Remediation of chromite ore processing residue …
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 …
Efficient reduction of Cr(VI) and recovery of Fe from chromite ore …
Chromite ore processing residue (COPR) is a by-product generated after the leaching of sodium chromate by roasting chromite ore at 1200 °C. However, the residual 1130–8500 mg/kg of highly toxic Cr(VI) in COPR poses a severe threat to the ecosystems ( Du and Chrysochoou, 2018, Xia et al., 2020, Molinari et al., 2021, Guleria et al., 2022 ).
Top 3 Chrome Ore Processing Methods that Get Higher …
Ftmmachinery can design a reasonable chrome ore beneficiation process according to the customer's situation and provide a complete set of chrome ore processing equipment, including crushers, ball mills, magnetic separators, flotation machines, shaking …
Detoxification and immobilization of chromite ore processing …
Chromite ore processing residue (COPR) is a waste produced in high lime chromium salt production process using chromite ((Mg, Fe)(Cr, Al) 2 O 4).It contains up to 2% of mobile, toxic and carcinogenic Cr(VI) [1].It is reported that 2–3 tons COPR is generated in the production of 1 ton sodium dichromate by the high lime process [2].The high lime process …
Microstructural analyses of Cr(VI) speciation in chromite ore
Chromite Ore Processing Residue (COPR) is a solid waste generated during the high temperature (∼1200 °C) roasting process that is used to extract chromium from chromite ore (Antony et al., 2006). Lime-based roasting has been the prevalent method to complex other metals in ore (Fe, Mg, Al) and isolate Cr.
Chromium Remediation or Release? Effect of Iron (II) Sulfate …
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.
Ecological and human health risk assessment of chromite ore processing
In this study, ecological and human health risk assessment (HHRA) of the subsurface environment was performed due to the presence of six different contaminants, i.e., Cr(VI), U, F-, As, NO 3-, and Mo, in the proximity of chromite ore processing residue (COPR) dumping sites of Northern India.The analysis covered a probabilistic risk assessment …
Remediation of Cr(VI)-contaminated soil mixed with chromite ore …
Chromite ore processing residue (COPR) is a major contaminant of Cr(VI)-contaminated soil. It is a by-product of chromium salt during the lime-based roasting process, which was estimated to be nearly 6 million tons in 2004 and has increased by 60,000 tons annually in China (Liu et al., 2020).
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Green metallurgical processing of chromite
A new green metallurgical process for chromite ore has been proposed and developed to solve the serious environmental problem in the traditional production process of chromate. In the new process, the oxidation of chromite ore is carried out in sub-molten potassium hydroxide at 300 °C. Compared with the traditional roasting process in a rotary ...
Pilot scale treatment of chromite ore processing residue …
Two COPR samples of about 2 tons each one were collected from the contaminated area of the abandoned chromite ore processing plant "Cromatos de México", where around 70,000 ton of COPR and others raw materials were confined since 1983.The samples COPR I and COPR II were collected from the zone marked as C-SON 01 and C-SON …
Chromite Process Flowsheet
by L D Michaud February 29, 2024 March 10, 2016 Categories Flowsheets & Flowcharts, Gravity Concentration Tags chrome ore, chromite ore, Small Process Equipment Previous Next
Chromite Ore Processing Plant For Chrome Beneficiation
Chromite Ore Processing Plant is a Chromite Mining Process that recovers the chromite from its ore, It's a gravity chrome Beneficiation Plant for chrome concent enrichment, and it has been proven that the gravity method is an effective solution for the chromite separation. sometimes the chromite is liberated at about 6.4mm, then a jig machine can be used for separating the …
Distribution characteristics of minerals and elements in chromite ore …
In this paper, environmental scanning electron microscopy (ESEM) is applied to characterizing the mineral and element distribution of chromite ore processing residue (COPR). The test results show that Cr-bearing brownmillerite occurs in the rim of COPR particle, while hydroandradite with Cr(VI) in its structure presents inside the COPR particle. Periclase and …
Remediation of chromite ore processing residue by hydrothermal process
1. Introduction. Chromite ore processing residue (COPR) is the solid residue produced by high lime process and classified as a hazardous waste for having 1–2% hexavalent chromium [Cr(VI)] (Kowalski and Gollinger-Tarajko, 2003).It is reported that 2–3 tons COPR is generated in the production of 1 ton sodium dichromate by the high lime process (Ding, 1994, …
Remediation of chromite ore processing residue using …
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.
