extraction of metals extraction of aluminium -

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extraction of metals extraction of aluminium - Metals can be extracted from their ores by electrolysis. Electrolysis is an expensive method and is used to extract very reactive metals such as aluminium, calcium and sodium. extraction of aluminium aluminium is extracted from its ore, bauxite (Al2O3). giant crucible for holding molten aluminium molten Al2O3 and cryolite + to electric power supply - steel tank lined with carbon carbon electrodes molten aluminium produced from the decomposition of Al2O3 industrial electrolysis of aluminium

extraction of metals extraction of aluminium 2O2-(l) O2(g) + 4e- the electrolyte is molten aluminium oxide and molten cryolite electrolyte contains Al3+ and O2- ions at the anode, O2- ions are discharged as O2 gas; O2 burns away the carbon anodes; C electrodes must be replaced 2O2-(l) O2(g) + 4e- at the cathode, Al3+ ions are discharged as molten aluminium; collected in a crucible Al3+(l) + 3e- Al(l) overall reaction 2Al2O3(l) 4Al(l) + 3O2(g)