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  Encyclopedia of Keywords > Natural Resources > Minerals > Metals > Molybdenum > Rhenium   Michael Charnine

Keywords and Sections
RHENIUM FORMS
RHENIUM SULFIDE
COPPER-SULFIDE ORES
NATURALLY OCCURRING RHENIUM
GROUP
PRESENCE
CHEMISTRY
EXPENSIVE
THOUGHT
COMMERCIALLY
HYDROGENATION
DUCTILE
BY-PRODUCT
STABLE
STABLE ISOTOPE
ISOTOPES
HYDROGEN
ELEVATED TEMPERATURES
METAL
SILVERY-WHITE
SMALL AMOUNTS
PLATINUM ORES
PPB
MOLYBDENITE
COMPOUND
COMPOUNDS
MELTING POINT
ALLOYS
CATALYST
PALLADIUM
PLATINUM
ELEMENTS
PERIODIC
MANGANESE
RHODIUM
ELEMENT
CHEMICAL PROPERTIES
STABLE ISOTOPES
TECHNETIUM
TANTALUM
OSMIUM
TUNGSTEN
MOLYBDENUM
RHENIUM
Review of Short Phrases and Links

    This Review contains major "Rhenium"- related terms, short phrases and links grouped together in the form of Encyclopedia article.

Definitions

  1. Rhenium is a silvery white metal, lustrous, and has one of the highest melting points of all elements, exceeded by only tungsten and carbon.
  2. Rhenium is a chemical element in the periodic table that has the symbol Re and atomic number 75.
  3. Rhenium is a fairly dense, soft metal, which is next to osmium on the periodic table of chemical elements.
  4. Rhenium is a precious metal that is not part of the platinum group or one of the traditional precious metals.
  5. Rhenium is a byproduct of refining molybdenum from copper ores.

Rhenium Forms

  1. Rhenium forms a superconductive alloy with molybdenum.

Rhenium Sulfide

  1. Rhenium sulfide is associated with molybdenum in the ores.

Copper-Sulfide Ores

  1. Commercial rhenium is extracted from molybdenum roaster-flue gas obtained from copper-sulfide ores.

Naturally Occurring Rhenium

  1. Actually, naturally occurring rhenium is composed of 2 stable isotopes and 26 unstable ones.

Group

  1. Situated in Group 7 of the periodic table, it is expected to have properties similar to those of the rare metal rhenium.

Presence

  1. However, later analysis indicated the presence of rhenium (element 75), not element 43.

Chemistry

  1. The chemistry of technetium is said to be similar to that of rhenium.

Expensive

  1. Rhenium diboride can be produced at ambient pressures, but is rather expensive because of rhenium.

Thought

  1. Rhenium was originally thought to form the rhenide anion, Re −, in which it has the −1 oxidation state.
  2. It is thought to be chemically similar to the rare metal rhenium.

Commercially

  1. Commercially, rhenium is obtained through the processing of copper-sulfide ores that contain molybdenum.

Hydrogenation

  1. Rhenium catalysts are exceptionally resistant to poisoning from nitrogen, sulfur, and phosphorus, and are used for hydrogenation of fine chemicals.

Ductile

  1. Annealed rhenium is very ductile and can be bent, coiled, or rolled.

By-Product

  1. Rhenium resembles manganese chemically and is obtained as a by-product of molybdenum and copper refinement.

Stable

  1. Technetium also shows a stable +IV state whilst rhenium portrays stable +IV and +III states.
  2. Naturally occurring rhenium is 37.4% 185 Re, which is stable, and 62.6% 187 Re, which is unstable but has a very long half-life (~10 10 years).

Stable Isotope

  1. Naturally occurring rhenium is a mix of one stable isotope and one radioactive isotope with a very long half-life.

Isotopes

  1. The reaction also produced isotopes of its lighter homologues, technetium (as 108 Tc) and rhenium (as 169 Re).

Hydrogen

  1. Rhenium is produced by reducing APR with hydrogen.

Elevated Temperatures

  1. In this purification, the molybdenum occurs as a sulfurous sludge, which, at elevated temperatures, releases rhenium.

Metal

  1. Rhenium metal is obtained as a powder by reduction of its compounds with hydrogen.
  2. Rhenium metal is prepared by reducing ammonium perrhentate with hydrogen at elevated temperatures.
  3. The only metal we could find that had the potential for doing this is rhenium; hence, we made rhenium diboride.

Silvery-White

  1. Rhenium is silvery-white in appearance.

Small Amounts

  1. Since rhenium and its compounds are used in very small amounts, very little is known about their toxicity.

Platinum Ores

  1. Rhenium was discovered as a trace element in the mineral columbite and in platinum ores.

Ppb

  1. With an average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust.

Molybdenite

  1. As it is always present in small varying quantities in molybdenite the only commercial source for rhenium are molybdenum mines.
  2. Thus, while molybdenite and rhenium sulfide strongly absorb microwaves and become heated, molybdenum oxide is largely transparent to microwaves.

Compound

  1. Rhenium does not occur free in nature or as a compound in a distinct mineral species.
  2. It is a compound noted for its extreme hardness.[7][8] Isotopes of rhenium are radioactive.

