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In the second stage sodium hydroxide solution is added, which dissolves the sodium aluminate, leaving the impurities as a solid residue. The amount of sodium hydroxide solution needed depends upon the amount of silica present in the raw material. The solution is filtered off; carbon dioxide is bubbled through the solution, causing aluminium hydroxide to precipitate, leaving a solution of sodium carbonate. The latter can be recovered and reused in the first stage.
The aluminium hydroxide is calcined to produce alumina.
The process was used in France at Saindres until 1923 and in Germany and Great Britain until the outbreak of the Second World War .
It has now been replaced by the Bayer process.
 G.A. Baudart in «Histoire française de l'alumine», Revue de l'aluminium, n°217, janvier 1955, page 35.
Translated from the French Wikipedia article "Extraction de l'alumine".
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Deville_process". A list of authors is available in Wikipedia.|