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2010-10-30T14:33:58+01:00
2010-12-08T03:40:21+01:00
Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0185550-A3-19890322
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EP-0185550-A3-19890322
Crude tantalum is dissolved in an aqueous hydrofluoric acid containing solution to forr tantalum-fluorine complex anions which are then extracted into an organic solvent solution of a water-insoluble quaternary ammonium compound having great affinity for the tantalum anions. The organic solution is next washed with an aqueous solution containing an inorganic acid and/or an ammonium salt to remove impurities extracted with the tantalum. Tantalum hydroxide precipitated by subsequent treatment with aqueous ammonia is recovered and calcined to yield tantalum pentoxide having a purity of five or six nines.
Crude tantalum is dissolved in an aqueous hydrofluoric acid containing solution to forr tantalum-fluorine complex anions which are then extracted into an organic solvent solution of a water-insoluble quaternary ammonium compound having great affinity for the tantalum anions. The organic solution is next washed with an aqueous solution containing an inorganic acid and/or an ammonium salt to remove impurities extracted with the tantalum. Tantalum hydroxide precipitated by subsequent treatment with aqueous ammonia is recovered and calcined to yield tantalum pentoxide having a purity of five or six nines.
en
European Patent Office
EP0185550
EP 0185550
C22B 34/24
C22B 34/00
C01G 35/00
Method of purifying tantalum
Method of purifying tantalum - European Patent Office - EP 0185550 A3
Method of purifying tantalum - European Patent Office - EP 0185550 A3
Adobe PDF Library 8.0
"EP0185550"; "EP 0185550"; "C22B 34/24"; "C22B 34/00"; "C01G 35/00"; "Method of purifying tantalum"
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0185550
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1989-03-22
85309238
1985-12-18
JP
26702984
1984-12-18
C22B 34/24
C22B 34/00
C01G 35/00
SUMITOMO CHEMICAL COMPANY, LIMITED
Niwa, Kenji
Ichikawa, Ichiro
DELETED Moore, Anthony John (GB)R. 102(1)26.01.1996 et al
Method of purifying tantalum
Verfahren zur Reinigung von Tantal
Method of purifying tantalum
Procédé de purification du tantale
Crude tantalum is dissolved in an aqueous hydrofluoric acid containing solution to forr tantalum-fluorine complex anions which are then extracted into an organic solvent solution of a water-insoluble quaternary ammonium compound having great affinity for the tantalum anions. The organic solution is next washed with an aqueous solution containing an inorganic acid and/or an ammonium salt to remove impurities extracted with the tantalum. Tantalum hydroxide precipitated by subsequent treatment with aqueous ammonia is recovered and calcined to yield tantalum pentoxide having a purity of five or six nines.
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