chromium ore processing residue

chromium ore processing residue

Stabilization of chromium ore processing residue

2006-5-20  Chromium has been classified as a potential carcinogen , and has high and acute toxicity to humans, animals, plants, and microorganisms. Consequently, chromium contaminant in groundwater, chromium ore processing residue (COPR), and sediment represents a significant environmental and public health concern .

Conversion of Chromium Ore Processing Residue to

2019-3-1  kinds of chromium contaminated soils depending on chromium oxidation states, phases, and media compositions. This report summarizes the characteristics of chromite ore processing residue (COPR) in terms of their chemical compositions and phases and results from the melting study to convert to iron with chromium or steel.

Chromium Ore Processing Residue - mde.maryland.gov

2021-3-17  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 or chrome tailings; for the purposes of MDE reports these variants are referenced as COPR.

(PDF) A Review of Chromite Ore Processing Residue

2014-11-17  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...

Chromite Ore Processing Residue in Hudson County, New

Chromite ore processing residue is an industrial waste material generated by the manufacturing of chromates for chromite ore. Chromium is present in the trivalent state in the ore as chromium iron oxide (FeCr204). In this state, the chromium is inert and is not soluble in either acid or water. To produce the hexavalent, water-soluble

Extraction of Cr(VI) from chromite ore processing

2020-7-1  The effective extracting Cr(VI) from chromite ore processing residue (COPR) is the key to achieve COPR detoxification and recovery. We developed an effective method to extract Cr(VI) from COPR via controlling the phase transformation of Cr(VI)-containing minerals. Characteristic analysis showed that Cr(VI) was mainly incorporated in the hydrocalumite (NaCa 4 Al 2 O 6 (SO 4 /CrO 4) 1.5

Leaching of hexavalent chromium from young

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 [Cr(VI)] from two COPR samples obtained from unlined landfills in the Kanpur area of northern India.

(PDF) Different Pathways for Cr(III) Oxidation ...

Chromium ore processing residue (COPR) is an important. source of chromium contamination in the environment. 1, 2. Detoxi ...

Remediation of hexavalent chromium contamination

2017-5-1  Large amounts of chromite ore processing residue (COPR) wastes have been deposited in many countries worldwide, generating significant contamination issues from the highly mobile and toxic hexavalent chromium species (Cr (VI)).

Reduction and immobilization of hexavalent

2019-3-25  Hexavalent chromium (Cr(VI)) is highly mobile, severely toxic (Shahid et al., 2017) and highly carcinogenic to humans . Chromite ore processing residue (COPR) is a type of hazardous industrial waste (Mills et al., 2017; Moon et al., 2008; Wu et al., 2015) that contains a large amount of residual Cr (2000–40,000 mg/kg). Furthermore, 30% of the total Cr comprising COPR is in the form of Cr(VI).

MINERALOGICAL PROPERTIES OF CHROMIUM ORE

Chromium ore processing residue (COPR) has been disposed at hundreds of sites in the US mid-Atlantic Region, including major transportation corridors, harbors, and facilities.

Chromite Ore Processing Residue in Hudson County, New

Chromite ore processing residue is an industrial waste material generated by the manufacturing of chromates for chromite ore. Chromium is present in the trivalent state in the ore as chromium iron oxide (FeCr204). In this state, the chromium is inert and is not soluble in either acid or water. To produce the hexavalent, water-soluble

Conversion of Chromium Ore Processing Residue to

Chrome Steel from Chromium Ore Processing Residue. Geo-Frontiers 2011: Advances in Geotechnical Engineering April 2012 . Show more Show less Authors. Jay N. Meegoda. Professor, Department of Civil Env. Eng., New Jersey Institute of Technology, University Heights, Newark, NJ 07102.

Leaching of hexavalent chromium from young chromite

Leaching of hexavalent chromium from young chromite ore processing residue Katrin Matern1 Harald Weigand2 Ruben Kretzschmar3 Tim Mansfeldt1 1Faculty of Mathematics and Natural Sciences, Dep. of Geosciences, Institute of Geography, Univ. of Cologne, Albertus-Magnus-Platz, Köln, D-50923, Germany 2ZEuUS, THM Univ. of Applied Sciences,

Chrome Steel from Chromium Ore Processing Residue

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Reduction and immobilization of chromate in

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 zero-valent iron (nZVI) and the Cr(VI) speciation and leachability were studied.

Optimisation of metal extraction from chromium ore ...

2018-12-10  The feasibility of extracting metals from chromium (Cr) ore processing residue (COPR) was investigated. COPR samples collected from four sites in New Jersey, USA (sites A, B, C and D) were mixed with 15% carbon by weight with different percentages of sand to neutralise the basic oxide in COPR and heated under a reducing environment to extract metals.