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50TPH Chromite Ore Beneficiation Process in South Africa
Mineral Processing Cases study: 50TPH Chromite Ore Beneficiation Process In South Africa, how processing plant configurated and what equipments were used? Read more You may also interest in the Chrome ore property and processing methods. Introduction of the chrome ore processing plant.
Research progress on hazardous chromite ore …
Chromite ore processing residue (COPR), which is created during the chromite preparation process of chromite compounds, is considered hazardous waste because it contains chromium trivalent and chromium …
Chrome ore beneficiation challenges
This article reviews the major process flow sheets in practice for the recovery of chromite values from various types of ores and critical issues related to chromite ore beneficiation.
Treatment of Chromite Ore Processing Residue by pyrolysis with …
Chromite Ore Processing Residue (COPR) is a byproduct of the high lime-based roasting chromate production process. The detailed description of the high lime extraction process has been previously reported (Dermatas et al., 2006, Moon et al., 2008).Millions of tons of COPR have been discharged worldwide due to the process, most of which is undisposed …
Efficient immobilization and utilization of chromite ore processing
Chromite ore processing residue (COPR) has been a severe environmental contaminant which is worthy of attention. In this study, we developed an eco-friendly and practical technology for effectively stabilizing and recovering Cr(VI) in COPR via combining FeSO 4 reducing agent and the hydrothermal treatment. A stable spinel phase product was formed …
Extraction of Chromium from Chromite Ore
Chromite Ore Processing. Low-grade ore obtained from an open cut trench at a chromite deposit near Auburn, Calif., was treated in the laboratory using gravity-magnetic separation and flotation beneficiation techniques. Flotation using known methods, however, gave very poor results and will not be discussed further in this report. Tabling of the ...
Sustainable chromium ore processing residue (COPR) waste …
China annually generates millions of tonnes of chromite ore processing residue (COPR), firmly positioning it as a prominent global leader in the chromate industry, having processed approximately 40 % of the world's chromate compounds since 2009, as reported by the (Ministry of Industry and Information Technology, 2012).The country has accumulated a stockpile of …
Thermodynamics of chromite ore oxidative roasting process
To explicate the thermodynamics of the chromite ore lime-free roasting process, the thermodynamics of reactions involved in this process was calculated and the phrases of sinter with different roasting times were studied. The thermodynamics calculation shows that all the standard Gibbs free energy changes of the reactions to form Na2CrO4, Na2O·Fe2O3, …
Evaluation of chromium bioaccessibility in chromite ore processing
Incidental ingestion of Chromite ore processing residue (COPR) particles poses a potential health risk. The purpose of this study was to determine the Cr bioaccessibility from COPR using the in vitro gastrointestinal (IVG) procedure. The bioaccessible Cr(VI) was 53.8% and 42.9%, respectively, in the gastric and intestinal phases from a total of 19 490 mg kg −1 …
Long-term stability of FeSO4 and H2SO4 treated chromite ore processing
1. Introduction. In China, more than 6 million tons chromite ore processing residue (COPR) have been produced from the high lime process of chromates manufacture so far [1], [2], [3].Only a small part of COPR has been disposed properly, while the rest is stored in heaps [2].COPR is a hazardous waste which is highly alkaline (pH > 11) and contains 2%–7% …
Biotreatment of chromite ore processing residue by
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. phragmitetus BB can …
Identification of Cr(VI) speciation in ferrous sulfate-reduced chromite …
1. Introduction. Chromite ore processing residue (COPR) is an industrial waste generated during the extraction of Cr(VI) from chromite ore using the high-temperature lime-based roasting process [[1], [2], [3]].When COPR undergoes weathering reactions during the deposition process, it would release highly toxic and mobile Cr(VI) due to the destabilization …
Towards holistic technology solution to chromite ore …
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 …