PROCESS FOR PRODUCTION OF NIOBIUM POWDER

文件类型：PDF文档
文件大小：104K
PROBLEM TO BE SOLVED : To provide a process for the production of high purity niobium powders used for a capacitor. SOLUTION : A process for producing niobium powders by the reduction of their corresponding niobium oxides, wherein the reduction is carried out in two stages using a reducing agent selected from the group consisting of alkaline earth metals and rare earth metals, the process comprising : conducting the first reduction stage using the reducing agent as far as an average composition corresponding to (Nb)Ox wherein x=0.5 to 1.5 is reached, washing the reduction product from the first reduction stage with one or more mineral acids to remove oxides of the reducing agent, and then conducting the second reducing stage with the reducing agent to produce powder of niobium. COPYRIGHT : (C)2007, JPO&INPIT