Extraction and purification of minerals from aluminium ores

C - Chemistry – Metallurgy – 01 – F

Patent

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C01F 7/22 (2006.01) C01F 7/50 (2006.01) C01G 23/02 (2006.01) C01G 23/04 (2006.01) C01G 23/07 (2006.01)

Patent

CA 2633073

A process for obtaining one or more metal fluoride or metal oxide compounds from treatment of a feed material containing aluminium ore, includes the steps of contacting the feed material with a fluorine acid solution to form gaseous silicon fluoride and aqueous soluble metal fluorides and/or metal fluosilicates, processing the aqueous reaction products to form a solid reaction product containing metal fluorides, processing to remove low boiling point compounds and heating said solid reaction product to a temperature to drive off metal fluoride in gaseous form. The feed material may include aluminium ores and/or titanium ores, coal or other carbonaceous materials containing mineral impurities, or other minerals such as mica. Processes for the production of aluminium and titanium compounds are also described.

L'invention concerne un procédé visant à obtenir un ou plusieurs composés de fluorure métallique ou d'oxyde métallique à partir du traitement d'un matériau de départ contenant du minerai d'aluminium. Ledit procédé inclut les étapes consistant à: mettre en contact le matériau de départ avec une solution acide au fluor afin de former du fluorure de silicium gazeux et des fluorures métalliques et/ou fluosilicates métalliques solubles aqueux; traiter les produits réactionnels aqueux pour former un produit réactionnel solide contenant des fluorures métalliques; appliquer un traitement destiné à éliminer les composés à bas point d'ébullition; chauffer ledit produit réactionnel solide à une température permettant le dégagement de fluorure métallique sous forme gazeuse. Le matériau de départ peut inclure des minerais d'aluminium et/ou de titane, du charbon ou d'autres matériaux carbonés contenant des impuretés minérales, ou d'autres minéraux tels que le mica. L'invention concerne également des procédés de production de composés de l'aluminium et du titane.

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