chromium ore encyclopedia

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Chromite - definition of chromite by The Free Dictionary

chro·mite (krō′mīt′) n. A widely distributed black to brownish-black chromium ore, FeCr2O4. chromite (ˈkrəʊmaɪt) n 1. (Minerals) a brownish-black mineral consisting of a ferrous chromic oxide in cubic crystalline form, occurring principally in basic igneous rocks: the only commercial source of chromium .

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Ferrochromium | alloy - Encyclopedia Britannica

Ferrochromium, alloy of chromium with 30 to 50 percent iron, used to incorporate chromium into steel. It is produced in an electric furnace using chromium ore, iron or iron ore, and carbon, usually anthracite coal. In the intense heat the carbon reduces the metal oxides to the molten alloy, which

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Chromium - an overview | ScienceDirect Topics

M. Sperling, in Encyclopedia of Analytical Science (Second Edition), 2005. Origin and Nature. Chromium is the seventh most abundant element on earth, most chromium residing in the core and mantle. In the earth's crust chromium ranks 21st, the average concentration being estimated to be 185 mg kg −1, much lower than that for the earth as a whole, estimated to be 3700 mg kg −1.

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chromium - Students | Britannica Kids | Homework Help

Chromium plating has largely replaced nickel plating because of its superior hardness and resistance to chemical action. Heat-resisting chromium alloys are employed for high-temperature chemical apparatus, and the chief chromium ore.

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Identification and Description of Mineral Processing ...

chromium content of the ferrochromium is determined by the chromite ore's chromium to iron ratio.11 The production of low carbon ferrochromium requires Source: Kirk-Othmer Encyclopedia of Chemical Technology, 1993, p. 233.

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Ferrochrome Silicon | Article about ... - Encyclopedia

a ferroalloy composed chiefly of silicon and chromium; it is smelted by carbon reduction of quartzite and of granulated conversion ferrochromium or chromium ore in ore heat-treating furnaces.

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Chromium processing - The metal and its alloys | Britannica

Chromium surfaces are produced on other metals by electroplating and chromizing. There are two types of electroplating: decorative and "hard." Decorative plate varies between 0.000254 and 0.000508 millimetre (0.00001 and 0.00002 inch) in thickness and is usually deposited over nickel.

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Copper (cu) | Encyclopedia

The ore is loaded into giant dump trucks, called haul trucks, and is transported up and out of the pit. Concentrating. The copper ore usually contains a large amount of dirt, clay, and a variety of non .

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Chromium Chloride - an overview | ScienceDirect Topics

Chromium is an important alloying material for steel, and South Africa has maintained the lead in chromium ore production, with ferrochromium and metallic chromium as the two main products of chromium ore refining. Chromates, chromium oxides, and chromium salts have been further used in the pigment and leather tanning industries.

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Chromite | Definition of Chromite by Merriam-Webster

Chromite definition is - a black mineral that consists of an oxide of iron and chromium and is the only chromium ore.

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Chromium Facts for Kids - Kids encyclopedia facts

May 22, 2020· Properties. Chromium is a shiny metal.It is reactive, but it reacts with air to produce a very thin coating of chromium(III) oxide, which prevents it from rusting any more.. Compounds. Chromium occurs in several oxidation states; +2, +3, and +6 are most common.It forms chemical compounds that are colorful.. Chromium(II) oxide, black, rare, reducing agent ...

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Plant Encyclopaedia Kalium bichromicum (Potassium dichromate)

History . Chromium (Cr) was discovered by Vauquelin in 1797. The name chromium comes from the Greek word, chroma meaning 'colour'. Larger deposits of chromium ore, chromite or chromium iron ore can be found in India, South Africa, Russia, New Zealand and Turkey.Potassium dichromate is produced synthetically and was at one time used at dyeing plants as an oxidising agent for aniline dyes ...

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Chromium - AQW

Location: Necropolis Price: N/A (Reward from the 'Hard Core Metals' quest) Sellback: 25 Gold 0 AC Type: Inventory Item Description: This huge hunk of metal has been mined from Raw Ore deposits. Chromium is required for forging items of DoomKnight quality. so hold on to it! Notes: Stacks up to 500 10.; Used in the 'Calamitous Chromium .

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Chromium - AQW

Location: Necropolis Price: N/A (Reward from the 'Hard Core Metals' quest) Sellback: 25 Gold 0 AC Type: Inventory Item Description: This huge hunk of metal has been mined from Raw Ore deposits. Chromium is required for forging items of DoomKnight quality. so hold on to it! Notes: Stacks up to 500 10.; Used in the 'Calamitous Chromium Hex' quest. Thanks to Tendou no Mazo and Van Fanel.

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Chromium | Cr - PubChem

Chromium is a transition element with the chemical symbol Cr and atomic number 24 that belongs to Group 6 of the periodic table.It is used in various chemical, industrial and manufacturing applications such as wood preservation and metallurgy. The uses of chromium compounds depend on the valency of chromium, where trivalent Cr (III) compounds are used for dietary Cr supplementation and ...

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Chromium and Chromium Alloys - Papp - - Major Reference ...

