leaching process for chromite
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leaching process for chromite

A clean and efficient leaching process for chromite ore ...

Jun 01, 2014 · Pressure leaching process of chromite ore in 50% KOH solution3.1.1. Effect of parameters. The application of KOH solution to process amphoteric mineral resources such as chromite ore, vanadium slag and titanium slag has been proved to be feasible and attractive (Liu et al., 2013, Liu et al., 2009, Zhang et al., 2005).

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(Bio)leaching Behavior of Chromite Tailings

The leaching of Cr for chromite tailings can be explained by two main processes. The first main process for Cr leaching is associated with the presence of phosphate anions in solution, which can exchange with chromate and bi-chromate anions, promoting the

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Leaching of Valuable Elements from the Waste Chromite Ore ...

from the calcium roasting process is the residue of water leaching after mixing chromite, sodium carbonate (Na 2 CO 3), and dolomite and calcining at high temperatures.15 This residue contains a large amount of calcium and a small amount of iron, aluminum, chromium, etc. However, the COPR from the non-calcium-roasting process always contains a ...

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Sulfuric acid leaching of Turkish chromite concentrate ...

Nov 01, 2002 · In this research work the sulfuric acid leaching of a typical Turkish chromite concentrate was studied. The following was concluded considering the experimental results: 1. In the absence of perchloric acid, the maximum chromium extraction was about 58% under the conditions of 175 °C, 70 vol% H 2 SO 4 (81.4 wt.%) and 2 h.

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Leaching of hexavalent chromium from young chromite ore ...

Mar 18, 2020 · 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.

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Advances towards a Clean Hydrometallurgical Process for ...

The sulfuric acid leaching behavior of the chromite in Zhao et al. ’s study can be illustrated as shown in Figure 3, where four types of spinel, denoted as I, II, III, and IV, represent different states at specific stages of the leaching process. Spinel I shows that the particle becomes smaller with the duration of the leaching.

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Recovery of chromium from residue of sulfuric acid ...

Jan 01, 2018 · For the sulfuric acid leaching process of chromite, the produced Cr-rich leachate has usually pH ≈ −1.5, which needs to be adjusted pH > 2 for subsequent treatments. On the basis of this and the experimental findings from this work, the Cr-rich solution obtained from chromium recovery can be used for the pH adjustment, and the unreacted ...

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Intensification of solid–liquid separation by thermal ...

Apr 01, 2021 · In the leaching process of chromite, how to quickly separate sodium chromate from leaching slurry is a key issue. In this paper, a simple method, named thermal sedimentation, was firstly introduced into the solid–liquid separation of sodium chromate.

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A cleaner method for preparation of chromium oxide from ...

Jan 01, 2017 · Two kinds of chromite with various Fe(II) contents were employed to verify the proposed speculation on the role of Fe(II) in the leaching process of chromite. Moreover, the subsequent extraction of chromium from the leachate was studied, and a new process for chromium oxide production from chromite is put forward in this paper. 2.

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Study on mechanisms of different sulfuric acid leaching ...

高达12%返现 · Sep 05, 2017 · The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally friendly process. This paper aims to study the sulfuric acid leaching process using chromite as a raw material via either microwave irradiation or in the presence of an

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A clean and efficient leaching process for 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

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Mineral processing: leaching process of chromium and ...

May 06, 2019 · The current strategy reports the recovery of precious group metals (PGMs) from Na 2 CO 3 roast of Saudi Arabian ophiolitic chromite ore at 1160 °C under atmospheric O 2.The influence of roasting temperature (960–1200 °C) and leaching agents (H 2 O, HCl, H 2 SO 4) and their concentrations on the recovery of PGMs was studied.Chromite roast concentrates a

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Leaching of Valuable Elements from the Waste Chromite Ore ...

from the calcium roasting process is the residue of water leaching after mixing chromite, sodium carbonate (Na 2 CO 3), and dolomite and calcining at high temperatures.15 This residue contains a large amount of calcium and a small amount of iron, aluminum, chromium, etc. However, the COPR from the non-calcium-roasting process always contains a ...

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(Bio)leaching Behavior of Chromite Tailings

The leaching of Cr for chromite tailings can be explained by two main processes. The first main process for Cr leaching is associated with the presence of phosphate anions in solution, which can exchange with chromate and bi-chromate anions, promoting the

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Leaching of Valuable Elements from the Waste Chromite Ore ...

The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally friendly process.

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Leaching of hexavalent chromium from young chromite ore ...

Mar 18, 2020 · 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.

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CN101817561B - Method for pollution-free production of ...

The invention belongs to the field of chromite hydrometallurgy and chromium chemical industry, and in particular relates to a method for the pollution-free production of sodium chromate by pressure leaching of chromite. The method comprises the following steps of: 1) reacting the chromite with oxidizing gas in solution of NaOH; 2) diluting the product obtained by the step

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Novel Method for Producing Chromic Oxide without ...

Sep 08, 2021 · The traditional roasting process for producing hexavalent chromium compounds from chromite ore (using calcium carbonate), requires oxidation roasting at 1100°C, water leaching, removal of impurities, and multi-stage evaporation crystallization.

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US20150014225A1 - Method for recovering chromite, and ...

A method for recovering chromite from ore slurry obtained by processing nickel oxide ore, the raw material, in a plant for the wet smelting of nickel oxide ore. In the method chromite is separated and recovered from an ore slurry obtained from a nickel oxide ore when nickel and cobalt are recovered from the nickel oxide ore. The method has a grain diameter separation

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Processing of Peridotite Rocks of Chromite Ore Overburden ...

