The most important clue to identifying chromite is its association with ultrabasic igneous rocks and metamorphic rocks such as1998年7月20日· Chromite, relatively hard, metallic, black oxide mineral of chromium and iron (FeCr2O4) that is the chief commercial source ofChromite | Ores, Mining, Processing | Britannica
Formula: Fe2+Cr3+2O4 Colour: Black Lustre: Resinous, Greasy, Metallic, SubMetallic, Dull Hardness: 5½ Specific Gravity: 45 48 Crystal System: Isometric Member of:Chromite is an oxide mineral belonging to the spinel group, a complex mineral containing magnesium, iron, aluminum, and Cr in varying proportions, depending on the deposit,Chromite an overview | ScienceDirect Topics
2011年4月1日· Abstract Supply of world chromite (chrome ore) has come under severe pressure over the past year driven by strong demand for ferrochrome used in ferroalloy2023年4月23日· The weathering of chromite ore bodies can also lead to its concentration in placer deposits Name : For its CHROMium content Association : Olivine , enstatite , plagioclase , serpentine , magnetiteChromite | Chromium Ore, Properties, Uses and
2022年2月10日· Since then, chromites have been classified into two descriptive types: “stratiform deposits” mainly associated with layered intrusions in continental cratons,2020年11月6日· The formation of chromite is generally related to basicultrabasic rocks However, the genetic mechanism of chromite deposit remains controversial Deciphering the genesis of chromite deposit is of铬铁矿成矿作用与研究进展
2023年4月23日· 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 be2014年11月17日· Review of Chromite Ore Processing Residue (COPR) Current Environmental Engineering, 2014, Vol 1, No 2 85 Moon et al [33, 68] also studied the use of ferrous(PDF) A Review of Chromite Ore Processing Residue
2020年6月2日· During this slow cooling, chromite and associated minerals crystallized early while the magma was still at a very high temperature Their crystals then settled to the bottom of the magma2017年1月25日· Chromite ore processing residue (COPR) is a hazardous waste derived from the chromate extraction roasting process Despite its (eco)toxicological potential, COPR has been dumped in uncontrolled surface landfills in several countries The leaching of Cr(VI), resulting in the contamination of groundwater, is a key environmental riskChromium contamination associated with Chromite Ore
2006年11月29日· The model is supported by the common observation of phenocrysts, including those of chromite, in lavas and hypabyssal rocks, and by chromite abundances in lavas and peridotite sills associated with the Bushveld Complex indicating that geologically reasonable amounts of magma can account for even the massive, 70 cm thick UG22021年12月28日· Chromite Ore Mining and Associated Factors in the Muslim Bagh Ophiolite of Balochistan, Pakistan Imranul Huda 1, Sanaullah Panezai 2,* 1 Department of Geography and Regional Planning(PDF) Chromite Ore Mining and Associated Factors in the Muslim
2022年4月6日· Chromite mines are not visible anymore, and chromite ore was found in stocks at the coordinates indicating the entrance to St George, Tripes, and Limonadika closed mines (Kockel et al 1978; Christodoulou 1980) At St George, numerous blocks of chromite ore and associated rocks up to 60 cm thick have been found in the bed of a2022年2月10日· It is confirmed by compositions of monomineralic, polymineralic and melt inclusions in chromspinels The presented data indicates that ophiolite peridotites and related chromite ore associated with oceanic and islandarc volcanic rocks, widespread in the Ural orogen, could be the main sources of the detrital chromspinel of the SabantuyChromite Deposits: Mineralogy, Petrology and Genesis MDPI
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 ChromiteHercynite Series, ChromiteSpinel Series, ChromiteMagnetite Series and the ChromiteMagnesiochromite SeriesIt is the iron analogue of Zincochromite, Cochromite, Manganochromite and2011年4月1日· Major associated gangue minerals are talc, quartz, hematite, goethite, limonite, gabbro, serpentine, anorthosite, dunite, and pyroxinite Most of the chromite reserves in the world are concentrated in Africa and Asia followed by Europe, Subgrade chromite ore with Cr 2 O 3 of about 385% of Sukinda region of India,Chrome ore beneficiation challenges & opportunities – A review
2023年1月1日· 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 155 The Kemi chromium mine is an openpit mine with a waste rock to ore ratio of 55:1 At Kemi, the ore from the mine contains 11% iron and 255% Cr 2 O 32020年9月24日· 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 siteChromite mining pollution, environmental impact, toxicity and
