(PDF) Extraction of Platinum Group Metals
ous solution extraction and precipitation methods are ... The Kell process is a patented hydrometallurgical alternative to smelting that is totally insensitive to the chromite content of the feed ...
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Design of underhand cut and fill method for extraction …
chromite ore is being extracted by open pit methods. Several open pit mines are being operated on strike of the ore body by various mining companies. This practice has blocked the chromite ore in barrier pillars between the open pit mines. For example, a huge block of chromite ores has been left in the barrier pillars between 'Jindal ...
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Chemical beneficiation of chromite ore to improve the …
1. Introduction. The international market for chromite ore (synthetic formula – FeO.Cr 2 O 3), the only commercially viable source of new chromium (Cr) units, is predominantly driven by the global demand for ferrochrome (FeCr).Secondary FeCr markets comprise of the Cr chemicals-, abrasives-, refractories-, and foundry sand …
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Process optimization of a chrome ore gravity concentration …
conventional chromite ore beneficiation process plant (Figure 3) consist of two sections: . Communition (for preparing the material for the subsequent unit operations) . Concentration ...
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Simultaneous oxidation of Cr(III) and extraction of Cr(VI) …
The new LHW-hDES exhibited excellent extraction performance for Cr (VI), the extraction capacity was as high as 198.402 mg g⁻¹, optimum extraction conditions at the mass of hDES 0.10 g, vortex ...
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Study on Extraction of Iron From Chromite | Request PDF
Recently, a carbo-thermic reduction followed by hydrochloric acid leaching was tried as an efficient method [15] for the extraction of iron from a poor chromium concentrate. Specific research ...
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The Soda-Ash Roasting of Chromite Minerals: Kinetics
hydrometallurgical extraction of chromate from lean chro- of increasing oxygen partial pressures and decreasing CO2 mite ores[8] were also reported. However, the traditional pressures at the reaction interface between Na2Cr2O4 and method of sodium chromate extraction on a commercial Na2CrO4. Since the chromite mineral is a solid solution
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A cleaner method for preparation of chromium oxide from chromite …
A general decomposition mechanism of chromite is proposed suggests that the oxidation of ions in spinel plays a significant role in decomposing chromite. Furthermore, the extraction process of ...
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Geotechnical Investigations
Thus, there is an urgent need for conducting geo-technical investigations to develop a proper stoping method for the extraction of chromite lodes. The Geomechanical properties of hanging wall, foot wall and the ore zone plays an integral part in evaluating the suitability of stoping method and proposed rate of extraction with safety considerations.
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Review of Chromite Ore Processing Residue (COPR): Past …
During the high temperatures used for chromium extraction brown millerite (Ca2(Al, FeIII)2O5), periclase (MgO), and larnite (βCa2SiO4) are the predominant minerals formed after the extraction process [1]. ... Wang T, He M, Pan Q. A new method for the treatment of chromite ore processing residue. J Hazard. Mater 2007; 149: 440-44. Du, J, Lu J ...
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Chromite Ore
Several of the problems associated with this practice of chromite extraction are that the Afghanistan Local Police (ALP) were illegally involved in the process, that the TFBSO had provided training for mineral resource processing and about $13,000 to the police for an ore crusher. ... Chromite bricks are made by standard methods. Bonds may be ...
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Processing of Low-Grade Chromite Ore for Ferroalloy
The low-grade siliceous chromite ore from Ghutrigaon, Odisha, India, containing ~ 16% Cr2O3, with Cr/Fe ratio of 1.97 and ~ 55% of SiO2, does not find any use in metallurgical industry and hence considered as waste. Mineralogical investigation indicates the presence of chromite and quartz as major minerals with minor fuchsite …
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A cleaner method for preparation of chromium oxide from chromite
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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(PDF) Recovery of Chromite Values from Plant Tailings by …
Numerous methods for recovering chromite values using conventional beneficiation methods such as gravity separations, magnetic separations, flotation, have been proposed and reported during the ...
