发明名称 |
Niobium powder and a process for the production of niobium and/or tantalum powders |
摘要 |
The process comprises the reduction of niobium and/or tantalum oxides by means of alkaline earth metals and/or rare earth metals, wherein the first reduction stage is carried out as far as an average composition corresponding to (Nb, Ta)Ox where x=0.5 to 1.5 and before the second stage the reduction product from the first stage is freed from alkaline earth oxides and/or rare earth metal oxides which are formed (and optionally from excess alkaline earth metal and/or rare earth metal) by washing with mineral acids.
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申请公布号 |
US6136062(A) |
申请公布日期 |
2000.10.24 |
申请号 |
US19990400399 |
申请日期 |
1999.09.21 |
申请人 |
H. C. STARCK GMBH & CO. KG |
发明人 |
LOEFFELHOLZ, JOSUA;BEHRENS, FRANK |
分类号 |
B22F1/00;B22F9/20;C01G33/00;C01G35/00;C22B5/18;C22B34/24;C22C1/04;C22C27/02;H01G9/052;(IPC1-7):B22F1/00 |
主分类号 |
B22F1/00 |
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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