Uses of decomposition in metallurgy.

 electrolytic decomposition used in metallurgy
An example is the extraction of aluminum from bauxite. 
The reaction is given as under: 

2Al2O3 --> 4Al + 3O2 

Electrolytic decomposition reaction is the one in which electric current is passed through a solution of an electrolyte and the electric current splits the compound into its constituent atoms. 
Hope that helps.
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