C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 7/00 (2006.01) A62D 3/30 (2007.01) C22B 21/00 (2006.01) C22B 26/20 (2006.01) C01B 7/19 (2006.01) C01B 9/08 (2006.01) C01B 33/08 (2006.01) C01B 33/12 (2006.01) C01C 3/00 (2006.01) C03C 1/00 (2006.01) C04B 7/24 (2006.01) C04B 18/04 (2006.01)
Patent
CA 2365855
A process of treating spent potliner material from aluminum reduction cells and recovering useful products. In the process of the present invention, spent potliner material is introduced into an acid digester containing, for example, sulfuric acid. As a result of this step, a gas component is produced which includes hydrogen fluoride, silicon tetrafluoride and hydrogen cyanide. Also, a slurry component is produced which includes carbon, a refractory material including silica, alumina, sodium compounds such as sodium sulfate, aluminum compounds such as aluminum sulfate, iron compounds such as iron sulfate, magnesium and calcium compounds such as magnesium and calcium sulfate. The slurry component remains in the digester after the gas component is removed. The gas component is recovered and heated to an effective amount to convert or decompose the silicon tetrafluoride to fumed silica, hydrogen cyanide to a remaining gas component.
L'invention porte sur un procédé de traitement de la brasque usée des cuves de réduction d'aluminium et de récupération des produits utiles consistant à introduire ladite brasque dans un digesteur à l'acide contenant par exemple de l'acide sulfurique ce qui produit un composant gazeux contenant du fluorure d'hydrogène, du tétrafluorure de silicium et du cyanure d'hydrogène ainsi qu'une boue comportant du carbone et un matériau réfractaire comprenant de la silice, de l'alumine, des composés sodiques tels que du sulfate de soude, des composés ferreux tels que du sulfate de fer et des composés magnésiques et calciques tels que les sulfates de magnésium et de calcium. Les constituants de la boue restent dans le digesteur après extraction des composants gazeux. Les composants gazeux sont récupérés et chauffés jusqu'à la température de conversion ou de décomposition du tétrafluorure de silicium en silice sublimée et du cyanure d'hydrogène en un composant gazeux formant le reliquat.
Barnett Robert J.
Mezner Michael B.
Goldendale Aluminum Company
Marks & Clerk
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