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Electrolysis of molten ore

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by

Chloe Lam

on 20 January 2014

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Transcript of Electrolysis of molten ore

extraction of aluminium from bauxite
electrolysis
aluminium oxide aluminium + oxygen

purification of copper

The positive electrode is
made of impure copper
and the negative
electrode is made of a thin
piece of pure copper
.






Electrolysis of molten ore
of molten ore
an important stage in the separation of pure metal from ores
a method of using a direct electric current to drive an otherwise non-spontaneous chemical reaction
how it works
Each electrode attracts ions that are of the opposite charge. Positively charged ions move towards the negative electrode (cathode), whereas negatively charged ions move towards the positive electrode (anode).
examples
Ore?
An ore is a mineral from which a valuable constituent, usually a metal, can be profitably mined or extracted.

It is typically a compound of the metal, mixed with other minerals and impurities.

Group 8
Gladys Faan (5)
Tiffany Ki (8)
Cherri Kwok (10)
Chloe Lam (13)
molten ore?
made liquid by heat
electrolysis
key components
An electrolyte
2 electrodes
A direct current supply
Any molten or dissolved material in which the liquid contains free moving ions is called the
electrolyte
, it conducts electricity.
An
electrode
is an electrical conductor which provides a physical link between the external circuit (the energy supply) and the electrolyte
The

direct current
provides energy to the free ions so that they can move around.
how it works
Non-metal
ions are
negatively
charged and are therefore separated from the
positively
charged
metal
ions.
The energy required to cause the ions to migrate to the electrodes is provided by the direct current from the circuit.
If the ions are not
mobile
, as in a
solid
salt, electrolysis
cannot
occur.
Thus, the ores are
molten
so that the ions are
free to move
to the electrodes.
Full transcript