Leaching of Valuable Elements from the Waste Chromite Ore Processing
1. Introduction. Chromate salts, particularly sodium chromate, are an important inorganic chemical products that have broad application prospects in areas such as high-performance alloys, 1,2 leather, 3,4 electroplating, 5−7 and ceramics. 8−10 The chromite ore processing residue (COPR) is an inevitable solid emission in chromite salt production. It is an …
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Chromite Ore Beneficiation & Processing Plant
The process of chromite ore mining can be divided into 2 areas: Feed preparation; Concentration; ... The concentration phase introduces hydrocyclone technology and spirals to produce the chrome concentrate from which the final product will be derived. The wastewater from this process will report to tailings dams where an additional filtration ...
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Research progress on hazardous chromite ore processing …
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 hexavalent. ... not only improving resource utilization efficiency but also reducing environmental pollution. This provides new ideas and ...
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Process optimization of a chrome ore gravity concentration …
Chromite ore is geologically associated with gangue materials which have lower density compared to pure chromite (FeO.Cr2O3). ... Wills' Mineral Processing Technology provides practising engineers ...
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Chromite Beneficiation Process
The Chromite Extraction Flowsheet Chromite Ore Crushing. The crushing section for this 250 ton per day chrome mill consists of a coarse ore grizzly, a coarse ore bin with pan feeder to a 1'8″ reduction crusher and a crusher discharge conveyor to a crushed ore bin. ... Chromite Process Summary.
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Pyrolysis Treatment of Chromite Ore Processing Residue by …
The pyrolysis treatment with biomass is a promising technology for the remediation of chromite-ore-processing residue (COPR). However, the mechanism of this process is still …
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Towards holistic technology solution to chromite ore …
There is a need for finding a holistic solution to the problem of dumps sites of COPR through scientific development. The present paper reviews and analyzes the current status …
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Quantitative 3D characterization of chromite ore particles
The raw materials industry is aiming at increasing the efficiency of mineral process technology (Whitworth et al., 2022).Higher efficiency may reduce energy consumption and the environmental impact of mining and recycling (Ballantyne and Powell, 2014), and is necessary to satisfy the growing demand for metals (Maisel et al., 2023).Accurate and comprehensive …
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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 …
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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 ).
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Technology Innovations in the Smelting of Chromite …
There is no point smelting a chromite ore if breakeven cannot be achieved. During chromite smelting, energy requirement and its cost depend to a large extent on the technology used in smelting the ore. New process technologies have been developed to reduce energy required for smelting chromite to ferrochrome.
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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 …
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Green metallurgical processing of chromite
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 kiln at 1200 °C, the oxidation and mass transfer are greatly intensified in the new process. ... Based on the new technology, a demonstration project with an annual production ...
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An Overview of Currently Applied Ferrochrome Production
This process starts by batching chromite ore fines (<1 mm) and approximately 1–2 wt% <6 mm reductant ... No new data were created or analyzed in this study. Data sharing is not applicable to this article. ... In Proceedings of the International Seminar on Mineral Processing Technology and Indo-Korean Workshop on Resource Recycling, Chennai ...
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Chrome Ore Beneficiation Guide: Key Methods and Process …
As an important strategic resource, chrome ore is the raw material for the production of stainless steel, heat-resistant alloys, chemicals, etc. The most common type of chrome ore is chromite, which is an iron-containing chromium oxide and an important chrome ore resource in industry. Due to its high specific gravity and magnetic properties, chromite is …
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Advances towards a Clean Hydrometallurgical …
In this study, a clean hydrometallurgical process without the generation of hexavalent chromium is demonstrated. First, the chromite was decomposed and leached by sulfuric acid solution in the presence of an …
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Top 3 Chrome Ore Processing Methods that Get Higher …
Chrome ore magnetic separation Chrome ore has weak magnetism.Therefore, magnetic separation would be a good choice for separating it. Low-intensity magnetic separation: This method is used to get rid of magnetite, increasing the Cr/Fe ratio and selecting the qualified chrome concentrate. This method means a lot to the unqualified chrome concentrate after …
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Characterization of Chromite Ore Processing Residue
This paper summarizes the characteristics of chromite ore processing residue (COPR) in terms of their chemical compositions, phases, and recycling potential of iron and chromium through ...
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New insight into mechanism of Cr(VI) migration and …
Chromite ore processing residue (COPR) storage sites are widely distributed all over the world, causing serious soil and groundwater pollution. However, the differences in soil constituents and properties in different regions are significant, and the dynamic migration and transformation of Cr(VI) in different types of soil under alkaline condition of the COPR site is …
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Mechanism of the Direct Reduction of Chromite …
Direct reduction of chromite (DRC) is a promising alternative process for ferrochrome production with the potential to significantly reduce energy consumption and greenhouse gas emissions compared to conventional smelting.
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(PDF) A Review of Chromite Ore Processing Residue …
A Review of Chromite Ore Processing Residue (COPR): Past Practices, Environmental Impact and Potential Remediation Methods November 2014 Current Environmental Engineering 1(2):82-90
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Chromite Ore Processing Residue Management
Chromite ore processing residue (COPR) is a hazardous waste produced during the extraction of chromium from chromite ore. The management of COPR is crucial due to its environmental …
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Characterization and Processing of Low-Grade Middle Group 2 Chromite
Chromite is considered a strategic mineral in the global economy. It is mainly used as an essential raw material in the production of stainless steel and other metal alloys due to its corrosion and heat resistance properties. High-grade chromite resources are gradually depleting; with the increasing chromite demand in metallurgical applications, studies have focused on …
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Adsorption of Ni(II) on detoxified chromite ore processing …
1. Introduction. Chromite ore processing residue (COPR) is a by-product in the production of chromium salt by the mainstream technology of the calcium-free roasting process (Liao et al., 2017a).The COPR is considered as a hazardous industrial solid waste because it contains 1%–2% hexavalent chromium (Cr(Ⅵ)) (Chrysochoou and Dermatas, 2007), which …
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Chromium steel from chromite ore processing residue
T1 - Chromium steel from chromite ore processing residue - A valuable construction material from a waste. AU - Meegoda, Jay N. AU - Kamolpornwijit, Wiwat. N1 - Funding Information: Acknowledgements The work described in this study was supported by a research contract from the New Jersey Department of Environmental Protection.
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Towards holistic technology solution to chromite ore …
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 Chromium ore reserves, having 45% Cr 2 O 3 content. South Africa and Zimbabwe and India are the Top ve countries of Chrome ore processing industries in the Word (Indian Minerals Year Book 2016).
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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. …
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A cleaner method for preparation of chromium oxide from chromite ore
To establish a cleaner production technology of chromium salt, the pressurized leaching process of chromite ore in 60 wt% NaOH solution, subsequent separation of a chromium salt from the leached solution and Cr 2 O 3 preparation from the intermediate product BaCrO 4 were systematically investigated, and a new highly efficient and economical process for the …
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Microstructural Analyses of Cr(VI) Speciation in Chromite Ore
The speciation and distribution of Cr(VI) in the solid phase was investigated for two types of chromite ore processing residue (COPR) found at two deposition sites in the United States: gray-black (GB) granular and hard brown (HB) cemented COPR. COPR chemistry and mineralogy were investigated using micro-X-ray absorption spectroscopy and micro-X-ray diffraction, …
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Research progress on hazardous chromite ore processing …
It summarizes the methods and approaches used by scholars in recent years to handle COPR: chemical reduction, dry detoxification, pyrolysis, mineralization, …
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