Hydrometallurgy Of Chromite Ore

07 November 2024

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A clean and efficient leaching process for chromite ore

Plot of Kr as a function of oxygen pressure. In summary, the following kinetic equation can be applied to describe the pressure leaching process for chromite ore in 50 wt% …

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07 November 2024

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Study on leaching SiO2 and kinetics of laterite nickel ore in

In this paper, laterite nickel ore was combined with NaOH to extract SiO2 by medium temperature roasting. Firstly, in the single factor experiment, the calcination temperature was 400 °C, the calcination time was 2 h, and the alkali ore ratio was 1.2:1, which was the best calcination conditions. At the same time, the dissolution rate of SiO2 could reach 98.87%. …

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07 November 2024

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Hydrometallurgy

The compositions of chromite ore and residues were analyzed by ICP-OES (PE Optima 5300DV, PerkinElmer). The mineralogical phases of chromite ore and residues were examined with X-ray diffraction (XRD, Phillips PW223/30). The SEM–EDS images of the chromite ore and the residues were obtained with SEM (JSM-7001F + INCA, JEOL) …

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07 November 2024

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Fusion of Chromite Ore Using Sodium Phosphate Salt as Flux …

In hydrometallurgy, fusion techniques are considered key in the processing of chromite ore. Salts containing easily ionized elements are often used as flux, which results in …

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07 November 2024

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22.3: Metallurgy

A commercially important ore of chromium is chromite (FeCr 2 O 4), which is an analogue of magnetite (Fe 3 O 4). Based on what you know about the oxidation states of iron in magnetite, predict the oxidation states of the …

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07 November 2024

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Extraction of Chromium from Chromite Ore

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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07 November 2024

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Preparation of chromium oxide by hydrothermal reduction …

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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07 November 2024

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Precise regulation of the phase transformation for pyrolusite …

The mechanism involved in the phase transformation process of pyrolusite (MnO2) during roasting in a reducing atmosphere was systematically elucidated in this study, with the aim of effectively using low-grade complex manganese ore resources. According to single-factor experiment results, the roasted product with a divalent manganese (Mn2+) distribution rate of …

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07 November 2024

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Potential Processing Routes for Recovery of Platinum …

Table 1 shows that the oxidized PGM ore contains more sperrylite (PtAs 2) and cooperite ((Pt,Pd,Ni)S) grains, and significantly lower (Pt,Pd)-bismuthotellurides grains compared with the pristine PGM ore sample, showing evidence of alteration. Also, the high contents, in oxidized PGM ores, of naturally floating alteration minerals such as talc, serpentine, and …

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07 November 2024

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Effect of Ball Mill Parameters' Variation on the Particles of a

The proven economic values of the secondary resources and various benefits of hydrometallurgy when juxtaposed with primary resources and other extractive metallurgy processes respectively cannot be overemphasized ... (Zhang and S. li ZHENG et al., 2010) carried out an experimental study on the MA effect on the alkali leaching of chromite ore ...

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07 November 2024

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Chrome ore beneficiation challenges & opportunities – A review

Supply of world chromite (chrome ore) has come under severe pressure over the past year driven by strong demand for ferrochrome used in ferroalloy production for making stainless steel.

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07 November 2024

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A Review of Recent Advances in Pyrometallurgical Process

The pyrometallurgical industry plays a vital role in producing metals for our modern life. With growing demand of metals and declining grade of mineable ore, innovations become critical for many mining companies. It is necessary to conduct a review of recent improvements to the pyrometallurgical industry on analytical measurement techniques, process and equipment …

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07 November 2024

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Fusion of Chromite Ore Using Sodium Phosphate Salt as …

In hydrometallurgy, fusion techniques are considered key in the processing of chromite ore. Salts containing easily ionized elements are often used as flux, which results in solutions with ...

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07 November 2024

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Advances towards a Clean Hydrometallurgical Process for Chromite …

The term "chromite" refers to chromium-containing spinels, with a composition of AO·B 2 O 3, where the divalent cation A can be Fe 2+ or Mg 2+, and the trivalent cation B can be Fe 3+, Cr 3+, or Al 3+ . Chromite spinel (FeCr 2 O 4) …

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07 November 2024

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A conceptual hybrid process flowsheet for platinum

A conceptual route to the integrated processing of a Ni-Cu-PGM bearing chromite ore in oxidized mineralization for the recovery of base and precious metals is presented based upon earlier work of the authors and recent research on metal recovery from solution. ... and to promote the development of glycine leaching system in hydrometallurgy.

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07 November 2024

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Fusion of Chromite Ore Using Sodium Phosphate Salt as …

In hydrometallurgy, fusion techniques are considered key in the processing of chromite ore. Salts containing easily ionized elements are often used as flux, which results in solutions with complicated matrices. A matrix correction approach was developed to remove sodium and phosphate ions from a solution obtained from the fusion of chromite using …

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07 November 2024

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Leaching of a low grade Egyptian chromite ore

Leaching of a low grade Egyptian chromite ore ... KANUNGO S.B., JENA P.K., 1988, Reduction leaching of manganese nodules of Indian Ocean in dilute hydrochloric acid hydrometallurgy, 21 (1), 41–58. MAGRITZ M., BRENNER I.B., 1972, The geochemistry of a lenticular manganese ore deposits (Um– Bogma, Southern Sinai) Miner–Deposita, 14, 1–13 ...