Compounds

  1. A number of rhenium compounds are known, among them halides, oxides, and sulfides.
  2. So far, only a few rhenium compounds have been tested for toxicity, and these include rhenium trichloride and potassium perrhenate.
  3. Rhenium occurs with valences between +1 and +7 in compounds, as well as -1 and -3, but the oxidation states +7, +6, +4, +2 and -1 are the most common.

Melting Point

  1. The element has a melting point exceeded only by tungsten and rhenium.

Alloys

  1. A silvery-white, rare, heavy, polyvalent transition metal, rhenium resembles manganese chemically and is used in some alloys.

Catalyst

  1. The catalyst for use herein preferably contains at least one of rhenium and silver.

Palladium

  1. For certain reactions, for example the dehydrogenation of isopropyl alcohol, it is a far more effective catalyst than either rhenium or palladium.

Platinum

  1. Sometimes platinum is combined with a second catalyst (bimetallic catalyst) such as rhenium or another noble metal.

Elements

  1. The hazardous property of rhenium halide, for example, may be attributed either to rhenium itself or to the other elements that make up the compound.

Periodic

  1. In the periodic table of elements, rhenium is found as a third-row transition metal in group 7.
  2. As the metal, there may be mentioned metals belonging to Group 8 to Group 10 of the Periodic Table and rhenium.
  3. Rhenium, element 75 on the periodic table, belongs to the cluster of elements known as the transition group of elements.

Manganese

  1. Technetium is placed in the seventh group of the periodic table, between rhenium and manganese.
  2. The chemistry of rhenium is similar to manganese.

Rhodium

  1. Above all, ruthenium, rhodium, palladium, iridium, platinum and rhenium are preferred.
  2. However, the price of rhenium has been fluctuating wildly recently and at the moment it is selling at 6,650 USD per ounce, just below rhodium.

Element

  1. Re, chemical symbol - Re Re, symbol for the element rhenium.
  2. Rhenium has the widest range of oxidation states of any known element: -3, -1, 0, +1, +2, +3, +4, +5, +6 and +7.
  3. Rhenium has a stable isotope, rhenium-185, which nevertheless occurs in minority abundance, a situation found only in one other element (indium).

Chemical Properties

  1. Chemical properties of this element are intermediate between rhenium and manganese.
  2. The chemical properties of this silvery grey, crystalline transition metal are intermediate between rhenium and manganese.

Stable Isotopes

  1. Since rhenium was discovered in 1925,[ 22] hafnium was the next to last element with stable isotopes to be discovered.
  2. This find made rhenium the last identified naturally occurring precious metal with stable isotopes.
  3. Natural rhenium is a mixture of one stable and one radioactive isotope of very long half-life, although most sources report two stable isotopes.

Technetium

  1. At the Paul Scherrer Institute in Switzerland, it was shown that bohrium is a group 7 element, the big brother of rhenium, technetium, and manganese.
  2. Technetium resembles platinum in appearance and manganese and rhenium in chemical behaviour.
  3. Like rhenium and palladium, technetium can serve as a catalyst.

Tantalum

  1. Rhenium has a high melting point and a low vapor pressure similar to tantalum and tungsten, however, rhenium forms no volatile oxides.
  2. The primary decay products before W-184 are element 73 (tantalum) isotopes, and the primary products after are element 75 (rhenium) isotopes.

Osmium

  1. In the periodic system, rhenium lies between tantalum (a refractory metal), and osmium, iridium and platinum (platinum group metals).
  2. The histories of these xenoliths have been investigated by many methods, including analyses of abundances of isotopes of osmium and rhenium.
  3. In geochemist's lingo, osmium is a compatible element while rhenium is strongly incompatible.

Tungsten

  1. Of the more easily obtainable ones, only osmium (22.6), iridium (22.4), platinum (21.45), rhenium (21.0) and tungsten (19.35) are denser than gold (19.32).
  2. Tantalum has an extremely high melting point, exceeded only by osmium, rhenium and tungsten, and is also very dense.
  3. Tantalum's high melting point of 3017 °C (boiling point 5458 °C) is exceeded only by tungsten and rhenium for metals, and carbon.

Molybdenum

  1. HuNan HighTech Special Metals - Manufacturer and exporter of tantalum, niobium, tungsten, molybdenum, rhenium and indium metal products from China.
  2. It is preferred that the sulfides of molybdenum and rhenium be dried prior to reaction with microwaves.
  3. Molybdenum and rhenium are the elements most commonly observed with this bonding configuration.

Rhenium

  1. There are nine known precious metals - gold, platinum, iridium, palladium, osmium, silver, rhodium, ruthenium, and rhenium.
  2. The chemical properties of rhenium are like those of technetium, the element above it in Group 7 of the periodic table.
  3. It has a melting point of 2623°C, and only tantalum, osmium, rhenium and tungsten have higher melting points.

Categories

  1. Natural Resources > Minerals > Metals > Molybdenum
  2. Natural Resources > Minerals > Metals > Osmium
  3. Nature > Chemistry > Chemical Elements > Technetium
  4. Encyclopedia of Keywords > Nature > Chemistry > Tungsten
  5. Chemical Properties
  6. Books about "Rhenium" in Amazon.com

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  Originally created: May 07, 2008.
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