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1. WO2000036186 - METHOD FOR PRODUCING HIGH PURITY PRIMARY METAL OF ALUMINUM

Publication Number WO/2000/036186
Publication Date 22.06.2000
International Application No. PCT/JP1999/004907
International Filing Date 09.09.1999
IPC
C25C 3/06 2006.01
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
CPROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
3Electrolytic production, recovery or refining of metals by electrolysis of melts
06of aluminium
C25C 3/12 2006.01
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
CPROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
3Electrolytic production, recovery or refining of metals by electrolysis of melts
06of aluminium
08Cell construction, e.g. bottoms, walls, cathodes
12Anodes
CPC
C01F 7/46
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
7Compounds of aluminium
02Aluminium oxide; Aluminium hydroxide; Aluminates
46Purification of aluminium oxide, aluminium hydroxide or aluminates
C25C 3/125
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
CPROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
3Electrolytic production, recovery or refining of metals by electrolysis of melts
06of aluminium
08Cell construction, e.g. bottoms, walls, cathodes
12Anodes
125based on carbon
C25C 3/18
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
CPROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
3Electrolytic production, recovery or refining of metals by electrolysis of melts
06of aluminium
18Electrolytes
Applicants
  • NIPPON LIGHT METAL CO., LTD. [JP]/[JP] (AllExceptUS)
  • UCHIDA, Hiroshi [JP]/[JP] (UsOnly)
Inventors
  • UCHIDA, Hiroshi
Agents
  • ISHIDA, Takashi
Priority Data
10/35864317.12.1998JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) METHOD FOR PRODUCING HIGH PURITY PRIMARY METAL OF ALUMINUM
(FR) PROCEDE DE PRODUCTION D'UN METAL PRIMAIRE D'ALUMINIUM D'UNE GRANDE PURETE
Abstract
(EN)
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.
(FR)
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 °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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