Chromium Ore an overview ScienceDirect Topics
F Habashi, in Encyclopedia of Materials: Science and Technology, 2002 2 Chromium Chromium was discovered in 1797 by the French chemist Louis Nicolas Vauquelin, in a mineral that became known as crocoite, PbCrO 4 A year later, he isolated chromium metal by reducing the oxide with carbon Soon after, the commercial process for manufacturing chromates by roasting chromite with soda ash was Chrome Ore a natural mineral formation containing chromium in such compounds and concentrations as to make its commercial exploitation technically feasible and economically expedient The only chromiumcontaining minerals that provide an industrial source of chromium are the chrome Chrome Ore Article about Chrome Ore by The Free DictionaryChromium 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 electroplatedChromium 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 chromium Uses, Properties, Facts BritannicaChromium (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 VIB of the periodic table with a groundstate electronic configuration of Ar3d5 4s 1 Cr is mined as chromite (FeCr 2 O 4) oreChromium an overview ScienceDirect Topics
Chromium processing Encyclopedia Britannica
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 protective coating for other metals 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 protectivechromium Uses, Properties, Facts BritannicaChromium(pronounced/ˈkroʊmiəm/) is a chemical elementwhich has the symbol Crand atomic number24 It is a steelgray, lustrous, hard metalthat takes a high polish and has a high melting point It is also odourless, tasteless, and malleableChromium chemeuropeChromium surfaces are produced on other metals by electroplating and chromizing There are two types of electroplating: decorative and “hard” Decorative plate varies between 0 and 0 millimetre (000001 and 000002 inch) in thickness and is usually deposited over nickelChromium processing The metal and its alloys BritannicaChromium steel, which resists warping or melting under conditions of extreme heat, is ideal for hightemperature applications such as jetengine components The principle chromium ore, chromite, is heat resistant in the same way It is this property, along with its chemical stability, that makes chromium useful as a refractory materialChromium: A Thoroughly Modern Metal Dartmouth Toxic Metals
Chromite mining The Oregon Encyclopedia
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 emergencyChromium (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 VIB of the periodic table with a groundstate electronic configuration of Ar3d5 4s 1 Cr is mined as chromite (FeCr 2 O 4) oreChromium an overview ScienceDirect TopicsChromium is a mineral that is essential to humans It is found naturally in a variety of foods, and supplements are available in capsules or tablets Supplements are prepared using a number of formulas, including chromium (III), chromium aspartate, chromium chloride, chromium citrate, chromium nicotinate,Periodic Table Of The Elements Chromium EncyclopediaChromium 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 −1Chromium an overview ScienceDirect TopicsVauquelin discovered that chromium compounds can form reds, brilliant yellows, and deep greens, and that traces of chromium were responsible for the green color of a Peruvian emerald and the red of rubies Chromite is a dark dull mineral that forms in igneous environments and is the primary commercial chromium ore In 1798, Lowitz and Klaproth Chromium Oxides an overview ScienceDirect Topics
Chromium chemeurope
Chromium compounds of oxidation state +6 are powerful oxidants Chromium is passivated by oxygen, forming a thin (usually a few atoms thick being transparent because of thickness) protective oxide surface layer with another element such as nickel, and/or iron It forms a compound called a spinal structure which, being very dense, prevents diffusion of oxygen into the underlying layer (In iron or plain carbon Chromium (Cr) is a graywhite, metallic element in group VIB of the periodic tableIt also a transition elementChromium's only commercially important ore is chromite, a mixed oxide of iron and chromium, FeOCr 2 O 3This is reduced to a ferrochromium alloy by carbon or silicon; pure chromium is obtained by reducing chromium (III) oxide with aluminumchromium (Cr) David DarlingArtists also treasured fragments of crocoite for their beautiful, reddish orange color But the ore is too rare to be useful commercially Chromite, the primary commercial ore, was not discovered until 1798 All the Colors of the Rainbow The chromium element was isolated in 1797 by the French chemist Louis Nicholas Vauquelin He named the element from the Greek word for color, “chroma,” because each Chromium: A Thoroughly Modern Metal Dartmouth Toxic MetalsChromium (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 TurkeyPotassium dichromate is produced synthetically and was at one time used at dyeing plants as an oxidising agent for aniline dyes; as a bleaching agent Plant Encyclopaedia Kalium bichromicum (Potassium dichromate)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 In its crustal distribution, it shows a particular preference for ultrabasic and basic rocks and specifically eschews Chromium an overview ScienceDirect Topics
Periodic Table Of The Elements Chromium Encyclopedia
chromium (symbol Cr) Dull grey metal, one of the transition elements, first isolated in 1797 by the French chemist Louis Vauquelin Its chief ore is chromite It is extensively used as an electroplated coating It is also an ingredient of many special steels, such as stainless steel Polished chromium plate (chrome) is used to enhance the look of cars Chromium compounds are used in tanning and dyeing Properties: Encyclopedia gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA) Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style Then, copy and paste the text Chromite EncyclopediaChromite 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 of 1939 Chromite is used as an alloy of steel for hardening Chromite mining The Oregon EncyclopediaVauquelin discovered that chromium compounds can form reds, brilliant yellows, and deep greens, and that traces of chromium were responsible for the green color of a Peruvian emerald and the red of rubies Chromite is a dark dull mineral that forms in igneous environments and is the primary commercial chromium ore In 1798, Lowitz and Klaproth Chromium Oxides an overview ScienceDirect Topicsservice industry chromium ore mining Kenya Mining , the free encyclopedia Mining is the extrac service industry chromium ore mining Kenya Mining , the free encyclopedia Mining is the extraction of valuable minerals or other geological materials from the earth, from an orebody, lode, vein, (coal) seam or reef, which forms the Chromium , the free encyclopedia Chromium is a chemicalThe Free Encyclopedia Mining Is The Extraction Of Valuable
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