Chromium Ore

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Chromium Ore

• How is chromium extracted from its important ore?

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What is Chromium

• Chromium's name comes from the Greek word
  "chroma" which means "color."
• Chromium is a chemical element.
• Its symbol is Cr and atomic number is 24.
• It is a steely-grey, lustrous, hard and brittle
  transition metal.
• Chromium is also highly valued as a metal that is
  able to be highly polished while resisting
  tarnishing.

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Uses of Chromium

• Chromium is a metal used to induce hardness,
  toughness, and chemical resistance in steel.
• Thin coatings of chromium alloys are used as
  platings on auto parts, appliances, and other
  products. These are given the name "chrome
  plated."
• Chromium is a metal used to induce hardness,
  toughness, and chemical resistance in steel. The
  alloy produced is known as "stainless steel."

• Chromium is used as a pigment in paint, ink, dye
  Cosmetics.
• The familiar yellow lines painted down the center
  of highways and the yellow paint used on school
  buses are often "chrome yellow" - a color
  produced from chromium pigment.

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Chromite Ore Processing

• Low-grade ore obtained from an open cut trench at
  a chromite deposit near Auburn, Calif., was
  treated in the laboratory using gravity-magnetic
  separation and flotation beneficiation
  techniques. Flotation using known methods,
  however, gave very poor results and will not be
  discussed further in this report. Tabling of the
  ore followed by upgrading the tabled chromite
  concentrate using magnetic separation to remove
  magnetite gave far superior results. The results
  and discussion of gravity-magnetic separation
  tests on the Auburn ore follow.

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How is chromium extracted from its important ore?

• Process of extracting chromium from a chromium
  ore or concentrate by oxidation, which comprises
  suspending the chromium ore or concentrate in a
  bath of molten salts and introducing an
  oxygen-containing gas into the suspension in a
  sufficient amount and for a sufficient amount of
  time to oxidize chromium therein.
• A process for extracting chromium in the form of
  a chromate from ore or concentrate by the
  suspension oxidation thereof to the chromate
  state which comprises suspending finely crushed
  ore or concentrate containing the chromium in a
  molten liquid bed of an alkali metal salt in the
  ratio of 1 part by weight of ore to 5 to 20 parts
  by weight of salt subjecting the suspension to
  agitation with an oxygen-containing gas at a
  temperature and for a time sufficient to convert
  the chromium to alkali metal chromates and
  leaching with water to separate out the water
  soluble chromates from insoluble residue.

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