C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 34/24 (2006.01) C01G 35/00 (2006.01) C22B 1/00 (2006.01) C22B 3/06 (2006.01) C22B 3/10 (2006.01)
Patent
CA 2478033
Methods to control hydrogen sulfide and/or arsine emissions are described. The method involves adding at least one copper compound (such as a copper (II) compound) to the material, such as material containing sulfur in a sufficient amount to control said emissions. The material that is treated with the copper compound(s) is preferably an ore, such as a valve metal containing ore, such as tantalum-bearing ore. More in particular, the method involves adding copper oxide during the digestion of Ta ore material with hydrofludic acid.
L'invention concerne des procédés destinés à contrôler les émission de sulfure d'hydrogène et/ou d'arsine. Ce procédé consiste à ajouter au moins un composé de cuivre (tel qu'un composé de cuivre (II)) à une matière, telle qu'une matière contenant du soufre, en quantité suffisante pour contrôler lesdites émissions. La matière traitée avec ce ou ces composé(s) de cuivre est de préférence un minerai, tel qu'un minerai contenant du tantale. Plus particulièrement, ce procédé consiste à ajouter de l'oxyde de cuivre pendant la digestion d'une matière de minerai contenant du Ta avec de l'acide hydrofluorique.
Cabot Corporation
Hard Robert A.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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