Consider the comprehensive flow sheet for Aluminium extraction. Red bauxite undergoes Baeyer's process to yield purified Alumina. This Alumina is then subjected to Hall-Heroult electrolysis. Finally,

Question

Consider the comprehensive flow sheet for Aluminium extraction. Red bauxite undergoes Baeyer's process to yield purified Alumina. This Alumina is then subjected to Hall-Heroult electrolysis. Finally, if ultra-pure Aluminium ($99.98\%$) is required, which specific electrolytic refining process is employed?

Prashant Kotian · Accepted Answer

Correct answer: A. In the metallurgy of Aluminium, the initial extraction yields ~99.8% pure Al. For ultra-purification, Hoope's process is utilized. It involves a three-layer electrolytic cell where the bottom layer is an alloy of impure Al + Cu (anode), the middle is a molten fluoride electrolyte, and the top layer is pure molten Al (cathode).

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