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Paul Heroult (1862-1914), Metallurgist
1886 Inventor of a process for electrolytically reducing refractory ores, especially used in the extraction of aluminium. Charles Martin Hall of Oberlin, Ohio, USA, made a similar discovery at the same time.
Unlike Hall, Heroult devoted most of his attention to the manufactme of alloys; his first French patent described a coal-fired crucible adapted for the preparation of the simple metal; the second one, which was taken up by the Societe Metallurgique Suisse at Neuhausen, claimed a process for actually fusing alumina by means of a powerful electric current, and then electrolysing it in presence of copper to yield aluminium bronze.
1900 Began trials of an electric furnace he had designed for smelting iron ores to make steel; by 1903, 2500 tons of steel had been produced in France using the electric furnace