showed that regulatory compliance to 20 current or 240 up to 2006 mgkg CrVI was not possible using several common reductants zero valent iron, pyrite, ferrous sulfate due to the slow release of CrVI from the binding minerals and the competing oxidation ...

Methods Of Treatment Of Chromite Ore Processing Residue

Justia Patents US Patent Application for Methods of Treatment of Chromite Ore Processing Residue Patent Application Application 20070224097 Methods of Treatment of Chromite Ore Processing Residue . Sep 7, 2005 - REDOX SOLUTIONS, LLC. Methods to reduce hexavalent chromium CrVI in chromite processing wastes include one or more of the ...

Methods Of Treatment Of Chromite Ore Processing Residue

Justia Patents Forming Insoluble Substance In Liquid US Patent for Methods of treatment of chromite ore processing residue Patent Patent 7,670,576 Methods of treatment of chromite ore processing residue . Sep 7, 2005 - Redox Solutions, LLC. Methods to reduce hexavalent chromium CrVI in chromite processing wastes include one or more of ...

Ettringiteinduced Heave In Chromite Ore Processing

Aug 10, 2006 A pilot-scale treatment study was implemented at a deposition site of chromite ore processing residue COPR in New Jersey. Ferrous sulfate heptahydrate FeSO 4 7H 2 O 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

Leaching Of Hexavalent Chromium From Young Chromite Ore

Mar 18, 2020 Chromite ore processing residue COPR is a waste derived from the chromate extraction from roasted ores and is deposited in some countries in landfills. The objective of this study was to investigate the leaching characteristics of hexavalent Cr CrVI from two COPR samples obtained from unlined landfills in the Kanpur area of northern India.

Remediation Of Chromite Ore Processing Residue Using

Su, C. and Ludwig R.D., 2005, Treatment of hexavalent chromium in chromite ore processing solid waste using a mixed reductant solution of ferrous sulfate and sodium dithionite. Environmental Science and Technology, 39, 62086216. CrossRef Google Scholar

Pyrolysis Treatment Of Chromite Ore Processing Residue

The pyrolysis treatment with biomass is a promising technology for the remediation of chromite-ore-processing residue COPR. However, the mechanism of this process is still unclear. In this study, the behavior of pyrolysis reduction of CrVI by cellulose, the main component of biomass, was elucidated.

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