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公开(公告)号：EP2446986A4
公开(公告)日：2016-12-28
申请号：EP10791134
申请日：2010-03-31
发明人： SHI WENFENG , CHEN XUEQING , LI YONG , XI XUDONG , GUO TAO
CPC分类号： C01G35/00 , B22F9/20 , B22F2998/10 , B22F2999/00 , C01P2004/03 , C01P2004/62 , C01P2006/10 , C01P2006/12 , C01P2006/40 , H01G9/0029 , H01G9/0525 , B22F2201/013 , B22F2201/20 , B22F2201/10 , B22F1/0096
摘要： The present invention provides a process for preparing a tantalum powder with high specific capacity, which process comprising the steps of, in sequence, (1) a first reduction step: mixing tantalum oxide powder and a first reducing agent powder homogenously, and then carrying out reduction reaction in hydrogen and/or inert gas or vacuum atmosphere to obtain a tantalum suboxides powder; (2) a second reduction step: mixing the tantalum suboxides powder obtained from the step (1), in which impurities have been removed, and a second reducing agent powder homogenously, and then carrying out reduction reaction in hydrogen and/or inert gas or vacuum atmosphere to obtain a tantalum powder having high oxygen content; (3) a third reduction step: mixing the tantalum powder having high oxygen content obtained from the step (2), in which impurities have been removed, with a third reducing agent powder homogenously, and then carrying out reduction reaction in hydrogen and/or inert gas or vacuum atmosphere to obtain a tantalum metal powder suitable for capacitors; wherein after each reduction step, the oxidation product of reducing agent and the residual reducing agent are removed from the reaction product.
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