公开(公告)号：US20040213716A1

公开(公告)日：2004-10-28

申请号：US10709219

申请日：2004-04-22

Applicant: OSRAM SYLVANIA INC.

Inventor： Raj P. Singh Gaur ,  Robert G. Mendenhall

IPC: C22B034/24

CPC classification number: C22B3/10 ,  C22B3/0005 ,  C22B3/08 ,  C22B34/24 ,  Y02P10/234

Abstract: A method for the dissolution and purification of tantalum ore and synthetic concentrates is described. The method preferably uses ammonium bifluoride as the fluoride source in place of the hydrofluoric acid used in the conventional methods. Other fluoride compounds such as NaF, KF, and CaF2 may be used alone or in combination with ammonium bifluoride. The tantalum concentrate and fluoride source are combined with sulfuric acid to form a solution containing tantalum values and impurities. The tantalum values are then separated from the impurities by solvent extraction.

Abstract translation: 描述了一种用于溶解和纯化钽矿石和合成浓缩物的方法。 该方法优选使用氟化铵作为氟化物源代替常规方法中使用的氢氟酸。 其它氟化物如NaF，KF和CaF 2可以单独使用或与二氟化铵组合使用。 将钽精矿和氟化物源与硫酸结合形成含钽和杂质的溶液。 然后通过溶剂萃取将钽值与杂质分离。

公开(公告)号：US20020111267A1

公开(公告)日：2002-08-15

申请号：US09965444

申请日：2001-09-27

Applicant: OSRAM SYLVANIA Inc.

Inventor： Joel B. Christian ,  Robert G. Mendenhall

IPC: B01J021/18 ,  B01J023/30

CPC classification number: H01M4/92 ,  B01J21/18 ,  B01J23/30 ,  B01J37/348 ,  H01M4/8807 ,  H01M4/885 ,  H01M4/90 ,  H01M4/9016 ,  H01M4/9083 ,  H01M8/1007 ,  H01M2008/1095 ,  Y02P70/56 ,  Y10S502/514

Abstract: A tungsten-containing fuel cell catalyst having high electrochemical activity and its method of making are described. The tungsten-containing catalyst may be formed in situ in a fuel cell after the fuel cell is assembled. The catalyst is formed by a low temperature electrochemical activation of a tungsten-containing precursor which has been deposited on a carbon support

Abstract translation: 描述了具有高电化学活性的含钨燃料电池催化剂及其制备方法。 在组装燃料电池之后，可以在燃料电池中原位形成含钨催化剂。 该催化剂通过已经沉积在碳载体上的含钨前体的低温电化学活化而形成