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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A new metallurgical process for the clean utilization of chromite ore

A new metallurgical process for extracting chromium from chromite ore is proposed to overcome the severe chromium (VI) pollution in chromate production industry. When the 60 wt.% KOH solution was used to decompose chromite ore, the chromium and iron ions in chromite ore were oxidized into soluble K 2 CrO 4 crystal and insoluble KFe 3 O 5 particle, respectively.

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Chrome ore beneficiation challenges & opportunities – A …

Considering the tailing disposal problems of chromite gravity plants, the research works carried out by Amer and Ibrahim (1996) on hydrometallurgical processing of low grade chromite ore (Barramiya, Egypt), with a new technique using mechanical alkaline treatment in an attritor followed by oxidative leaching in an autoclave reveals that even a ...

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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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Chrome ore beneficiation challenges & opportunities – A …

Many of the strategic minerals are inputs into products in fast-changing markets. 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. The comprehensive condensation of pertinent facts is intended to provide a ...

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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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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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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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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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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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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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A new method for the treatment of chromite ore processing …

Chromite ore processing residue (COPR), derived from the so-called high-lime processing of chromite ore, contains a significant fraction of a leachable Cr(VI) which is harmful to human being and other organisms. In recent years, the concern over environmental pollution from the waste residue containing Cr(VI) has become a major problem for the chromium chemical …

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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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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 …

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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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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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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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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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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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Copper slag-aided mechanochemical detoxification soda ash chromite ore …

The soda ash chromite ore processing residue (SA-COPR) is a hazardous solid waste generated inevitably in the production process of chromate, even if detoxified, it is prone to the reoccurrence of Cr(VI). Copper slag (CS) is mainly composed of Fe(II) rich mineral-fayalite and can be used as a potential reductant.

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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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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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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 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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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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Technology Innovations in the Smelting of Chromite Ore …

Four primary processes are available for smelting chromite ore to produce ferrochrome. They are: Conventional smelting process, Outokumpu process, DC Arc route, and Premus technology.

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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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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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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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Co-treatment of chromite ore processing residue and …

The production of chromate from the roasted chromite produces millions tons of Chromite Ore Processing Residue (COPR) annually [1], [14].Due to the industrial incomplete roasting and leaching, about 6 wt% of Cr remain within COPR particles including 1130 − 8500 mg/kg of hazardous Cr(VI) [7].Unlike less toxic and less mobile Cr(III), Cr(VI) is highly mobile …

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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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