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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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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 South African chromite. Part 1 ...

Jul 10, 2014  Another cleaner process beyond the proof of concept stage for processing chromite and other refractory ores (Bayca, 2013, Li et al., 2008) is the acid leaching process. It shows that chromite dissolves in concentrated sulfuric acid below 200 °C in the presence of oxidant without generating any chromium (VI)-bearing substance .

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Mineral processing: leaching process of chromium and ...

May 06, 2019  高达10%返现  The current strategy reports the recovery of precious group metals (PGMs) from Na2CO3 roast of Saudi Arabian ophiolitic chromite ore at 1160 °C under atmospheric O2. The influence of roasting temperature (960–1200 °C) and leaching agents (H2O, HCl, H2SO4) and their concentrations on the recovery of PGMs was studied. Chromite roast concentrates a reasonable

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Process for Chromite - MDPI

Jan 28, 2019  acid treatment process: (i) the chromium in the chromite is difficult to leach because of the high stability of the chromite spinel in sulfuric acid solution at room temperature and atmospheric pressure; (ii) iron, magnesium, and aluminum ions can be released into the leachate concomitantly as chromium is leached, and the removal of impurities is

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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 presence of Cr (VI) [ 46] in solution.

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Sulfuric acid leaching of South African chromite. Part 1 ...

The leaching behavior of chromite by sulfuric acid in the presence of oxidant was studied experimentally in this work, where most tests were carried out at 160 °C.The results indicated that magnesium and aluminum were leached out together from the silicate phase and porous amorphous silica was produced as a product layer, while the spinel phase gradually shrank with the duration of leaching.

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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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leaching with caustic of the chromite plant

Leaching Process For Chromite - greenrevolution.org (PDF) Sulfuric acid leaching of Turkish chromite concentrate A high vanadium leaching efficiency of 95.64% was achieved under the optimal conditions, including roasting temperature at 650 °C, 5 wt% sodium persulfate, current density of 1000 A/m², leaching

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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 Na2CO3 roast of Saudi Arabian ophiolitic chromite ore at 1160 °C under atmospheric O2. The influence of roasting temperature (960–1200 °C) and leaching agents (H2O, HCl, H2SO4) and their concentrations on the recovery of PGMs was studied. Chromite roast concentrates a reasonable percentage of

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Process for Chromite - MDPI

Jan 28, 2019  acid treatment process: (i) the chromium in the chromite is difficult to leach because of the high stability of the chromite spinel in sulfuric acid solution at room temperature and atmospheric pressure; (ii) iron, magnesium, and aluminum ions can be released into the leachate concomitantly as chromium is leached, and the removal of impurities is

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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 presence of Cr (VI) [ 46] in solution.

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Chemistry and Leaching Behavior of Chromite Ore Processing ...

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 ...

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

The leaching process of chromite ore is a typical LO reaction, and the oxygen mass transfer in the KOH sub-molten salt solution is a vital factor. In order to intensify the reaction, the catalytic effect of potassium nitrate was examined in previous studies [8]. It was found that the introduction of

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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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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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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 chromite were

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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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leaching processleaching process for chromite in lebanon

Leaching of Valuable Elements from the Waste Chromite . 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 temperatures15 This residue contains a large amount of calcium and a small amount of iron aluminum chromium etc However the COPR from the ...

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Study on mechanisms of different sulfuric acid leaching ...

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 oxidizing agent. The results show that the main phases in ...

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roasting and leaching processess for chromium

Leaching process for chromite - YouTube. 9 Oct 2013 ... 2 step leaching and roasting process chromite - ... Chromite -- Wikipedia, the free encyclopedia. Chromite is an iron chromium oxide: FeCr 2 O... Read more. Selective dissolution of copper from copper-chromium spent catalyst ...

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leaching with caustic of the chromite plant

Leaching Process For Chromite - greenrevolution.org (PDF) Sulfuric acid leaching of Turkish chromite concentrate A high vanadium leaching efficiency of 95.64% was achieved under the optimal conditions, including roasting temperature at 650 °C, 5 wt% sodium persulfate, current density of 1000 A/m², leaching

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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 processleaching process for chromite in lebanon

Leaching of Valuable Elements from the Waste Chromite . 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 temperatures15 This residue contains a large amount of calcium and a small amount of iron aluminum chromium etc However the COPR from the ...