Chromite ore is usually a combination of spinels with associated minerals such as calcite, magnetite, talc, serpentines and uvarovite Chromites crystals exhibit an octahedral structure similar to magnetite The Cr 3+ ions are in the octahedral position with oxygen The chromium rich phase is antiferromagneticultramafic rocks and ophiolite sequences Chromite deposits associated with ophiolite sequence termed as Alpine type and chromite deposits of Pakistan are the alpine type In Pakistan chromite is mostly found in ophiolitic rocks near convergent margins [1] Figure 1 Pakistan is bestowed with numerous economic mineral ores and chromite is one ofCHROMITE DEPOSITS OF PAKISTAN: A SHORT REVIEW OAJI
The Zambales ophiolite is the major source of chromite ore in the Philippines The chromitites are concordant cumulates and are associated with distinct chromititebearing sequences within the mantle peridotites Refractory and metallurgical chromite deposits are spatially separated and related to different lithologic associations, which crystallized from2017年5月3日· The principal ore mineral present is chromite, which occurs as relatively large (01–3 mm) subhedral grains with minor overgrowths of ferritchromit and magnetite (Figure 4 A) The grains are commonly highly fractured with fractures filled by veins of magnetite and serpentine Chromite is associated with olivine, or serpentine replacingFull article: Chromite, platinum group elements and nickel
6 Chromite Chromite is the single commercially viable ore of chromium (Cr) which is chemically known as iron chromium oxide (FeCr2O 4) The properties of chromium that make it most versatile and indispensable are its resistance to corrosion, oxidation, wear & galling and enhancement of hardenability Chromium is an important alloying metal in2011年4月1日· The optimum operation parameters determined for the concentration of chromite ores are as follows; a washwater flowrate of 3 1/min, shake amplitude of 15mm, shake frequency of 48 cps, tilt angleChrome ore beneficiation challenges & opportunities – A review
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 ChromiteHercynite Series, ChromiteSpinel Series, ChromiteMagnetite Series and the ChromiteMagnesiochromite SeriesIt is the iron analogue of Zincochromite, Cochromite, Manganochromite andChromite is found as orthocumulate lenses of chromitite in peridotite from the Earth’s mantle It also occurs in layered ultramafic intrusive rocks In addition, it is found in metamorphic rocks such as some serpentinites An Ore deposit of chromite form as early magmatic differentiates It is commonly associated with olivine, magnetiteChromite – Eshal Industries
2018年6月9日· NaOHassisted direct reduction of Ring of Fire chromite ores, and the associated implications for processing June 2018 Journal of the Southern African Institute of Mining and Metallurgy 118:年10月24日· This article describes a new comprehensive study of mantle peridotites and associated podiform chromite ore from the southernmost part of Manipur Ophiolite Belt (MOB), northeast India(PDF) Petrogenesis and tectonic environments for formation of
21 Characterisation Chromite sample was obtained from the western limb of the BIC along the Middle group seam The samples were from MG1, MG2, MG3 and MG4 Particle size distribution on the as received samples were analysed using laboratory sieve screens 1kg from each sample was pulverised to 80% 75μm in preparation for chemical andchromite, relatively hard, metallic, black oxide mineral of chromium and iron (FeCr 2 O 4) that is the chief commercial source of chromiumIt is the principal member of the spinel series of chromium oxides; the other naturally occurring member is magnesiochromite, oxide of magnesium and chromium (MgCr 2 O 4)Chromite is commonly found as brittleChromite | Ores, Mining, Processing | Britannica
Chromite, the principle ore of the element chromium, is a commercially valuable mineral However, due to mining restrictions and the fact that Chromite is not commonly found in crystallized form, it is not wellrepresented in mineral collections Chromite is isomorphous with the mineral Magnesiochromite and is easily confused with it, as they2005年11月10日· The MayaríBaracoa ophiolitic belt in eastern Cuba hosts abundant chromite deposits of historical economic importance Among these deposits, the chemistry of chromite ore is very variable, ranging from high Al (Cr#=043–055) to high Cr (Cr#=060–083) compositions Platinumgroup element (PGE) contents are also variableDistribution of platinumgroup elements and Os isotopes in chromite
