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Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr 6+) at concentrations typically in the range of thousands of milligrams/kilograms, was deposited over a timeframe of 50 years as fill at a site referred to as SA7 in New Jersey.
Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr6+) at concentrations typically in the range of thousands of milligrams/kilograms, was deposited …
The primary objective of this study is to demonstrate an efficient and optimum way to recover chromium and iron from chromite ore processing residues (COPR) for the production of chrome steel and stainless steel. In Hudson County, New Jersey, there are more than two million tons of leftover COPR.
High amounts of chromite ore processing residue (COPR) have been deposited in the environment in numerous indus-Abbreviations: CAC, calcium aluminum chromium oxide hydrate(s); COPR, chromite ore processing residue(s); ICP–OES, inductively coupled plasma optical emission spectrometry; PV, pore volume(s); SEM, scanning
Chromite is the most common ore containing Chromium, with an empirical formula of FeCr 2 O 4. The Cr and Fe are present in Chromite in the +3 and +2 oxidation states respectively, which is why it is best written and thought of as Cr 2 O 3 FeO. Cr is present in soil at concentrations ranging from 5 to 1000 ppm.
Investigations since 1970 indicate that chrome residue was used at approximately 148 acres of the 580-acre Terminal. The COPR was used to expand the terminal so that it could become the vital economic …
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 human health.
1. Introduction. Chromite ore processing residue (COPR) is a byproduct produced in chromite processing at high temperature (1000–1200 °C). 2.5–3 tons of lime-based COPR were generated per ton of chromium salt (calculated by Na 2 CrO 4) (Fu et al., 2021).Although soda roasting (less than 0.8 tons of COPR per ton of sodium dichromate) …
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 …
Chromite ore processing residue (COPR) is a byproduct produced in chromite processing at high temperature (1000–1200 °C). 2.5–3 tons of lime-based COPR were generated per ton of chromium salt (calculated by Na2 CrO 4) ( Fu et al., 2021 ).
The primary objective of this study is to demonstrate an efficient and optimum way to recover chromium and iron from chromite ore processing residues (COPR) for the …
Chromium ore is an important metallic raw material that is widely used in the metallurgy industry, chemical industry, and refractory. Clarifying the consumption mechanism of chromium ore is crucial for policy making, enterprise production, and commodity investment. Based on the signal decomposition tool and S-curve model, a …
Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr6+) at concentrations typically in the range of thousands of milligrams/kilograms, was deposited over a timeframe of 50 years as fill at a site referred to as SA7 in New Jersey.
Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr 6+) at concentrations typically in the range of thousands of …
Hexavalent chromium shows up in predominantly three forms: 1) Trivalent Chromium, which occurs naturally as chrome ore and is also an essential nutrient for proper metabolism; 2) Metallic or Elemental Chromium, typically found in aerospace alloys; and 3) Hexavalent Chromium, typically from industrial processes like welding and thermal spray.
A pugmill treatability study was conducted to remediate chromite ore processing residue (COPR) using ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O) as a reductant. Two different types of COPR, with respect to particle size and mineralogy, were tested in this study.
A pilot-scale treatment study was implemented at a deposition site of chromite ore processing residue (COPR) in New Jersey. Ferrous sulfate heptahydrate (FeSO4·7H2O) 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 …
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 residue, chrome ore processing residual …
The mineralogical and chemical composition of chromite ore processing residue (COPR) from a site in the north of France (Lille) was investigated. The mineralogical composition was obtained by X-ray diffraction and Rietveld analysis.
This process generates waste, chromite ore processing residue (COPR) as a solid mud. COPR could contain about 2–10% of total Chromium present in the ore, embedded in the residue as rock form and available mostly as water insoluble/non-leachable material.
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. …
Diagenesis of Buried Chrome Ore Processing Residue Bruce M. Sass; ... mineralogical changes that have taken place in buried COPR due to hydration of mineral phases that were produced during ore processing. Along with the high-temperature phases, hydration products have been identified and quantified using x-ray powder diffraction …
Chromite ore processing residues (COPR) is the source of the Cr(VI) contamination in the environment. Pannonibacter phragmitetus BB was used to treat two different types of COPRs in this research. The water-soluble Cr(VI) of COPR A and B is 3,982.9 and 1,181.4 mg/kg, respectively. In the column biotreatment process, P. …
ii 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.
The Hudson County Chromate Chemical Production Waste Sites are located throughout Jersey City, Bayonne, Kearny, Newark and Secaucus in Hudson and Essex Counties. NJDEP has identified over 160 sites that are contaminated with chromite ore processing residue, also known as chromate waste. The chromate chemical production waste has …
Abstract and Figures Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high …
Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr6+) at concentrations typically in the range of thousands of milligrams/kilograms, was deposited over a timeframe of 50 years as fill at a site referred to as SA7 in New Jersey. Significant surface heaving associated with COPR weathering-induced mineralogical ...
ates waste, chromite ore processing residue (COPR) as a solid mud. COPR could contain about 2–10% of total Chromium pre-sent in the ore, embedded in the residue as rock …
Chrome Ore 125-140 Cinders, Blast Furnace 57 Cinders, Coal 40 Clay (See Bentonite, Diatomaceous Earth, Fuller's Earth, Kaolin & Marl)- ... Nickel (Cobalt Sulphate Ore) 80-150 Oats 26 Oats, Crimped 19-26 Oats, Crushed 22 Oats, Rolled 35 Oat Flour 19-24 Oat Hulls 8-12 Oil Cake 45-50 Orange Peel, Dry 15
Keywords Chromite ore processing residue (COPR) · Safe management · Remediation · Chrome (VI) contamination · Groundwater contamination · Anion exchange process Introduction Overview of chromite ore processing Chromite ore FeO·Cr 2 O 3 is a major ore for Chromium. India accounts for about 10% of world share of shipping grade
APPEARANCE: Chrome ore is usually black, but does show some variation from iron‐black to brownish‐black with some brown streaks. ... unreacted ore component of the Chromite Ore processing residue are exempt from the reporting requirements under Section 313 of the Emergency Planning and Community Right‐To‐Know Act of 1986 (EPCRA) and ...
Diagenesis of Buried Chrome Ore Processing Residue. GeoCongress 2008: Geotechnics of Waste Management and Remediation June 2012 . Assessment of Brownmillerite and Periclase Hydration in Chromite Ore …