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。