Extraction of Aluminium: Metallurgy - 03 For Class 12th

13 Nov 2013 20:45 4
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Aluminium is mainly isolated from bauxite ore which is generally contaminated with ferric oxide and silica. The removal of ferric oxide and silica from bauxite ore is essential before it is subjected to electrolysis. Thus, the extraction of aluminium from bauxite ore involves the following three steps:

(i) Purification of bauxite ore, i.e., removal of ferric oxide and silica.

a) Baeyer’s process: This process is mainly applied to bauxite ore containing ferric oxide as chief impurity.

b) Hall’s process: This process is mainly applied to bauxite ore containing ferric oxide as a chief impurity.

c) Serpeck’s process: This process is mainly applied to bauxite ore containing silica as a chief impurity.

(ii) Electrolytic reduction of Al2O3

(iii) Electrolytic purification of aluminium.

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