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remediation of chromite ore processing residue using ferrous

Remediation of chromite ore processing residue using

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 [Cr(VI)] to trivalent chromium [Cr(III)] in slurry form and pH adjustment to precipitate Cr(III) as chromium

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(PDF) Remediation of chromite ore processing residue

Remediation of chromite ore processing residue using ferrous sulfate and calcium polysulfide . June 2007; Geosciences Journal 11(2):105-110; DOI: 10.1007/BF02913922. Authors: Mahmoud Wazne. 29.95

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Remediation of chromite ore processi ng residue using

Remediation of chromite ore processing residue using ferrous sulfate and calcium polysulfide 107 2.4. PhysicochemicalA nalyses The elemental composition of the COPR samples was

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Remediation Of Chromite Ore Processing Residues With

Download Citation Remediation Of Chromite Ore Processing Residues With Bacteria, Biomass And Ferrous Sulfate Large amounts of chromite ore processing residues (COPR) containing hexavalent

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Remediation of chromite ore processing residue by

01/05/2011· Hydrothermal remediation (HR) of chromite ore processing residue (COPR) was studied using starch as a reducing agent. X-ray powder diffraction (XRPD) analysis and the Toxicity Characteristic Leaching Procedure (TCLP) tests were used to evaluate the mineralogical changes of the untreated and treated COPR and the remediation effectiveness of COPR, respectively.

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Efficient extraction of slowly-released Cr(vi) from nano

Residual unreacted Cr(vi) incorporated in ferrous-sulfate-reduced chromite ore processing residue (rCOPR) can be slowly released during deposition, posing a significant threat to the environment. Recent studies indicate that such Cr(vi) mainly exists within the nano-sized ion channels of ettringite, forming Environmental Remediation Environmental Science: Nano Recent HOT Articles

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Cellulose Mediated Reduction and Immobilization of Cr(VI

15/07/2020· 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 biomass-assistant hydrothermal treatment. After hydrothermal treatment at 160 °C for 180

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Assessment of ferrous chloride and Portland cement for the

01/10/2015· Chromite Ore Processing Residue (COPR) is an industrial waste produced during the extraction process of chromium from its ore. Millions of tons of COPR were produced in the US using the high lime process. The detailed description of the extraction process is

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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 85 Moon et al . [33, 68] also studied the use of ferrous

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Remediation of hexavalent chromium contamination in

01/05/2017· 1. Introduction. Chromite ore processing residues (COPR) are hazardous industrial wastes which have been disposed in surface soils at many commercial and industrial sites in the USA, UK, China, Japan, India and in many other countries (Dhal et al., 2013).One of the biggest threats of COPR to the environment is the release of hexavalent chromium (Cr(VI)) ions, which are highly

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Remediation of chromite ore processing residue using

18/09/2014· 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. Prior to the S/S process, there was a need for

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Remediation of chromite ore processing residue using

18/09/2014· Tao Huang, Longfei Liu, Lulu Zhou, Shuwen Zhang, Electrokinetic removal of chromium from chromite ore-processing residue using graphite particle-supported nanoscale zero-valent iron as the three-dimensional electrode, Chemical Engineering Journal,

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Remediation Of Chromite Ore Processing Residues With

Download Citation Remediation Of Chromite Ore Processing Residues With Bacteria, Biomass And Ferrous Sulfate Large amounts of chromite ore processing residues (COPR) containing hexavalent

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Remediation of chromite ore processing residue using

Remediation of chromite ore processing residue using ferrous sulfate and calcium polysulfide

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Remediation of chromite ore processing residue using

약어 : Geosciences Journal 2007, vol.11, no.2, pp. 105-110 (6 pages)

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Efficient extraction of slowly-released Cr(vi) from nano

Residual unreacted Cr(vi) incorporated in ferrous-sulfate-reduced chromite ore processing residue (rCOPR) can be slowly released during deposition, posing a significant threat to the environment. Recent studies indicate that such Cr(vi) mainly exists within the nano-sized ion channels of ettringite, forming Environmental Remediation Environmental Science: Nano Recent HOT Articles

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Chromium Remediation or Release? Effect of Iron(II

18/06/2003· 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

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Treatment of Hexavalent Chromium in Chromite Ore

We investigated a method for delivering ferrous iron into the subsurface to enhance chemical reduction of Cr(VI) in chromite ore processing solid waste (COPSW) derived from the production of ferrochrome alloy. The COPSW is characterized by high pH (8.5−11.5) and high Cr(VI) concentrations in the solid phase (up to 550 mg kg-1) and dissolved phase (3−57 mg L-1). The dominant solid-phase

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(PDF) A Review of Chromite Ore Processing Residue

Review of Chromite Ore Processing Residue (COPR) Current Environmental Engineering, 2014, Vol. 1, No. 2 85 Moon et al . [33, 68] also studied the use of ferrous

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Remediation of hexavalent chromium contamination in

Remediation of hexavalent chromium contamination in chromite ore processing residue by sodium dithionite and sodium phosphate addition and its mechanism Yunyi Li a, b, Andrew. B. Cundy b,Jingxuan Feng c, Hang Fu a, Xiaojing Wang,Yangsheng Liu a aCollege of Environmental Sciences and Engineering, Peking University; Beijing Key Laboratory for Solid Waste Utilization and Management,

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