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leaching with caustic of the chromite plant

leaching with caustic of the chromite plant. leaching process for chromite. 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

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This is an electronic reprint of the original article ...

19 Cr-bearing residue generated in sulfuric acid leaching process of chromite has not been described in the open 20 literature. 21 Our earlier studies showed that the generation of Cr-rich sulfates could be restricted or even avoided by 22 optimizing leaching process parameters for South African chromite in the laboratory (Jiang et al., 2014).

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LEACHABILITY OF CHROME FROM MAGNESIA-CHROMITE

leaching indicates super-saturation of the solution and precipitation of the products. INTRODUCTION The working lining of copper refining (anodic) furnace made of magnesia-chromite (MCr) refractory materials is exposed to high temperatures and aggressive slags. The fire refining process of copper is

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Chromium remediation or release? Effect of iron(II ...

Jul 15, 2003  The large increase in leaching of Cr(VI) upon infiltration of sulfate, either as FeSO4 or Na2SO4, was caused by anion exchange of sulfate for chromate in the layered double hydroxide mineral hydrocalumite, a process for which scanning electron microscopy with energy-dispersive X-ray microanalysis provided direct evidence.

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Preventing Chromium Leaching - 911 Metallurgist

Aug 19, 2018  Leaching and Oxidation Resistance of MgOCr2O3. Fixing of Chromium. This report presents the results of research aimed at evaluating and preventing the leaching action that may result from the disposal of waste ferrous slags into landfills where they can be subjected to acid precipitation. Waste slag constitutes a large potential source of ...

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Process Of Extraction From Chromite Ore

Leaching Process For 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 chromateeaching process for chromite - africar-hire clean and efficient leaching process for chromite ore - sciencedirect. Read More

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Extraction of Chromium from Chromite Ore

Jul 20, 2017  The average grade of the metallurgical chromite ore was 43.4 pct Cr2O3, with 52 pct of the ore having a chromium-to-iron ratio of 3:1 or over, 17.6 pct having a ratio between 2:1 and 3:1, and 30.4 pct having a ratio less than 2:1. Chemical-grade chromite ore generally ranged from 40 to 46 pct Cr2O3 with a chromium-to-iron ratio of 1.5:1 to 2:1.

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A novel reductive alkali roasting of chromite ores for ...

After high-temperature reduction, the magnetic separation, aqueous and acid leaching of reaction products yielded 81 wt% and 70 wt% pure Cr 2 O 3 from low (∼4 wt%) and high (>8 wt%) silica-containing chromite ores, respectively. The process diagram explains the extraction of Cr 2 O 3, Fe-Cr alloy, Al 2 O 3, and MgO-Al 2 O 3-silicate, reuse of ...

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(PDF) Microbial leaching of chromite overburden from ...

IntroductionA huge amount of chromite overburden containing 0.4% to 0.9% nickel and 0.02% to 0.05% cobalt is generated in the process of chromite ore mining in the Sukinda mines of Orissa, India. The ore belt spreading over a stretch of 7 km in length from Kansa in the east to Muruabil in the west [1][2] is known to be the only nickeliferous ...

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US4295881A - Process for extraction of platinum group ...

A process for treating chromite-bearing ores to obtain useful mineral values, especially platinum group metal, therefrom wherein the ore is separated into magnetic and non-magnetic fractions; the non-magnetic fraction, containing a substantial portion of the platinum group metals, is concentrated and smelted to produce a metal layer containing platinum group metals; and the platinum group ...

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The Chromothermic Reduction of Chromite

of the chromite spinels. Structural dissociation of the spinels is a basic requirement for making the iron amen­ able to removal. This has been the subject ofconsiderable research effort on the use of selective reduction of iron oxides and subsequent leaching ofmetallic iron. Reduc­ tion has been attempted mainly with solid carbon, but also

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