Chromium is extracted from its most important ore, chromite, through a process that involves crushing the ore, separating it using gravity and magnetic techniques, and then oxidizing the concentrated chromium through suspension in a molten salt bath with an oxygen-containing gas to convert the chromium into soluble chromates that can be extracted through leaching. Chromium has many industrial uses including as a pigment, in producing stainless steel through alloying with steel, and for plating metals to increase hardness and corrosion resistance. The document provides details on chromite ore processing and extraction of chromium through oxidation and leaching of the resulting chromates.

1. Chromium Ore
How is chromium extracted from its important
ore?

2. 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.

3. Uses of Chromium
● 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.
● 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."

4. 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.

5. 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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