The Zambales ophiolite is the major source of chromite ore in the Philippines The chromitites are concordant cumulates and are associated with distinct chromititebearing sequences within the mantle peridotites Refractory and metallurgical chromite deposits are spatially separated and related to different lithologic associations, which crystallized fromOxides – including magnetite (Fe 3 O 4), ilmenite (FeTiO 3), and chromite (FeCr 2 O 4) – may settle and collect at the bottom of a magma chamber, too South Africa’s Bushveld Complex is the most significant and important example of oxide mineral cumulates Figure 977 shows Bushveld chromite layers surrounded by a feldsparrich rock931: Magmatic Ore Deposits Geosciences LibreTexts
2020年6月2日· Chromite is important because it is the only economic ore of chromium, an essential element for a wide variety of metal, chemical, and manufactured products During this slow cooling, chromite and associated minerals crystallized early while the magma was still at a very high temperature2020年4月24日· Chromite is important because it is the only economic ore of chromium, an essential element for a wide variety of metal, chemical, and manufactured products During this slow cooling, chromite and associated minerals crystallized early while the magma was still at a very high temperatureWhat is chromite | SICHENG Chromite Sand
2023年8月17日· Moreover, the ore quality (grade) of the Luobusa chromite deposit is excellent, with the content of Cr 2 O 3 in the ore generally as high as 50%, and Cr 2 O 3 /FeO > 4 [7,8,9] Therefore, due to the great extent of ultramafic rocks, which are the host of chromite deposits in the Luobusa ophiolite, the possibility of discovering new chromite1988年1月1日· The ores can be subdivided into two types: stratiform and podiform ores Stratiform ores are associated with mafic/ultramafic layered intrusions, are Precambrian in age, and have an intracratonic setting Podlform ores are mainly Phanerozic in age, have a highly irregular geometry, and are associated with ophiolites [4]Chromite mineralogy and processing ScienceDirect
Chromite ore is the primary material to produce chromium compounds and chromiumcontaining products In 2018, the global mine production of chromite ore was about 43 million metric tons, with more than 90% of those mined in five countries, Finland, India, Kazakhstan, South Africa, and Turkey South Africa is the leading chromite producerApart from that, separation of chromite from other associated minerals is sometimes very difficult owing to the complexity of ore texture along with presence of near density minerals In chrome ore beneficiation, specific gravity and sizebased separations are the most convenient and costeffective methods [3, 4]Beneficiation of South African chromite tailings using Avestia
2021年11月1日· Objectives: The objectives of this study are to analyze the chromite ore mining and the associated factors in the Muslim Bagh area of Balochistan province and to suggest viable strategies to boostup the production of chromite ore in the area Methods: For this case study, the primary data were collected through2022年3月8日· Ore Geol Rev 90, 65–93 (2017) G Chemistry, morphology and origin of magmaticreaction chromite stringers associated with anorthosite in the Upper Critical Zone at Winnaarshoek,Chromitite layers indicate the existence of large, longlived, and
2023年9月22日· The Koh Safi Chromite Ore Deposit is located in Afghanistan’s northern–northeastern end of the Kabul–Kandahar ophiolite zone Sedimentary formations, delayed volcanic, and ultramafic rock groups, including peridotites and serpentinites, could all have been found in the Koh Safi area, where structural discontinuities with the twoThe present study evaluates the toxicity and bioavailability of Cr in sediments associated with chromite ore processing residue (COPR) Ten stations were sampled in the Hackensack River (NJ, USA) to represent a wide range of total Cr concentrations (1993,970 mg/kg) with minimal interference from potentially toxic, cooccurring chemicalsEvaluation of potential toxicity and bioavailability of PubMed
2010年2月23日· Chromite within pyroxenite rarely hosts any inclusions, but an annealed texture is well developed in massive chromitites Euhedral crystals may be altered and replaced by biotite and sulphides Chains of chromite crystals are commonly associated with intercumulus plagioclase but can also be developed within pyroxene oikocrystsChromite ore processing residue Problems associated with chromite are minimized by (i) rejecting chromite to tailings during flotation; and, (ii) minimizing the internal recycle in the smelter complex of highchromium materials, such as converter slag, toChromite an overview | ScienceDirect Topics
