- Bauxite Ore Processing:
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- Aluminum is found in varying amounts in nature as aluminosilicates
(contains aluminum, silicon, and oxygen) in various types of
clay. As the minerals are weathered they gradually breakdown
into various forms of hydrated aluminum oxide, Al2O3.xH2O,
known as bauxite.
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- The bauxite is purified by the Bayer Process. First
the ore is mixed with a hot concentrated solution of sodium hydroxide.
The NaOH will dissolve the oxides of aluminum and silicon but
not other impurities such as iron oxides, which remains insoluble.
The insoluble materials are removed by filtration.
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- The solution which now contains the oxides of aluminum and
silicon are next treated by bubbling carbon dioxide gas through
the solution. Carbon dioxide forms a weak acid solution of carbonic
acid which neutralizes the sodium hydroxide from the first treatment.
This neutralization selectively precipitates the aluminum oxide,
but leaves the silicates in solution. Again filtration is used
for the separation. After this stage the purified aluminum oxide
is heated to evaporate the water.
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- Aluminum in the metal form is very difficult to obtain by
using some of the traditional chemical methods involving carbon
or carbon monoxide as reducing agents to reduce the aluminum
ions to aluminum metal. One of the earliest and costly methods
in 1850 was to reduce aluminum chloride with sodium metal to
obtain aluminum metal and sodium chloride. (Sodium metal is not
easy to obtain either). As a result some of the earliest aluminum
metal was made into jewelry.
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- Hall-Heroult Process:
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- In 1886, Charles Hall, an American (23 yrs. old), and Paul
Heroult, a Frenchmen (23 yrs old), simultaneously and independently
developed the process still in use today to make aluminum metal.
The purified aluminum oxide is mixed with cryolite, a mixture
of sodium fluoride and aluminum fluoride, and heated to about
980 degrees Celsius to melt the solids. The mixture melts at
a much lower temperature than aluminum oxide would by itself.
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- The hot molten mixture is electrolyzed at a low voltage of
4-5 volts, but a high current of 50,000-150,000 amps. Aluminum
ions are reduced to aluminum metal at the cathode (the sides
and bottom of the electrolysis cell). At the anode, oxygen is
produced from the oxide ions. The anode material is carbon in
the form of graphite, which also is oxidized and must be replaced
quite frequently.
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- The electricity used to produce aluminum is relatively high.
One pound of aluminum requires 6-8 kilowatt-hours of electrical
energy. This amount of aluminum can be used to make 23 pop cans
or one 300 watt light bulb burning for one hour is required to
make one pop can.
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