Method of producing highly pure aluminum primary base metal

C - Chemistry – Metallurgy – 25 – C

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C25C 3/06 (2006.01) C25C 3/12 (2006.01)

Patent

CA 2321000

A method for producing a high purity primary metal of aluminum which comprises charging, as a main material, an alumina having been reduced with respect to Si content by a washing treatment with an acid into an electrolytic smelting furnace of Hall-Hercult type, and, in tandem with this, using a deashing coke and/or pitch as a carbon material for an anode. In the washing with an acid, use is made of an aqueous solution of sulfuric acid, an aqueous solution containing sulfuric acid and hydrofluoric acid, or the like, and an acidic aqueous solution warmed up to 40 °C or higher is preferably used for removing Si. The use of this method leads to the production of a high purity primary metal of aluminum having markedly reduced contents of Si and Fe, and thus to the production of a high purity primary metal of aluminum having a purity of 99.95 wt % (3N5) or higher, further of that having a purity near the purity 4N of a secondarily refining metal.

Un procédé de production d'un métal primaire d'aluminium d'une grande pureté consiste à charger, en tant que matière principale, une alumine dont on a réduit la teneur en Si au moyen d'un traitement de lavage avec un acide dans un four de fusion électrolytique du type Hall-Hercult, et, en tandem avec ceci, à l'aide d'un coke de décendrage et/ou d'une poix servant de matière carbonée pour une anode. Pendant le lavage avec un acide on utilise une solution aqueuse d'acide sulfurique, une solution aqueuse contenant de l'acide sulfurique et de l'acide fluorhydrique, ou autre; et une solution aqueuse acide chauffée jusqu'à 40 DEG C ou plus est de préférence utilisée pour éliminer le Si. L'utilisation de ce procédé permet de produire un métal primaire d'aluminium d'une grande pureté ayant des teneurs significativement réduites en Si et en Fe, et permet par conséquent de produire un métal primaire d'aluminium d'une grande pureté ayant une pureté de 99,95 % en poids (3N5) ou plus, outre le fait que sa pureté est voisine de la pureté 4N d'un métal à affinage secondaire.

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