Chromium ore deposits range in age from 35billion yearold chromite in the Selukwe greenstone belt Zimbabwe to the ophiolitehosted Miocene deposits of New Caledonia They provide indications of the evolving earths tectonic processes in oceanic and continental crust and mantlePodiform orebodies are hosted in peridotites mostly now
Chromite a brownish black cubic mineral belonging to the spinel group is the only ore mineral from which metallic chromium and chromium compounds are obtained it has the chemical formula fecr 2 o 4 and a theoretical composition of 320 feo and 680 cr 2 o 3 in its natural form it occurs in solid solution with other minerals in the spinel
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May 16 2019nbsp018332study of chrome ore magnetic separation and gravity separation process the chrome ore beneficiation processes include gravity separation flotation magnetoelectric separation and chemical beneficiation etc because of the chrome ore composition that composed of one or more silicate and the density difference between the chrome and silicate the research both in home and aboard about
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Properties of chromite ore sand chromite sand belongs to the chromium spinel group the main mineral composition is feo183cr2o3 the actual mineral is composed of a mixture of various spinels the density of chromite sand is 448gcm3 the mohs hardness is 556 and the refractoriness is gt1900176c the main properties of chrome ore
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Chromite cr2feo4 chrome ore iron chromite chromite cr2feo4 1308312 100 designates that a specific chemical identity andor percentage of composition has been withheld as a trade secret 4 firstaid measures inhalation move to fresh air call a physician if symptoms develop or persist 1 6 material name chromox chromecast
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Studies on flocculation characteristics of chromites ore jan 20 2018183 chromite is a spinel mineral varies widely in chemical composition with the chemical formula fe 2 mg cr al fe 3 2 o 4 the substitution of the element occurs in the chromite ore composition
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Chromite ore 48 cr2o3 chromite ore high grade 48 iranorigin round the year supply at extremely competetive priceswe are a company based i
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The ore is mined either updip or downdip in rooms approximately 20mwide with the roof supported by ore pillars scrapers haul chromite to ore passes that load trains on the haulage level the trains load a conveyor in the hoisting adit the dimensions in the waterkloofmillsell mining block have allowed wcm to replace scrapers with load
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A method of producing sodium chromate from chromite ore which involves mixing the ore with sodium carbonate and a refractory diluent pelleting the mixture using an aqueous solution of sodium hydroxide potassium hydroxide sodium aluminate sodium silicate sodium chromate or mixtures thereof drying and roasting the pellets under oxidizing conditions then disintegrating and extracting the
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We first produced an interstitial melt composition by crystallizing u 1b at f o 2 qfm where qfm is the quartzfayalitemagnetite buffer with an arbitrary 1 h 2 o added until it reached saturation in orthopyroxene having a composition similar to that of the observed orthopyroxene en 80 and in chromite t 1205176c
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Chromite mineral facts chemical formula fecr 2 o 4 oxide of iron and chromium chromium oxide 680the iron may be partly replaced by magnesium and the chromium by aluminum and ferric iron
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Economic uses chromite is used for its silver shiny appearance chromium whose main ore is chromite is used to create chrome surfaces to protect cars stoves and other appliances from corrosion as well as improve their looks 6 chrome surfaces are created by electroplating and chromizing
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Streams from ug2 ore processing have become a valuable raw material for ferrochrome producers as was predicted some 14 years ago cramer basson and nelson 2004 the composition of chromite varies substantially and a comprehensive overview of each ore or concentrate is beyond the scope of this paper the typical compositions of some
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Detailed mineralogical investigations of chromite in the lower and critical zones in the northwestern sector of the bushveld complex have revealed significant compositional variations with regard to modal proportions hostrock lithology and stratigraphic height superimposed on these variations are longrange systematic trends in the composition of chromite in the massive layers
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Comments chromite is shiny and black and makes a curiouslooking cabochon with no special attraction occasionally a cabochon has a reddish color the stones have little value because the material is extremely abundant but are cut as curiosities only sometimes weakly magnetic name in allusion to the composition
