chromite de minerai chromite

À propos de LIL

Compositions of chromite, associated minerals, and parental
2014.7.1 Chromite compositions Associated minerals Melt/rock interaction Slab contamination 1. Introduction Chromite can crystallize as an early phase from mafic
Voir plus
Chromite: Mineral information, data and localities.
Chromite is the most important chromium ore mineral. It forms a complete solid solution series with many other members of the group, eg. in the Chromite-Hercynite Series, Chromite-Spinel Series, Chromite-Magnetite
Voir plus
Chromite: The only mineral ore of chromium
Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4 ). It is dark gray to black in color with a metallic to
Voir plus
Chromitite layers indicate the existence of large, long-lived,
2022.3.8 Two hypothetical cases of 2D sections through 3D images showing subdivision of chromite boundaries into chromite-to-silicate minerals (green) and
Voir plus
Chromite Ores, Mining, Processing Britannica
Chromite, relatively hard, metallic, black oxide mineral of chromium and iron (FeCr2O4) that is the chief commercial source of chromium. It is the principal member of the spinel series of chromium oxides; the other
Voir plus
Formation and Evolution of Chromitites in the Hongshishan
2023.2.21 This study describes mineral chemistry, Re-Os isotopes and Platinum-group elements geochemistry of the Hongshishan chromitites for the purpose of
Voir plus
Chromite deposits in China and their origin Mineralium
The major chromite resources of China occur in ophiolites and continental intrusions. Podiform chromite deposits are mainly developed in the Palaeozoic and Mesozoic
Voir plus
Chromite ore beneficiation: prospects and challenges
2023.1.1 Idiomorphic chromite is the only ore mineral appearing in economic quantities. The average content of the ore is 26% Cr 2 O 3 and the Cr/Fe ratio is 1.55.
Voir plus
PGE geochemistry and platinum-group minerals in
2023.7.26 Abstract Podiform chromitites, a part of Nidar ophiolite complex from the Indus Suture Zone (ISZ), southeast Ladakh, host significant platinum-group elements (PGE) and platinum-group of minerals. These high Cr chromitites are found to be enveloped within the dunite rocks in the form of massive, semi-massive and stringers and as disseminated
Voir plus
Chromite- mineralogy and processing - ScienceDirect
1988.1.1 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 purification, filtration, crystallization (as sodium chromate or potassium chromate), and calcination (Burch and Dolbear, 1918; Gu and Wills, 1988;
Voir plus
Chromite- mineralogy and processing - ScienceDirect
1988.1.1 Minerals Engineering, Vol. 1, No. 3, pp. 235-240, 1988 0892-6875/88 $3.00 + 0.00 Printed in Great Britain Pergamon Press ple CHROMITE- MINERALOGY AND PROCESSING F.GU% and B.A.WILLS§ % Dept.of Mineral Engng., Qingdao Employee's College of Mines, Qingdao, Shandong, People's Republic of China § Camborne School
Voir plus
Electric resistivity of fine chromite ore: measurement and
2013.11.22 Le minerai fin de chromite est un matériau brut commun utilisé dans la production d’alliage de ferrochrome par le procédé du four électrique à arc submergé. La résistivité électrique du minerai fin de chromite détermine la distribution du courant, qui, à son tour, affecte l’efficacité de l’opération lors du procédé.
Voir plus
Chromite: Mineral information, data and localities. - Mindat
Type Locality: ⓘ Carrade de Cavalaire, Cavalaire-sur-Mer, Draguignan, Var, Provence-Alpes-Côte d'Azur, France. Polymorph of: Chenmingite, Xieite. Isostructural with: Magnesiochromite, Magnetite. Chromite is the most important chromium ore mineral. It forms a complete solid solution series with many other members of the group, eg. in the ...
Voir plus
Minerals Special Issue : Chromite Deposits: Mineralogy, Petrology and ...
2022.2.10 A chromite occurrence called the Sabantuy paleoplacer was discovered in the Southern Pre-Ural region, at the east edge of the East-European Platform in the transitional zone to the Ural Foredeep. A ca. 1 m-thick chromite-bearing horizon is traced at a depth of 0.7–1.5 m from the earth’s surface for the area of ca. 15,000 m 2.