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07 November 2024

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Leaching of a low grade Egyptian chromite ore

Leaching of a low grade Egyptian chromite ore ... KANUNGO S.B., JENA P.K., 1988, Reduction leaching of manganese nodules of Indian Ocean in dilute hydrochloric acid hydrometallurgy, 21 (1), 41–58. MAGRITZ M., BRENNER …

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07 November 2024

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Pressure oxidative leaching of Indian chromite ore in …

A novel process for leaching chromite ore has been proposed. Compared to the traditional alkaline roasting process, the new hydrometallurgical process lowers effectively the reaction temperature and enhances the leaching efficiency through pressure oxidative leaching with pure oxygen (O 2) in concentrated sodium hydroxide (NaOH) aqueous solution.The …

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07 November 2024

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Enhanced recovery of nickel from chromite overburden …

Chromite overburden (COB) consisting of low-grade oxidic nickel laterites obtained from Odisha Mining Corporation (OMC), India was used in the present study. The ore sample was ground to a particle size of ~ 75 μm prior to bio-reduction experiments. Chemical analysis of the sample indicated the presence of 0.78% Ni, 0.09% Co, 42.7% Fe, 0.62% ...

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07 November 2024

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Beneficiation of South African chromite tailings using

Chromite tailings ore sample was obtained from a MG chromite processing plant in the Western Limb of the Bushveld Igneous Complex (BIC), South Africa. Characterisation studies were carried out to quantify the different mineral phases, their liberation and association with each other [7]. Chemical composition of different sizes of the feed ...

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07 November 2024

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(PDF) Comparative study of alkali roasting and leaching of …

Comparative study of alkali roasting and leaching of chromite ores and titaniferous minerals. Yotamu Hara. 2015, Hydrometallurgy. See Full PDF Download PDF.

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07 November 2024

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Processing of Ras-Shait chromite deposits

An alternative method, for the utilization of low grade chromite ore which con- tains large amount of iron, is acidic leaching using sulphuric acid (40%) at a temperature of 130-160 [4]. In this range both iron and chromium are leached, together with aluminium. ... Hydrometallurgy, 12 (1984), pp. 21-30. View PDF View article View in Scopus ...

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07 November 2024

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Chrome ore beneficiation challenges & opportunities – A …

Sub-grade chromite ore with Cr 2 O 3 of about 38.5% of Sukinda region of India, can be upgraded to a marketable chrome concentrate of 53–54% Cr 2 O 3 with a recovery of about 58–60% and tailing loss of around 14–16.39% of Cr 2 O 3, by using wet shaking tables in the circuit (Banerjee et al., 2005). Based on the findings of experiments ...

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07 November 2024

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A clean and efficient leaching process for chromite ore

In order to improve the chromate salts cleaner production technology, a pressure leaching process for chromite ore in 50 wt% KOH solution was studied for the first time and the results were presented in this manuscript.It was found out that the chromium extraction rate increased significantly with the increase of temperature and oxygen partial pressure, and the …

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07 November 2024

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Chromium processing | Extraction, Uses & Applications

Chromite deposits are mined by both underground and surface techniques. Much of the ore is rich enough to be used directly: for production of ferrochromium, a rich, lumpy ore containing more than 46 percent Cr 2 O 3 and having a chromium-iron ratio greater than 2:1 is preferred, but ores with a lower ratio and as little as 40 percent Cr 2 O 3 ...

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07 November 2024

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Chapter 21.3: Metallurgy

In hydrometallurgy, metals are separated via the formation of metal complexes. ... A commercially important ore of chromium is chromite (FeCr 2 O 4), which is an analogue of magnetite (Fe 3 O 4). Based on what you know about the oxidation states of iron in magnetite, predict the oxidation states of the metal ions in chromite.

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07 November 2024

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Hydrometallurgical Processing of Low-Grade Ni-Rich …

A clean hydrometallurgical process without hexavalent chromium is demonstrated in this study. First, the chromite is decomposed in sulfuric acid solution with oxidation, and Cr 3+ is extracted into the acid solution. Seed …

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07 November 2024

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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]. ... which is an uneconomical and environmentally unfriendly method. Compared with pyrometallurgy, hydrometallurgy is characterized by low energy consumption, no GHGs production, and low environmental ...

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07 November 2024

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Roasting and Leaching Behavior of Nickel Laterite Ore

The success of the sulfation-roasting-leaching process depends on iron behavior. Due to its higher amount, it is sulfated before nickel. However, the stability of iron sulfates is lower than the nickel sulfate and during the decomposition of iron sulfate, the sulfur xide (SO 3) is liberated and reacts with nickel to form nickel sulfate.This mechanism can reduce …

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