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Although chromium occurs in many minerals the only ore exploited commercially is chromite this spinel mineral is ideally composed of ferrous oxide and chromic oxide with the chemical composition feo 183 cr 2 o 3 but it is often found in nature with magnesia mgo substituting for read more copper
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1346 ambran et a materias research table 1 chemical composition of the materials wt components chromite ore petroleum coke fesi sodium silicate bentonite cr 2 o 3 412 feo 169 73 sio 2 57 276 557
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Carried out on the carbothermic reduction of chromite ore to elucidate the kinetics and mechanism of the reduction process the influence of different parameters such as time temperature chemical composition addition of carbon particle size of ore and carbon
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Ore and its mineral composition variability in the ore together with upstream process dynamics creates a challenging environment in which to achieve optimal recovery of a gravity concentrate with accurate grade control this paper examines certain interrelational aspects between the ore gangue and chromite mineral types the influence of the
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The variability in texture and composition of chromite due to its primary crystallization and subsequent modification by the development of potholes or through irup intrusions are thought to influence the flotation behaviour of the ug2 main seam chromitite ore
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Chromite the us consumes about 5 percent of world chromite ore production in various forms of imported materials such as chromite ore chromite chemicals chromium ferroalloys chromium metal and stainless steel its used as an alloy in stainless and heat resisting steel products its also used in chemical and metallurgical indus
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The principal ore ischromite a spinel corresponding to the general formula mg fe cr al fe 2o4 and the simplified formula cr2o3 feo chromium is the 13 th most abundant element in the earths crust with an average concentration of the order of 400 ppm 14 million tonnes of marketable chromite ore were produced in 2002 south
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Apr 24 2020nbsp018332chemical composition fecr2o4 with magnesium substituting for iron in significant amounts crystal system isometric uses an ore of chromium properties of chromite chromite can be challenging to identify several properties must be considered to differentiate it from other metallic ores
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Chromite composition fecr20 4 feo 320 per cent cr20 3 680 per cent the iron may be replaced by magnesium and the chromium by aluminum and ferric iron diagnostic features the submetallic luster usually distinguishes chromite but the green borax bead is diagnostic mineral group spinel group crystallography isometric hexoctahedral habit octahedral
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Chromite an oxide mineral is the major ore of chromium it is often used for the bricks and linings of blast furnaces as it can withstand very high temperatures chromite is one of the first minerals to crystallise in deep ultra mafic magmas and becomes concentrated as it sinks to the bottom of the magma chamber
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Chrome ore chromite ore iron chromite chrome sand chromox chromecast 042014 section ii composition chemical name cas percent chrome ore cr2feo4 or cr2o3 1308312 100 section iii health hazard data component cas by wt osha pel mgm3 osha ceiling acgih tlv acgih stel listed carcinogen chrome ore 1308312 100 1 as cr na 005
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Jul 10 2018nbsp018332chromite ore particles do not necessarily have uniform composition since there are variations between ore bodies and even between and within ore seams the chromite ores are generally part of the spinel crystal family having the general formula fe2 mg2oal3cr3fe32o3
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Degree of extraction include chromite ore composition roasting temperature and time oxygen potential and the origin and quantity of gangue materials present in the ore another important factor which is known to have a critical effect on the roasting reaction is the formation of an alkaline molten phase containing chromium
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Section ii composition component synonyms cas by wt chrome ore cr2feo4 or cr2o3 chromite ferrochromite iii chromite cr2feo4 chromite mineral iron chromite 1308312 100 notes typical chemical analysis wt
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Society of economic geologists inc ore deposition associated with magmas contents part i mafic rocks introduction magmatic deposits associated with mafic rocks aj naldrett sulfide melts crystallization temperatures solubilities in silicate melts aj naldrett and fe ni and cu partitioning between basaltic magmas and olivine
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Ore deposits can be classied on the basis of composition of the deposit contained elements form of the deposit size shape orientation and ore mineral distribution associated host rocks or geological structures ore associations interpreted genesis of the deposit processes controls
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