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Keywords:

  • alumina production;
  • bauxite ores;
  • electrolysis;
  • sodium carbonate;
  • sustainable chemistry
Thumbnail image of graphical abstract

Efficiency doubles: The electrolysis of sodium carbonate generates concentrated caustic soda for bauxite ore digestion, sodium bicarbonate for aluminum hydroxide precipitation, and hydrogen and oxygen for the hydroxide calcination. Consequently, an efficient and sustainable production process of alumina from bauxite is proposed and the overall production efficiency is increased by 111 % as compared with the Bayer process (see picture).