• Chromium contamination associated with Chromite Ore

  • Abstract Chromite ore processing residue COPR is a hazardous waste derived from the chromate extraction roasting process Despite its ecotoxicological potential COPR has been dumped in uncontrolled surface landfills in several countries
  • Chromite Ore Processing Residue COPR Hazardous

  • Abstract 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 JerseySignificant surface heaving associated with COPR weatheringinduced mineralogical expansion has been observed at the site
  • Extraction of CrVI from chromite ore processing residue

  • Abstract The effective extracting CrVI from chromite ore processing residue COPR is the key to achieve COPR detoxification and recoveryWe developed an effective method to extract CrVI from COPR via controlling the phase transformation of CrVIcontaining minerals Characteristic analysis showed that CrVI was mainly incorporated in the hydrocalumite NaCa 4 Al 2 O 6 SO 4 CrO 4 15
  • LongTerm Leaching Characteristics of Chromite Ore

  • Aug 11 2016 LongTerm Leaching Characteristics of Chromite Ore Processing Residue Using Synthetic Groundwater VI from two types of COPR unweathered grayblack GB and weathered hardbrown HB via advective groundwater flow The release of CrT and CrVI from GB and HB COPR showed peak concentration before 55 PVFs and decreased
  • Remediation of chromiumslag leakage with electricity

  • Aug 29 2014 UK investigators estimated that approximately 25 million tons of chromite ore processing residue were found on several sites in the vicinity of
  • Mobilization of CrVI from chromite ore processing

  • Batch leaching studies on chromite ore processing residue COPR were performed using acids to investigate leaching of hexavalent chromium CrVI with respect to particle size reaction time and type of acid HNO3 and H2SO4 Aqueous CrVI is maximized at approximately 004 mol CrVI per
  • Mobilization of CrVI from chromite ore processing

  • Batch leaching studies on chromite ore processing residue COPR were performed using acids to investigate leaching of hexavalent chromium CrVI with respect to particle size reaction time and type of acid HNO3 and H2SO4 Aqueous CrVI is maximized at approximately 004 mol CrVI per kg of dry COPR at pH 7681
  • 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 CrVI to trivalent chromium CrIII in slurry form and
  • 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 CrVI to trivalent chromium CrIII in slurry form and pH adjustment to precipitate CrIII as chromium
  • 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
  • Leaching of Valuable Elements from the Waste Chromite Ore

  • Chromite ore processing residue COPR is a hazardous waste due to the presence of highly mobile CrVI In this paper the reductionimmobilization of COPR using composite materials fly ash
  • 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
  • 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
  • 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
  • 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 Multiple complementary analysis methods including leaching tests Xray powder diffraction Xray absorption
  • Chromite Ore Processing Residue in Hudson County

  • Chromite Ore Processing Residue in Hudson County New Jersey by Thomas Burke Jerry Faglianot Marcia Goldoftt Robert E Hazen Raja Iglewiczt 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
  • Chromite Ore Processing Residue Supporting

  • Chromite Ore Processing Residue Weizhen Liua Yao Songa Jing Lia LanChinaLingb Chen Tiana Xueming Liua Zhang Lina a School of Environment and Energy The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education South China University of Technology Guangzhou 510006
  • Speciation and Recovery of Chromium From Chromite Ore

  • 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
  • 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
  • Hydrogarnet A Host Phase for CrVI in Chromite Ore

  • Feb 13 2007 Remediation of chromite ore processing residue by hydrothermal process with starch Process Safety and Environmental Protection 2010 DOI 101016jpsep201011002 James M Tinjum Craig H Benson Tuncer B Edil Treatment of CrVI in COPR Using Ferrous SulfateSulfuric Acid or Cationic Polysulfides

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