Voir plus
Chromite de fer - Applications et utilisations générales
4 天之前 La chromite de fer est le minerai naturel de chrome qui est prisé pour ses capacités réfractaires - ce qui le rend inestimable dans la fonderie moderne pour les tâches les plus exigeantes à température. Non seulement cela, mais la chromite trouve de larges utilisations, même lorsque des températures élevées ne sont pas nécessaires. ...
Voir plus
Microstructural Insights into the Evolution of Ophiolitic Chromite
2023.8.7 Therefore, the evolution of mineral CPOs, such as olivine, pyroxene, and chromite, plays a crucial role in understanding the deformation processes within the ophiolitic mantle. In this study, we investigate the microstructural features, including CPOs, misorientations, grain size, and shape factor, of podiform chromitites from Luobusha,
Voir plus
Chromitites in ophiolites: How, where, when, why? Part II.
2014.2.15 A review of previous work relevant to the formation of concentrations of chromite in peridotites from ophiolitic (s.l.) sequences highlights some of the key problems in understanding the complex processes involved.This review forms the basis for chromitite-genesis models that integrate new geochemical data with petrologic, field and
Voir plus
Chromite compositional variability and associated PGE
2022.4.6 The Gomati and Nea Roda ophiolites are located into the Serbo-Macedonian massif of the Chalkidiki peninsula (Northern Greece). The present work focuses on the variability of platinum-group elements (PGEs), geochemistry, spinel mineral chemistry, and platinum-group minerals (PGMs) — base metal minerals (BMMs)
Voir plus
Chromite: The only mineral ore of chromium
Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4 ). It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity. It occurs in basic and ultrabasic
Voir plus
铬铁矿成矿作用与研究进展
2020.11.6 Mineral Deposita, 29: 98-101. doi: 10.1007/BF03326400 Zhou M F, Robinson P T, Su B X, Gao J F, Li J W, Yang J S, Malpas J. 2014. Compositions of chromite, associated minerals, and parental
Voir plus
Les principaux minerais de Madagascar - Madagasikara
Le gisement de chromite. La chromite est un minerai de chrome, un élément qui est principalement utilisé dans la production d’acier inoxydable, d’acier au carbone et d’autres alliages. La chromite est une ressource importante pour Madagascar, car le pays est le deuxième plus grand producteur mondial de minerai de chromite.
Voir plus
Compositions of chromite, associated minerals, and parental
2014.7.1 Podiform chromitites in the mantle sections of ophiolites belong to either high-Cr (metallurgical) or high-Al (refractory) varieties. Their highly variable compositions are reflected by different Cr#s [100Cr / (Cr + Al)] and Cr 2 O 3 and Al 2 O 3 contents of the chromite, falling in the boninitic and MORB fields, respectively. Parental magmas of high
Voir plus
铬铁矿矿物包裹体的聚焦离子束-透射电镜研究 - Earth Science
2019.9.15 Abstract: Mineral inclusions in chromite can record key information of physicochemical conditions (pressure, temperature, etc.), evolution of chemical composition, mechanics of fluid enrichment activities when chromite and its host rock form. However ...
Voir plus
Genesis of chromite deposits by dynamic upgrading of Fe ±
2019.1.18 A fundamental problem in the genesis of all stratiform chromite deposits is how layers of massive to semi-massive chromite that are commonly up to 1 m thick (e.g., Bushveld [South Africa], Stillwater [Montana, USA]), less commonly up to 10 m thick (e.g., Inyala and Railway Block [Zimbabwe], Ipueira-Medrado [Brazil], Uitkomst [South Africa],
Voir plus
Chromite Chromium Ore, Properties, Uses and Occurrence
2023.4.23 Chromite is an oxide mineral that an iron chromium oxide with formula: FeCr2O4. It is belonging to the spinel group. 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.
Voir plus
Magnetic prospecting and geochemical analysis for the mineral ...
