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Mineralogical Analysis of a Chrome Ore from South

2018.1.19  Ming-Feng Ye and Guang-Liang Wu. Abstract The investigations on chemical composition, mineral composition, embedded figures, texture and microstructure of chrome ores were conducted systematically by various analysis methods such as

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Microstructural analyses of Cr(VI) speciation in chromite ore ...

2020.7.5  Chromite Ore Processing Residue (COPR) is a solid waste generated during the high temperature (∼1200 °C) roasting process that is used to extract

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(PDF) Mineralogical characterization and evaluation of chromite

Chromite samples from Aetoraches mine area in the southern part of the Vourinos complex in Western Macedo-nia, Greece were examined from mineralogical-geochemical

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Chromite mining pollution, environmental impact, toxicity

2020.9.24  Here we review chromite mining in India, impact of chromite pollution on plants and the environment, and phytoremediation of Cr-polluted soils. Chromite mining

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Mineralogical Analysis of a Chrome Ore from South Africa

2018.1.20  The investigations on chemical composition, mineral compositionMineral composition , embedded figures, texture and microstructure of chrome oresChrome ore

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Chromite ore beneficiation: prospects and challenges

2023.1.1  Mining of chromite deposits is being carried out both by open-pit and underground mining. Early mining of chromite was on a small-scale and was relatively

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Chromitite layers indicate the existence of large, long-lived,

2022.3.8  Three-dimensional framework of chromite crystals. The analysis and quantification of chromitite in three-dimensions (3D) using high-resolution X-ray

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(PDF) A Process Mineralogical Evaluation of Chromite at the

A process mineralogical study based on three texturally and mineralogically different chromite-bearing ore types at the Nkomati nickel mine was undertaken, with focus on

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Automated and Quantitative Mineralogy Applied

2023.2.16  A characterization study of chromite ore from South Africa was conducted using bulk assays, X-ray diffraction, optical, scanning electron microscopy (SEM), automated electron probe microanalysis

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Analytical and mineralogical studies of ore and

2008.2.15  The analysis of the South African chromite ore sample has allowed to establish that it was a mineral with a 42.43% of Cr 2 O 3 and a Cr 2 O 3 /FeO ratio of

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3-D numerical modelling of Domino failure of hard rock

2013.2.7  Fetr6 is an underground mine using the stope-and-pillar mining method. As there was some evidence regarding pillar failure in this mine, improving works such as roof support and replacing existing pillars with concrete pillars (CP) were carried out. During the construction of the second CP, in the space between the remaining pillars, one of the

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Minerals Free Full-Text ASTER-Based Remote

2021.7.19  A single chromite deposit occurrence is found in the serpentinized harzburgite unit of the Khoy ophiolite complex in northwest Iran, which is surrounded by dunite envelopes. This area has

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Free Full-Text (Bio)leaching Behavior of Chromite

2018.6.20  In India, there are 9900 mining leases, spread over an area of 7453 km 2, covering 55 minerals other than fuel.The Sukinda valley in Jajpur District, Orissa, known for its chromite (FeCr 2 O 4) ore

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A new method for gravity separation: Vibrating table gravity ...

2019.3.18  A gravity concentrator namely “vibrating table” has been developed with the objective of increasing the product quality of density based physical separation processes. The system is mainly composed of a vibration unit, an inclined chute, TW and WW jets. The principle idea of the separation is to combine the involved forces of a

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Modeling of Knelson Concentrator Operating Parameters by

2023.7.5  Abstract In this study, modeling and optimization tests were conducted on enrichment of chromite ore by Knelson concentrator. For this purpose, the three-level Box–Behnken experimental design method was applied. The analysis of variance (ANOVA) was used at 95% confidence interval to test the significance of independent variables

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Chromite - an overview ScienceDirect Topics

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 recoverable

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Afghanistan has chromite, lithium. The Taliban wants to cash

2022.11.4  Jawed Noorani, an Afghan mining expert, estimated that the Taliban was collecting more than $1 billion a year in taxes on minerals. Mansfield said the government has also doubled coal exports to ...

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Advanced Analytics for Mineral Processing SpringerLink

2022.2.23  Introduction to Mineral Processing. Mineral processing is a field that contends with procedures and technologies used for separating valuable minerals from gangue or waste rock. It is a process that converts the extracted ore through mining activity into a more concentrated material, which serves as an input for the extractive metallurgy.

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A new method for gravity separation: Vibrating table gravity ...

2019.3.18  Chromite liberation of high grade ore was starting below 1000 μm and reaching up to approx. 75–80% below 425 μm. Majority of the chromite (Cr 2 O 3) was reported as free and liberated from the host minerals providing a more convenient angle for concentration methodology design. Therefore, lump particles in the original sample batch

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Microstructural analyses of Cr(VI) speciation in chromite ore ...

2020.7.5  The analysis yielded only two species, shown in Fig. 9: the majority of spectra from individual spots that had an observable pre-edge peak at 5993 eV that signals the presence of Cr(VI) had a post-edge spectrum that was identical to the chromite post-edge spectrum (Fig. 9 a). A single spectrum was observed that had different post-edge

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Chromitite layers indicate the existence of large, long-lived,

2022.3.8  Three-dimensional framework of chromite crystals. The analysis and quantification of chromitite in three-dimensions (3D) using high-resolution X-ray computed tomography (HRXCT) revealed that ...

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Chrome Ore Market Size, Global Research Report

2023.7.26  The chrome ore market size is expected to cross USD 6.58 Billion by the end of 2035, expanding at a CAGR of 2.5% during the forecast period, i.e., 2023-2035. Asia Pacific is expected to hold 35%

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(PDF) Resource Intensity Trends in the South

2022.12.27  The emergence of a symbiotic relationship with the platinum-group metals industry was identified as a major development, with chromite ore intensity decreasing from 2.54 to 1.98 kg per kg ...