Chromium metal is produced by electrodeposition or aluminothermic reduction of ore. Economic data, specifications, and shipments are discussed. Chromium is a trace mineral required by the human body. Chromium and its compounds are regulated by the EPA and OSHA. Recycled scrap stainless steel is an important source of chromium.

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Chromate and dichromate - Wikipedia

The primary chromium ore is the mixed metal oxide chromite, FeCr 2 O 4, found as brittle metallic black crystals or granules. Chromite ore is heated with a mixture of calcium carbonate and sodium carbonate in the presence of air. The chromium is oxidized to the hexavalent form, .

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Ferrochrome Silicon | Article about ... - Encyclopedia

Ferrochrome Silicon a ferroalloy composed chiefly of silicon and chromium; it is smelted by carbon reduction of quartzite and of granulated conversion ferrochromium or chromium ore in ore heat-treating furnaces. Ferrochrome silicon with 10–46 percent Si (the remainder is Cr, Fe, and impurities) is used in the smelting of low-alloy steel, as well as in ...

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Chromium processing - Encyclopedia Britannica

Chromium processing, preparation of the ore for use in various products. Chromium (Cr) is a brilliant, hard, refractory metal that melts at 1,857 °C (3,375 °F) and boils at 2,672 °C (4,842 °F). In the pure state it is resistant to ordinary corrosion, resulting in its application as an electroplated

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Nickel | Encyclopedia

NICKEL (REVISED) Note: This article, originally published in 1998, was updated in 2006 for the eBook edition. Overview Nickel is the only element named after the devil. The name comes from the German word Kupfernickel, meaning "Old Nick's copper," a term used by German miners.

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Ferrochromium | alloy - Encyclopedia Britannica

Ferrochromium, alloy of chromium with 30 to 50 percent iron, used to incorporate chromium into steel. It is produced in an electric furnace using chromium ore, iron or iron ore, and carbon, usually anthracite coal. In the intense heat the carbon reduces the metal oxides to .

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Chromium and Chromium Alloys - Papp - - Major Reference ...

Chromium metal is produced by electrodeposition or aluminothermic reduction of ore. Economic data, specifications, and shipments are discussed. Chromium is a trace mineral required by the human body. Chromium and its compounds are regulated by the EPA and OSHA. Recycled scrap stainless steel is an important source of chromium.

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Plant Encyclopaedia Kalium bichromicum (Potassium dichromate)

History . Chromium (Cr) was discovered by Vauquelin in 1797. The name chromium comes from the Greek word, chroma meaning 'colour'. Larger deposits of chromium ore, chromite or chromium iron ore can be found in India, South Africa, Russia, New Zealand and Turkey.Potassium dichromate is produced synthetically and was at one time used at dyeing plants as an oxidising agent for aniline dyes ...

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Chromium | Cr - PubChem

Chromium is a transition element with the chemical symbol Cr and atomic number 24 that belongs to Group 6 of the periodic table.It is used in various chemical, industrial and manufacturing applications such as wood preservation and metallurgy. The uses of chromium compounds depend on the valency of chromium, where trivalent Cr (III) compounds are used for dietary Cr supplementation and ...

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Chromium Facts for Kids - Kids encyclopedia facts

May 22, 2020· Properties. Chromium is a shiny metal.It is reactive, but it reacts with air to produce a very thin coating of chromium(III) oxide, which prevents it from rusting any more.. Compounds. Chromium occurs in several oxidation states; +2, +3, and +6 are most common.It forms chemical compounds that are colorful.. Chromium.

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Chromite mining - The Oregon Encyclopedia

Mar 17, 2018· Chromite is a mineral that contains chromium. It is considered a strategic mineral, which generally means that it is necessary for military and industrial use during periods of national emergency. The strategic mineral concept was created during World War I and became law just prior to World War II with the passage of the Strategic Minerals Act ...

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Chromate and dichromate - Wikipedia

The primary chromium ore is the mixed metal oxide chromite, FeCr 2 O 4, found as brittle metallic black crystals or granules. Chromite ore is heated with a mixture of calcium carbonate and sodium carbonate in the presence of air. The chromium .

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Chromium - an overview | ScienceDirect Topics

Chromium (Cr) was discovered in the Siberian red lead ore (crocoite) in 1798 by the French chemist Vauquelin. It is a transition element placed in the group VI-B of the periodic table with a ground-state electronic configuration of Ar3d5 4s 1. Cr is mined as chromite (FeCr 2 O 4) ore.

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Chromite | Article about chromite by The Free Dictionary

(krō`mīt), dark brown to black mineral. It is an iron-chromium oxide, FeCr2 O 4, with traces of magnesium and aluminum.

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Plant Encyclopaedia Kalium bichromicum (Potassium dichromate)

History . Chromium (Cr) was discovered by Vauquelin in 1797. The name chromium comes from the Greek word, chroma meaning 'colour'. Larger deposits of chromium ore, chromite or chromium iron ore can be found in India, South Africa, Russia, New Zealand and Turkey.Potassium dichromate is produced synthetically and was at one time used at dyeing plants as an oxidising agent for aniline dyes ...

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