“…First, bauxite transforms into alumina by means of several treatments of milling, digestion, dissolution, filtering, refrigeration, precipitation, and drying (Bayer process). In a second step, alumina is converted into aluminum metal by an electrolytic procedure (Hall‐Héroult process) 1,2 . The worldwide production of primary aluminum has passed from 2 t/year to 60·10 6 t/year in the last century.…”