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Preparation of Superconcentrate and Chromium Powder from Chromite …
Non-traditional metallurgical technology of comprehensive processing of Sevan chromite (with a 43–46% Cr 2 O 3 content) is developed allowing chromium extraction from local chromite in the form of more expensive chromium powder. The process of increasing the reactivity of chromite concentrate (with a Cr 2 O 3 content of …
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Electrochemical enhanced oxidative decomposition of chromite …
An electrochemical decomposition method for chromite in KOH solution is proposed. • The extraction rate varies parabolically with alkali concentration and temperature. • The increase in slot current density and alkali-to-ore ratio favors the extraction. • The impurities, especially the aluminate, have negative effect on the …
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Sample preparation for geochemical analysis: Strategies and
Rocks containing refractory minerals such as chromite, zircon, barite, and rutile are extremely difficult to complete dissolution. ... In case of saline waters, the analyte(s) have to be separated from the salt matrix by methods such as solvent extraction or ion-exchange, and in the case of water samples with high organic content, …
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Sufficient extraction of Cr from chromium ore
The method developed in this work to control and regulate the Cr host phases can also be extended to chromite to improve the extraction of Cr. In addition, this study provides inspiration for the development of efficient and practical Cr extraction techniques and provides an important reference for the resource utilization of COPR and …
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Chromite mining
Chromite is a mineral that contains chromium. It is considered a strategic mineral, which generally means that it is necessary for military and industrial use during periods of national emergency. The strategic mineral concept was created during World War I and became law just prior to World War II with the passage of the Strategic Minerals Act ...
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Characterization of Nickel in Chromite Beneficiation Tailings …
Prior to conducting H 2 SO 4 leaching, gravity methods (magnetic separation and Falcon concentrator) were performed to obtain liberated chromite minerals. The effect of leaching temperature, acid concentration, reaction time and solid-to-liquid ratio on the extraction behavior of Ni and Cr in a H 2 SO 4 solution was investigated based …
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Process for extraction of platinum group metals from chromite …
FIG. 3 is a schematic flowsheet of a method used for processing of a South African chromite-bearing ore containing platinum group metals in order to produce chromite concentrates, residues containing platinum group metals and nickel, copper and cobalt as metals or compounds suitable for further purification processes.
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A cleaner method for preparation of chromium oxide from chromite
Cleaner Production of Chromium Oxide from Low Fe (II)-Chromite. Sulfuric acid-based leaching is a promising cleaner method to produce chromium salts, but its feasibility for treating low Fe (II)-chromite still remains to be proven. …
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A clean and efficient leaching process for chromite ore
Compared to the cleaner chromate salts production technology, the pressure leaching method realized high chromium extraction at much lower reaction temperature and with shorter leaching time. Hence it is a more efficient way to process chromite ore. Download : Download full-size image; Fig. 6. Effect of temperature on the chromium …
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A cleaner method for preparation of chromium oxide from chromite …
DOI: 10.1016/j.psep.2021.11.052 Corpus ID: 244758943; A cleaner method for preparation of chromium oxide from chromite ore @article{Tian2021ACM, title={A cleaner method for preparation of chromium oxide from chromite ore}, author={Yijuan Tian and Xuejun Quan and Gang Li and Xiaoyu Tang and Xianfeng Qin and Haifeng Wu and Kui Zeng and …
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(PDF) Chromite. Processing and Applications
In the paper are shown the history, processing and applications of chromite. Chromite is an oxide of iron and c hromium with the chemical composition. FeO.Cr O and belonging to the spinel …
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Chromite mining pollution, environmental impact, toxicity …
Chromite mining activities are indispensable for production of goods and services. Sukinda is a major mining site of Odisha, India, polluted by chromium, which is highly toxic in its hexavalent form. The Sukinda valley is a rich source of chromites, amounting to almost 95% of Cr available in India, and is the fourth most polluted site …
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Chromite
Chromite (Cr) occurs exclusively in mafic and ultramafic igneous rocks (Papp and Lipin, 2006).Although some Cr-based minerals such as crocoite (PbCrO 4), vauquelinite (Pb 2 Cu[CrO 4][PO 4]), uvarovite (Ca 3 Cr 2 [SiO 4] 3), and merumite (4(Cr,Al) 2 O 3 ·3H 2 O) are well known, chromite (FeCr 2 O 4) is the only one that is a commercially …
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The extractive metallurgy of south africa's platinum ores
The extraction technology for platinum-group metals (PGMs) has changed dramatically in the last 80 years, and the changes are likely to continue for years to come. This article will review advances in PGM extraction, including developments in semi-autogenous and fully autogenous milling; flotation equipment applications for treating high-chrome ores; …
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11.5 Refractory Manufacturing
drying and firing of chromite-magnesite ore. The emission factors are presented in units of kilograms of pollutant emitted per megagram of chromite ore processed (kg/Mg CrO3) (pounds per ton of chromite ore processed [lb/ton CrO3]). Particle size distributions for the drying and firing of chromite-magnesite ore are summarized in Table 11.5-6.
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Chromite | Chromium Ore, Properties, Uses and Occurrence
Chromite is the most important ore of chromium. Crystals are uncommon, but when found they are octahedral. Chromite is usually massive or in the form of lenses and tabular bodies, or it may be disseminated as granules. It is sometimes found as a crystalline inclusion in diamond. Chromite is dark brown to black in color and can …
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