Recovery of products from non-metallic products derived from...

C - Chemistry – Metallurgy – 01 – F

Patent

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C01F 1/00 (2006.01) C01F 5/00 (2006.01) C01F 5/14 (2006.01) C01F 7/00 (2006.01) C01F 7/16 (2006.01) C01F 7/20 (2006.01) C22B 7/00 (2006.01) C22B 7/04 (2006.01) C22B 21/00 (2006.01) C22B 26/22 (2006.01)

Patent

CA 2321305

A process for recovering one of alumina hydrate, magnesium hydroxide and magnesium aluminate spinel (MgAl2O4) from aluminum dross wherein the dross is processed to a non-metallic product (NMP). The dross may contain fluxing salts which are removed in providing the NMP. The NMP may be derived from aluminum dross which does not contain fluxing salts sometimes referred to as white dross. The process comprises digesting the non-metallic product with an acid selected from the group consisting of sulfuric, hydrochloric, hydrofluoric and phosphoric acid or mixtures thereof to provide a slurry containing dissolved alumina, magnesia and a solid component, for example, containing magnesium aluminate spinel. Instead of an acid, a base such as sodium hydroxide may be used. The slurry is filtered to separate the solid component from the liquid containing dissolved constituents such as alumina and magnesia to recover the solid component.

L'invention concerne un procédé de récupération d'hydrate d'aluminium, d'hydroxyde de magnésium et de spinelle d'aluminate de magnésium (MgAl2O4) à partir de scories d'aluminium, dans lequel les scories sont traitées de façon à obtenir un produit non métallique (NMP). Les scories peuvent contenir des sels de fondant dont l'élimination permet d'obtenir le NMP. Le NMP peut être dérivé de scories d'aluminium qui ne contiennent pas de sels de fondant, parfois appelées scories blanches. Le procédé comporte l'étape consistant à faire digérer le produit non métallique dans un acide sélectionné dans le groupe comprenant les acides sulfurique, chlorhydrique, fluorhydrique et phosphorique ou des mélanges de ceux-ci, afin d'obtenir une boue contenant de l'aluminium et de la magnésie dissoutes, et un élément solide tel que, par exemple, de la spinelle d'aluminate de magnésium. Au lieu d'un acide, on peut utiliser une base telle que de l'hydroxyde de sodium. La boue est filtrée pour séparer l'élément solide du liquide contenant des constituants dissous tels que de l'aluminium et de la magnésie, afin de récupérer l'élément solide.

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