chromite ore reference

  • Chromite - an overview | ScienceDirect Topics

    In its purest form, chromite ore contains 68% Cr 2 O 3, and Cr:Fe ratio of 1.8:1. Louis Nicolas Vauquelin was the discoverer of the element "chromium," and named the mineral "ferrous-chromate-alumine" in 1798. Later, Wilhelm Haidinger named it "chromite" in 1845 with reference to its extremely high chromium content.

  • Chromium and disease: review of epidemiologic studies with ...

    The relationship between employment in industries producing chromium compounds from chromite ore and lung cancer has been well established in numerous studies. The relationship between exposure to certain chromium-based pigments and chromic acid and .

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  • Conversion of Chromium Ore Processing Residue to Chrome .

    The kinetics of reduction of chromite ore plays an important role in controlling the productivity of the processes and quality of Ferro-chromium. A considerable amount of research has been carried out on the carbothermic reduction of chromite ore to elucidate the kinetics .

  • Chromite | Definition of Chromite at Dictionary

    Chromite definition, a salt of chromium in the bivalent state. See more.

  • What Are the Main Uses of Iron Ore? | Reference

    Iron ore is the main ingredient in steel, which makes up 95 percent of the metals used in the world per year. Two billion metric tons of raw iron ore are produced in a year. The world's largest single producer of iron ore is Brazilian mining company Vale, which produces over 350 million tons of iron ore annually.

  • Chromite dictionary definition | chromite defined

    chromite definition: a hard, black mineral, FeCrO, the chief ore of chromium...

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  • Chromite (Cr2FeO4) | CrFeO4 - PubChem

    Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high levels of hexavalent chromium (Cr[VI]). Although the high temperature chromite process was banned in several countries, its legacy still exists at numerous contaminated sites.

  • Using Peroxide Fusions for the ICP-OES Analysis of ...

    Chromite is an iron chromium oxide mineral (FeCr 2 O 4), which is a source of commercial importance.It contains 68% of chromic oxide (Cr 2 O 3), wherein the proportions of Fe 2+, Fe 3+, Mg 2+, Cr 3+ and Al 3+ may differ significantly. Chromite produces Ferrochrome, which plays a key role in the steel industry.

  • (PDF) Quantitative analysis of chromite ores using glass ...

    Quantitative analysis of chromite ores using glass discs in moderate dilutions of lithium tetraborate by x‐ray fluorescence spectrometry. ... Chrome Ore reference materials were used. Analytical ...

  • Chromite - EVE Online Reference

    An uncommon ore commercially mined from moons, Chromite is quite valuable as it yields good quantities of Chromium, an important element of many advanced materials. Chromite ores will also yield Hydrocarbons, Nocxium, Isogen, Mexallon, and Pyerite.

  • ALPINE-TYPE CHROMITE IN NORTH BORNEO, WITH SPECIAL ...

    Ameriean Mi*eralogist Vol. 57, pp. eas-dSZ irszzl I ALPINE-TYPE CHROMITE IN NORTH BORNEO, WITH SPECIAL REFERENCE TO DARVEL BAY1 Cuenr,ps .

  • FI127031B - Method and arrangement for processing chromite ...

    The arrangement comprises a first feeding arrangement 9 for providing a chromite concentrate feed 1, and a second feeding arrangement 10 comprising at least a first feeding means (not marked with a reference numeral) for adding fluxing agent 2 to the chromite ore feed 1 to obtain a pelletizing feed 12.

  • Standard Reference Materials for Hexavalent Chromium in ...

    Significant environmental remediation efforts are being conducted to address the hazards posed by the long-term terrestrial disposal of hexavalent chromium in the form of chromite ore processing waste. These efforts are being driven by the intended economic re-development of some of these waste sites, and to reduce the environmental impact and associated risk to human health.

  • Chromite | Encyclopedia

    chromite (krō´mīt), dark brown to black mineral.It is an iron-chromium oxide, FeCr 2 O 4, with traces of magnesium and aluminum.Its crystals are octahedral, but rare; it usually occurs as irregular, granular masses in association with igneous rocks, including ophiolites, which are segments of oceanic crust exposed on land by tectonic processes usually associated with plate convergence (see ...

  • Chromite - Wikipedia

    Chromite ore can be mined to produce chromite concentrate. It can also be crushed and processed. Chromite concentrate, when combined with a reductant such as coal or coke and a high temperature furnace can produce ferrochrome. Ferrochrome is a type of ferroalloy that is an alloy in between chromium and iron.

  • Review of Chromite Ore Processing Residue (COPR): Past ...

    Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high levels of hexavalent chromium (Cr[VI]). Although the high temperature chromite process was banned in several countries, its legacy still exists at numerous contaminated sites. For instance, New Jersey alone has over 2 million tons of waste COPR.

  • Chromite - Assignment Point

    Chromite and ilmenite have very similar properties. Careful observations of hardness, streak, and specific gravity are required to distinguish these minerals in hand specimens. Uses of Chromite. Chromite is the mineral ore of the metal Chromium, and the chromium must often be extracted from the ore and purified before it is used.

  • Chromite | Encyclopedia

    chromite (krō´mīt), dark brown to black mineral.It is an iron-chromium oxide, FeCr 2 O 4, with traces of magnesium and aluminum.Its crystals are octahedral, but rare; it usually occurs as irregular, granular masses in association with igneous rocks, including ophiolites, which are segments of oceanic crust exposed on land by tectonic processes usually associated with plate convergence (see ...

    [PDF]
  • Chromium and disease: review of epidemiologic studies with ...

    The relationship between employment in industries producing chromium compounds from chromite ore and lung cancer has been well established in numerous studies. The relationship between exposure to certain chromium-based pigments and chromic acid and .

    [PDF]
  • Peridotite - Credo Reference

    Peridotite ONE OF THE MOST ECONOMICALLY important rocks, peridotite is the ultimate source of all chromium ore, and its variety kimberlite is the source of all naturally occurring diamonds. Fresh peridotite contains olivine, pyroxene, and chromite. Peridotite that has been altered by weathering

  • How Is Chromite Used? | Reference

    Chromite, a mineral ore that is mined from crystallized magma, is used in the production of steel as a pigment and as a catalyst in many chemical reactions. It is also an important component of the leather tanning process. Chromite is also used to anodize aluminum for use in jet engines.

  • Chromite: The mineral Chromite information and pictures

    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 well-represented in mineral collections.

  • Chromite Ore Processing Residue (COPR): Hazardous ...

    Mar 31, 2005 · Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr 6+) at concentrations typically in the range of thousands of milligrams/kilograms, was deposited over a timeframe of 50 years as fill at a site referred to as SA7 in New Jersey.Significant surface heaving associated with COPR weathering-induced mineralogical expansion has been observed at the site .

  • Masinloc Mines (MRDS #10183284) CR - mrdata.usgs.gov

    prior to 1975 consolidated mines incorporated was the only refractory chromite producer in the philippines. 1964 - an aerial tram was installed and ore started to be taken from the government zambia mineral reservation. 1976 - chromite ore production suffered a decline in volume although values increased by about 50%.

  • Chromite Ore Processing Residue (COPR): Hazardous ...

    Mar 31, 2005 · Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr 6+) at concentrations typically in the range of thousands of milligrams/kilograms, was deposited over a timeframe of 50 years as fill at a site referred to as SA7 in New Jersey.Significant surface heaving associated with COPR weathering-induced mineralogical expansion has been observed at the site .

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