May 05, 2020 · This work describes a leaching process for the conversion of high-magnesium peridotite rock, which is a chromite ore overburden, into two valuable products: magnesium salts and micro silica. Under normal leaching conditions, residue remaining after leaching is of a gelatinous nature and thus hinders the filtration process. To address this issue, oxidative

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Sulfuric acid leaching kinetics of South African chromite ...

Mar 04, 2015 · The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the

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Cleaner Production of Chromium Oxide from Low Fe(II)-Chromite

The optimum process conditions of leaching treatment were found to be a temperature of 176 °C, a dichromic acid/chromite mass ratio of 0.12, and a sulfuric acid concentration of 81%. Furthermore, the dissolution behavior of chromite in the leaching process and the effect of dichromic acid were experimentally investigated.

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Leaching of chromite ore in concentrated KOH by catalytic ...

Abstract CuO was used as a catalyst in the concentrated KOH solution to enhance the leaching of chromium from the chromite ore. The impacts of temperature, KOH-to-chromite ore mass ratio, CuO-to-chromite ore mass ratio, and gas flow rate on the chromium leaching rate were investigated. The results indicated that CuO played an important role in improving the

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Leaching With Caustic Of The Chromite Plant

Leaching With Caustic Of The Chromite Plant . Caustic Leaching of Montana Chromite. Plant Corporation. Three mills were built which pro duced 102,000 dry tons of chromite concentrates, but before the end of the war, Lmpor te of chr omtte from foreign countries were large enough so that wor kon the.

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Long-Term Leaching Behavior of Chromite Ore Processing ...

Jul 03, 2021 · Leaching characteristics of chromium ore processing residue (COPR) for the long term (simulating a 20-year leaching scenario) were investigated using laboratory flow-through column testing with synthetic rainwater and groundwater for 250 pore volumes of flow (PVFs).

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Chemistry and Leaching Behavior of Chromite Ore Processing ...

Nov 05, 2018 · 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.

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Leaching of hexavalent chromium from young chromite ore ...

ground and roasted chromite ores. In the roasting process, insoluble trivalent chromium [Cr(III)] present in the ores oxidizes to soluble hexavalent Cr [Cr(VI)], which is then recovered by aqueous leaching for further processing (Burke et al., 1991). The technology dates back to 1845 and is still in

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A cleaner method for preparation of chromium oxide from ...

A new leaching process for preparing chromium oxide from chromite was studied for this paper, using Cr(VI) extracted from the remediation treatment of chromite ore processing residue (COPR) as an ...

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Sulfuric acid leaching kinetics of South African chromite ...

Mar 04, 2015 · The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the

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The production process of chromite sand | HAIXU - Chromite ...

Apr 24, 2020 · The production process of chromite sand. Chromite ore is predominantly used in the production of ferrochrome – an alloy of chrome and iron containing between 50% and 70% chromium. The production of steel is the largest consumer of ferrochrome, especially stainless steel production which contains between 10% and 20% ferrochrome content.

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Green Metallurgical Processing of Chromite | Request PDF

Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of

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A Cr⁶⁺⁻ Free Extraction of Chromium Oxide from Chromite ...

of the process is that, under reducing and subsequent leaching conditions, the oxidation of Cr3+ to Cr6+ is completely avoided; thereby decreasing the risk of land, air and water pollution. KEYWORDS Chromite ore, carbothermic reduction, alkali, chromium(VI), chromium extraction, chromium oxide.

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US7601313B2 - Acid/microwave leaching of titanium ore and ...

A process of producing 99% plus titanium dioxide product by using conventional and microwave heating and leaching of the titanium compound feedstock using acid and oxidants. The solid residue from the leaching is used to produce the high quality titanium oxide by froth flotation. Hydrochloric acid can be recovered by multi-stage evaporation.

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WO2014153639A1 - Recovery of nickel in leaching of ...

The invention provides a process for the leaching of a laterite ore or concentrate for the recovery of value metals, at least one value metal being nickel. The laterite ore or concentrate is subjected to a leaching step in acidic mixed chloride solution to leach nickel from the laterite ore. Nickel is extracted with an oxime at a lower pH than other processes for extraction of nickel from ...

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Microbial leaching of chromite overburden from Sukinda ...

Aug 07, 2013 · Leaching of nickel and cobalt from two physical grades (S1, 125–190 μm, coarser and S3, 53–75 μm, finer) of chromite overburden was achieved by treating the overburden (2% pulp density) with 21-d culture filtrate of an Aspergillus niger strain grown in sucrose medium. Metal dissolution increases with ore roasting at 600°C and decreasing particle size due to the

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Treatability of chromite ore processing waste by leaching ...

In this study, leaching characteristics of total Cr and Cr(VI) were investigated using laboratory column studies. The data obtained from the experimental studies were analysed to assess the treatability of chromite ore processing waste (COPW) by leaching and to identify the leaching strategies that enhance mass removal rates of chromium species.

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Leaching of chromite ore in concentrated KOH by catalytic ...

Abstract CuO was used as a catalyst in the concentrated KOH solution to enhance the leaching of chromium from the chromite ore. The impacts of temperature, KOH-to-chromite ore mass ratio, CuO-to-chromite ore mass ratio, and gas flow rate on the chromium leaching rate were investigated. The results indicated that CuO played an important role in improving the

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Chromite (Cr2FeO4) | CrFeO4 - PubChem

Foundry sand use of chromite is a modern application. Sand is used to contain molten metal in a desired shape until the metal has solidified. Sand used in the foundry industry is washed, graded, and dried. Since silica sand is common and inexpensive, it is the most commonly used mineral.

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