发明名称 |
METHOD OF PURIFYING TANTALUM |
摘要 |
<p>Crude tantalum is dissolved in an aqueous hydrofluoric acid containing solution to form tantalum-fluorine complex anions which are then extracted into an organic solvent solution of a water-insoluble quaternary ammonium compound having great affinity for the tantalum anions. The organic solution is next washed witn an aqueous solution containing an inorganic acid and/or an ammonium salt to remove impurities extracted with the tantalum. Tantalum hydroxide precipitated by subsequent treatment with aqueous ammonia is recovered and calcined to yield tantalum pentoxide having a purity of five or six nines.</p> |
申请公布号 |
EP0185550(A3) |
申请公布日期 |
1989.03.22 |
申请号 |
EP19850309238 |
申请日期 |
1985.12.18 |
申请人 |
SUMITOMO CHEMICAL COMPANY, LIMITED |
发明人 |
NIWA, KENJI;ICHIKAWA, ICHIRO |
分类号 |
C01G35/00;C22B3/28;C22B34/24;(IPC1-7):C22B34/24;C22B34/00 |
主分类号 |
C01G35/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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