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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
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Chromium cr contamination of natural resources from unregulated disposal of pretanning industrial waste chromite ore processing residue copr is a serious environmental concern especially in developing countries although there have been studies on copr characterization the fate and transport of chromium emanating from copr remains poorly understood in this study processes governing
Recovery of cr from chromite ore processing residues 2449 i 20 coprh20 2 at 60 c for 30 min the concentration of chromium leached out after the treatment was determined oxidative treatmentoxidation of chromiumiii in the copr 08 mm particle size to chromiumvi was can ied out by employing various oxidants like
As a byproduct of the extraction of chromium from chromite ores chromite ore processing residue copr is a major crbearing waste and has become the main source of cr pollution in the environment after several decades of chromium extraction the accumulated quantity of copr is significant especially in some developing countries
Chromite mineral processing chromite ore processing residueprocessing chromite mineral a review of chromite ore processingresearchgate aug 1 2018 chromite ore processing residue copr is a waste byproduct of chromate production that contains high leve
Oct 31 2012 in the present article chromite ore processing residue copr and soil samples were collected from a chromium contaminated site in tamil nadu state india around 15502 and 2801 mg g 1 of crvi was present in copr and soil samples respectively leachability studies were carried out to assess the leachability of crvi and criii from
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 read more
Apply to chromium ore processing residue copr waste sites in new jersey the request emanated from concerns raised to the commissioner by the hudson county community where most of the chrome ore processing residue waste sites are located the workgroup was comprised of experts from various programs of the department one representative from
Wide array of industrial and consumer products darrie 2001 chromite ore processing residue copr the remaining solid waste product from this process contains variable amounts of unreacted ore and soluble and insoluble forms of crvi and is a persistent source of crvi contamination in notable locations such as baltimore maryland
The sintered mass is crushed and leached with hot water to separate the soluble sodium dichromate a schematic diagram shows 3stage leaching with the water flow counter to the solids the chromite ore processing residue
Us7220394b2 process for simultaneous recovery of chromite ore processing residue copr is an industrial waste material generated during the manufacture of chromates from chromite ore in chromite chromium exists in the trivalent state as chromium iron oxide fecro 4 in this state the chromium is inert and is not soluble in water
Results obtained with both methods were compared for three solid samples with different matrices a soil containing chromite ore processing residue copr a loamy soil and a paint sludge results showed that crvi contents determined by the two methods differ significantly and that the epa method 3060a procedure underestimated the crvi
Chromite ore processing residue leachate is characterized by high ph values and crvi concentrations matern and mansfeldt 2016 this crvi intake resulted in high percentages of mobile and exchangeable cr in the soil and hence maximum cr pore water concentrations of around 200 mg l 1 under oxidizing conditions at the beginning of the
Review of chromite ore processing residue copr current environmental engineering 2014 vol 1 no 2 83 from 19311972 the diamond shamrock company in painesville ohio produced copr as a
Review of chromite ore processing residue copr past practices environmental impact and potential remediation methods current environmental engineering 1
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
Chromite ore processing residue copr is an inevitable solid emission in chromite salt production it is an industrial waste produced during the extraction of crvi from a chromite ore using the hightemperature roasting process11 in general the copr is alkaline ph 125 7 and because of the presence of partially watersoluble
Mar 31 2005 chromite ore processing residue copr which contains hexavalent chromium cr 6 at concentrations typically in the range of thousands of
Healthbased regulatory limits and remediation strategies for chromate crvi in alkaline soils enriched with chromite ore processing residue copr should be based on oxidationreduction and solubility interactions of cr
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
A byproduct of the refining process was a soil like residue generally identified as copr beginning in 1916 much of the plants copr waste went to a plant owned facility in dundalk for use as clean fill behind baltimore harbor bulkheads in its latter years 1967 to 1986 the plant produced on the order of 100000 cubic yards of copr per year
K freese et al review of chromite ore processing residue copr past practices environmental impact and potential remediation methods curr environ eng
Copr chromite ore processing residue all acronyms 26 2 2013 effect of iron ii sulfate addition on chromium vi leaching from columns of chromite ore processing residue environ sci technol 37 3206 3213 crossref google scholar graham mc farmer jg anderson p paterson e hillier s lumsdon dg bewley rj 2006 calcium polysulfide remediation of hexavalent chromium contamination from chromite ore
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
History of chromite ore processing 250tph river stone crushing line in chile 200tph granite crushing line in cameroon 250tph limestone crushing line in kenya 250tph granite crushing line in south africa kefid 120tph granite crushing line in zimbabwe 400tph crushing plant in guinea
Apr 26 2012 in hudson county new jersey there are more than two million tons of leftover chromite ore processing residues copr part of copr was used as construction fill materials spreading the problem to a larger area high solubility of some chromate compounds along with their toxicity is threatening the environment as well as the human health
Chromium compounds except for chromite ore mined in the transvaal region of south africa and the unreacted ore component of the chromite ore processing residue copr copr is the solid waste remaining after aqueous extraction of oxidized chromite ore that has been combined with soda ash and kiln roasted at approximately 2000 of valid 01
The unified bioaccessibility method ubm which simulates the fluids of the human gastrointestinal tract was used to assess the oral bioaccessibility of cr in 27 glasgow soils these included several contaminated with crvi the most toxic form of cr from the past disposal of chromite ore processing residue copr
Review of chromite ore processing residue copr past practices environmental impact and potential remediation methods current environmental engineeringbentham science publishers january 1
Chromite ore processing residue copr waste from a former chromium chemical works 18301968 is still contaminating groundwater in glasgow scotland with carcinogenic hexavalent chromium crvi
Summary epa is granting a petition to delete both chromite ore mined in the transvaal region of south africa and the unreacted ore component of the chromite ore processing residue copr from the reporting requirements under section 313 of the emergency planning and community righttoknow act of 1986 epcra and section 6607 of the pollution