Leaching Mechanism of Cr(VI) from Chromite Ore

The leaching behavior of hexavalent chromium (Cr(VI)) and major metal elements relevant to Cr(VI) leaching from chromite ore processing residue (COPR) to HNO3 are investigated by batch leaching tests. According to the test results, aqueous Cr(VI) accounted for 70-80% of the content of total Cr. Cr(VI) concentration was controlled by the dissolution degree of Cr(VI)-bearing minerals (such as ...

Adsorption Characteristics and Transport Behavior of

This study explored the stratigraphic distribution and soil/shallow aquifer characteristics surrounding a chromium ore processing residue (COPR) dumpsite at a former chemical factory in China. Total Cr levels in top soils (5–10 cm) nearby the COPR dumpsite were in the range of 8571.4–10711.4 mg/kg. Shallow aquifers (1#x2013;6#x2009;m) nearby the COPR dumpsite showed a maximum total Cr ...

Modifications to EPA Method 3060A that improve the

2020-4-17  Cr(VI) extraction efficiency from chromium ore processing residue (COPR)-contaminated soils Christopher T. Mills1, Carleton R. Bern2, Ruth E. Wolf3, Andrea L. Foster4, Jean M. Morrison1, William M. Benzel5 1) U.S. Geological Survey, Crustal Geophysics and Geochemistry Science Center, MS964D, Denver Federal Center, Denver, CO 80225.

Chromite Ore Processing Residue in Hudson County, New

Chromite ore processing residue is an industrial waste material generated by the manufacturing of chromates for chromite ore. Chromium is present in the trivalent state in the ore as chromium iron oxide (FeCr204). In this state, the chromium is inert and is not soluble in either acid or water. To produce the hexavalent, water-soluble

Chromium Ore Processing Residue - Hotel Villa Rosal

Chromium Ore Processing Residue - Maryland 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 or chrome tailings; for the purposes of MDE reports

Chemistry and Leaching Behavior of Chromite Ore

2020-2-27  This study presents chemical, mineralogical, and leaching characterization of chromite ore processing residue (COPR) derived from the soda ash process, which is currently replacing the lime-based process in China, the world's largest chromite processor.

Speciation and Bioaccessibility of Hexavalent Chromium in ...

铬渣(chromite ore processing residue, COPR)主要是采用有钙焙烧工艺生产铬盐过程中产生的工业废渣 ... Chromite ore processing residue (COPR) is a solid waste generated during the production of hexavalent chromium (Cr ...

Leaching Mechanism of Cr(VI) from Chromite Ore

The leaching behavior of hexavalent chromium (Cr(VI)) and major metal elements relevant to Cr(VI) leaching from chromite ore processing residue (COPR) to HNO3 are investigated by batch leaching tests. According to the test results, aqueous Cr(VI) accounted for 70-80% of the content of total Cr. Cr(VI) concentration was controlled by the dissolution degree of Cr(VI)-bearing minerals (such as ...

Specific Gravity of Expansive Chromium Ore

Specific gravity tests were performed on chromium ore processing residue (COPR), an expansive industrial byproduct of the historical processing of chromite ore, to determine if the complexity and heterogeneity of the particle microstructure may cause erroneous specific gravity results using ASTM D854-06 Method B as the baseline procedure.

Optimisation of metal extraction from chromium ore ...

2018-12-10  The feasibility of extracting metals from chromium (Cr) ore processing residue (COPR) was investigated. COPR samples collected from four sites in New Jersey, USA (sites A, B, C and D) were mixed with 15% carbon by weight with different percentages of sand to neutralise the basic oxide in COPR and heated under a reducing environment to extract metals.

Modifications to EPA Method 3060A that improve the

2020-4-17  Cr(VI) extraction efficiency from chromium ore processing residue (COPR)-contaminated soils Christopher T. Mills1, Carleton R. Bern2, Ruth E. Wolf3, Andrea L. Foster4, Jean M. Morrison1, William M. Benzel5 1) U.S. Geological Survey, Crustal Geophysics and Geochemistry Science Center, MS964D, Denver Federal Center, Denver, CO 80225.

Speciation and recovery of chromium from chromite

Chromium contained in contaminated soils and solid wastes can be categorized as exchangeable, oxidizable, carbonate-bound, reducible and residual. The results from this study indicate a need for efficient leaching methodologies in chromite ore processing plants to decrease the non-detrital fractions of chromium in the residue. Aggressive ...

李芸邑-重庆大学环境与生态学院 - cqu.cn

2021-3-22  Yunyi Li *, Jialiang Liang, Zihao Yang, Hang Wang, Yangsheng Liu *, Reduction and immobilization of hexavalent chromium in chromite ore processing residue using amorphous FeS 2,Science of The Total Environment, 2019, 658: 315~323 (4) Wen Liu,Yunyi Li *