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General
- Molybdenum, is a
Group 6 chemical element with the symbol Mo and atomic number 42 .It has
the sixth-highest melting point of any element, and for this reason it
is often used in high-strength steel alloys.
- Molybdenum is found
in trace amounts in plants and animals, although excess molybdenum can
be toxic in some animals.
- Molybdenum was
discovered in 1778 by Carl Wilhelm Scheele and first isolated in 1781 by
Peter Jacob Hjelm.
- Molybdenum is a
transition metal with an electronegativity of 1.8 on the Pauling scale
and an atomic mass of 95.9 g/mole. It does not react with oxygen or
water at room temperature.
Process
- Structure tailoring
of electrodeposited Mo (IV)-oxide thin films by thermal oxidation in
ambient air to obtain electrochromic Mo (VI)-oxide thin films was
exploited for the first time by novel route.
- Electrosynthesis of
Mo (IV)-oxide thin films on Fluorine-doped SnO2 conducting glass
substrates were carried from aqueous alkaline solution of ammonium
molybdate at room temperature.
- A study for the
optimization of dissolution of the UAlx plates used for irradiation and
production of radiomolybdenum. The alloy is dissolved in nitric acid
with mercury as catalyst.
- The separation
and concentration of the molybdenum was achieved using a chromatographic
grade alumina
microspheres column.
Application
- Molybdenum is used in
alloys for its high corrosion resistance and weldability. Most
high-strength steel alloys are .25% to 8% molybdenum.
- More than 43 million
kg of molybdenum is used as an alloying agent each year in stainless
steels, tool steels, cast irons, and high-temperature superalloys.
- Molybdenum 99 is used
as a parent radioisotope to the radioisotope Technetium 99, which is
used in many medical procedures.
- Molybdenum disulfide
is used as a lubricant and an agent. Lead molybdate co-precipitated with
lead chromate and lead sulfate is a bright-orange pigment used with
ceramics and plastics.
Market
- For many years the US
was the world's largest producer of molybdenum, it looked for a time as
though the US might drop to second place behind Chile.
- US has enormous
reserves and substantial copper-molybdenum production capacity that was
placed on standby during the lean years, so the potential was always
present for the US to regain its production supremacy.
- The primary mines are
swing producers, i.e. they increase their production when the market has
higher demand for molybdenum and decrease their production when the
demand is down.
- America that have
traditionally produced the bulk of molybdenum have decreased their
production and have become swing producers these mines are only able to
increase their production, or come back on-stream, when the market
demand requires their more costly molybdenum.
Report
- Molybdenum is a
refractory metallic element used principally as an alloying agent in
steels, cast irons, and superalloys to enhance hardenability, strength,
toughness, and wear and corrosion resistance.
- Almost all molybdenum
is recovered from low-grade deposits containing the mineral molybdenite
. Deposits mined primarily for molybdenum provide 65 percent to 70
percent of U.S. output and about 45 percent of world output.
- The versatility of
molybdenum has assured it a significant role in contemporary technology
and industry, which increasingly requires materials that are serviceable
under ever increasingly higher stresses, greater temperature ranges, and
more corrosive environments.
- Molybdenum does not
occur in nature in its free or native state but is found only chemically
combined with other elements.
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