2020.9.4 Chromite deposits have long been reported and exploited in Northern Pakistan as a result of the ongoing convergence of Indian and Asian plates. This research work is a study of one such prospect. We used geophysical and geochemical tools such as magnetic susceptibility at seventy-seven observation stations along with fifteen rock
Voir plus
Chromium (Cr) Ore Minerals, Formation, Deposits
2023.4.23 The mineralogy of chromium (Cr) ore deposits is primarily dominated by the presence of the mineral chromite (FeCr2O4), which is the main chromium-bearing mineral. Chromite is a dark, opaque mineral with a high specific gravity and metallic luster. It is typically found in the form of euhedral crystals, irregular grains, or as interstitial ...
Voir plus
A Process Mineralogical Evaluation of Chromite at the
2020.8.12 Chromite is a member of the spinel group and is the only economically important ore mineral of chromium. It is used extensively by the metallurgical industry as feedstock for ferroalloy production [1,2,3,4].Chromite ore is commonly classified into different grades based on the Cr/Fe ratio as well as the Cr 2 O 3 content. These being
Voir plus
Pakistan Mineral Production: Chromite Economic Indicators
Pakistan Mineral Production: Chromite data was reported at 8,598.000 Ton in Apr 2018. This records a decrease from the previous number of 12,845.000 Ton for Mar 2018. Pakistan Mineral Production: Chromite data is updated monthly, averaging 5,849.500 Ton from Jul 1999 to Apr 2018, with 226 observations. The data reached an all-time high of
Voir plus
Platinum-bearing chromite layers are caused by pressure
2018.1.31 The origin of platinum-bearing chromitites (up to 90 vol.% chromite), which occur as monomineralic layers up to a few metres thick and hundreds of kilometres in length within mafic-ultramafic ...
Voir plus
The Effect of Pre-Oxidation on the Reducibility of Chromite
2022.7.20 The majority of ferrochrome (FeCr) is produced through the carbothermic reduction of chromite ore. In recent years, FeCr producers have been pressured to curve carbon emissions, necessitating the exploration of alternative smelting methods. The use of hydrogen as a chromite reductant only yields water as a by-product, preventing the
Voir plus
Petrogenesis of the massive chromitite layer from the
2019.8.22 The Jacurici Complex hosts the largest chromite deposit in Brazil in an up to 8-m-thick chromitite layer within a tectonically segmented 300-m-thick intrusion. The ore has been interpreted as the result of crustal contamination-driven crystallization in a magma conduit. This study addresses the stratigraphy, mineralogical and textural relationships,
Voir plus
Minerals Free Full-Text An Overview of Currently Applied ...
2023.6.13 Approximately 82 different minerals contain chromium (Cr), of which chromite is the only economically viable Cr source being exploited in large volumes [1,2]. The chromite mineral belongs to a spinel mineral group characterized by the formula [(Mg, Fe 2+)(Al, Cr, Fe 3+) 2 O 4] [3,4]. The heat-, corrosion-, and oxidation-resistance of
Voir plus
CHROMITE: FROM THE MINERAL TO THE COMMODITY
2013.2.5 Chromite belongs to the spinel group with the general chemical formula XY2O4, where X and Y represent divalent and trivalent metal ions, respectively. Four types of chromite ore deposits occur as either lode or secondary deposits. Lode chromite ore deposits comprise stratiform and podiform deposits, whereas secondary chromite ore
Voir plus
Chromite chemistry of a massive chromitite seam in the
2020.3.3 The Bushveld Igneous Complex (BIC) is known for its laterally extensive platinum group element–bearing layers, the most famous being the Merensky Reef and the UG-2 chromitite in the eastern and western limbs of the complex. In the northern limb, the Platreef mineralization and a thick chromitite seam below it (referred to as the “UG-2
Voir plus
Automated and Quantitative Mineralogy Applied to Chromite
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 (EPMA) and quantitative evaluation of mineral by scanning electron microscopy (QEMSCAN) mineralogical techniques, and quantitative EPMA. The
Voir plus
铬铁矿_百度百科
铬铁矿（块状、等轴晶系）（Chromite massive Isometric）是岩浆作用的矿物，常产于超基性岩中，与橄榄石共生；也见于砂矿中。外表看来很像磁铁矿，一般呈块状或粒状的集合体。在冶金工业上，铬铁矿主要用来生产铬铁合金和金属铬。铬铁合金作为钢的添加料生产多种高强度、抗腐蚀、耐磨、耐高温 ...
Voir plus