C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 34/24 (2006.01) B22F 9/20 (2006.01) C01G 33/00 (2006.01) C01G 35/00 (2006.01) C22B 5/18 (2006.01) C22C 1/04 (2006.01) C22C 27/02 (2006.01)
Patent
CA 2285786
The process comprises the reduction of niobium and/or tantalum oxides by means of alkaline earth metals and/or rare earth metals, wherein the first reduction stage is carried out as far as an average composition corresponding to (Nb, Ta)O x where x = 0.5 to 1.5 and before the second stage the reduction product from the first stage is freed from alkaline earth oxides and/or rare earth metal oxides which are formed and from excess alkaline earth metal and/or rare earth metal by washing with mineral acids.
Le procédé comprend la réduction des oxydes de niobium et/ou de tantale par des métaux alcalino-terreux et/ou des métaux de terres rares, où la première étape de réduction est effectuée basé sur une composition moyenne correspondant à (Nb, Ta) O x où x = 0,5 à 1,5 et avant la deuxième étape, le produit de réduction de la première étape est libéré d'oxydes alcalino-terreux et/ou de terres rares qui sont formés et qui proviennent des excès de métaux alcalino-terreux et/ou de métaux de terres rares par un lavage avec des acides minéraux.
Behrens Frank
Loffelholz Josua
Fetherstonhaugh & Co.
H.c. Starck Gmbh & Co. Kg
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