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Plants predict the mineral mines - ScienceDirect

2022.7.1  Results. A total of 105 plant species belonging to 95 genera and 43 families were recorded from the three mining regions. CA and TWCA classified all the stations and plants into three major mining zones, corresponding to the presence of marble, coal, and chromite, based on Jaccard distance and Ward’s linkage methods.

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Mining Sector Profile - Uganda Investment Authority

2014.11.19  mining companies have taken up licenses in the mining sector. Over the last ten years the sector has been growing positively with growth rates peaking 19.4% in FY 2006/07. In FY 2009/2010, the sector grew by 12.8%. In terms of licenses taken, in 1999 there were 66 licenses issued in the

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Chromium (Cr) Ore Minerals, Formation, Deposits

Modified date: 23/04/2023. Chromium (Cr) ore refers to a natural mineral deposit that contains chromium in its raw form. Chromium is a chemical element with the symbol Cr and atomic number 24. It is a hard, lustrous, and corrosion-resistant metal that is widely used in various industrial applications due to its unique properties.

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IJERPH Free Full-Text Groundwater Quality, Health Risk

2023.1.24  Groundwater contamination by heavy metals (HMs) released by weathering and mineral dissolution of granite, gneisses, ultramafic, and basaltic rock composition causes human health concerns worldwide. This paper evaluated the heavy metals (HMs) concentrations and physicochemical variables of groundwater around

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Life Cycle Assessment in mineral processing – a review of the

2021.12.4  3.1.1 Group 1 – mining and beneficiation as a single stage. Most of the studies considered beneficiation altogether with the mining operation. For example, Awuah-Offei and Adekpedjou carried out a review scrutinising the very first LCAs applied to the mining sector.This work is focused on the extraction stage, and it mentions the

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Chromite- mineralogy and processing - ScienceDirect

1988.1.1  Both its high resistance to corrosion and relatively high strength make chromium a valuable material for use in the mining industry (Gu and Wills, 1988). Producing chromium from chromite ore (FeCr2O4) is usually a multistep process involving one or more of the following unit operations: pyrometallurgical digestion, leaching with water, solution ...

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Occurrence and mineral chemistry of chromite and related

2016.10.27  The Hongshishan mafic-ultramafic complex is located in the western Beishan Terrane, NW China, and hosts an economic Ni-Cu deposit. Chromite as accessory mineral from the complex is divided into three types based on its occurrence and morphology. Quantitative electron probe microanalysis (EPMA) have been conducted on

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Case Study: Chromite mining and processing - Public

Canada imported approximately 74,000 tonnes of chromium-containing products in 1991.5 Chromium (VI) is used to make pigments for dyeing textiles, tanning leather and colouring glass. Chromium is used widely for electroplating and for making alloys, including stainless steel.2,6 It also has uses in wood preservation and corrosion control.1,2.

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Minerals Free Full-Text Resource Intensity

2022.10.28  Thematic analysis was used to analyse the drivers of the changes to measure improvements in resource intensity. ... the concentrated ore being cheaper for ferrochrome producers than incurring the

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Review of Cr(VI) environmental practices in the chromite mining

2017.11.1  The Fe content in the FeCr produced depends on the chromite spinel Cr/Fe ratio. Therefore, the selective removal of Fe from the chromite spinel using different combinations of chromite pre-oxidation, pre-reduction, and sulphuric acid leaching was investigated. The Cr/Fe ratio of the case study ores could be increased from 1.57 up to

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Prospecting for ophiolite-type chromite deposit in Sartohay,

2023.5.1  The model of the mining area reveals that the chromite orebodies are deeply buried in the southwest section (−370 to −220 m), and covered shallowly in the northeast section (−270 to −40 m). ... From the analysis of petrophysical properties, chromitite exhibits obvious high density, low magnetic (or non-magnetic), and high

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Risks and opportunities for mining - KPMG

2024.1.9  The belief technology is a positive rather than a risk is now almost universally accepted in the mining sector. An overwhelming majority (82%) of survey respondents identified technological disruption as an opportunity rather than a threat. But just how this disruption will affect players within the sector is still being worked through.

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(PDF) Mining Industry in Sudan - ResearchGate

2020.12.6  The mining industry of Sudan was mostly driven by extraction fuel and minerals, with petroleum accounting for a substantial contribution to the country's economy, until the autonomous region of ...

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Gemological Characterization of Peridot from Pyaung-Gaung

2009.6.1  The Pyaung-Gaung peridot mining area is located approximately 10 km north-northwest of the town of Mogok (again, see figure 2) and situated on a ridge along Taung Me Mountain, the highest mountain in the Mogok metamorphic complex, underlain by large granitic intrusives of biotite microgranite (Kabaing) (Iyer, 1953; Harlow and Thu,

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What is chromite (chrome) ore and where is it found

2 天之前  Chromium is extracted from chromite ore. Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4).. Companies in South Africa supply chrome ore from the lower and middle group chromitites of the Bushweld complex and from the upper group chromitite seam (UG2) in addition to platinum group minerals.

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Characterizing toxic Cr(VI) contamination in chromite mine overburden ...

2013.9.15  In most areas of Sukinda valley the chromite mine overburden contains nickeliferous laterite with 0.4–0.8% Ni. In a recent study the analysis of overburden soil showed the presence of a variety of metals which included hexavalent chromium and total chromium in the range 12–311 and 3589–14,486 mg kg −1, respectively [13].

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South Africa's Mining of Iron Ore Chrome Industry, 2019

2020.2.7  It has 36% of the world's chromite reserves, and is the is the world's largest chrome producer and second-largest producer of ferrochrome. ... The iron ore mining sector employed 18,613 people in ...

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