| 发明名称 |
Reclamation of tungsten values from tungsten-thoria scrap by sodium hydroxide fusion |
| 摘要 |
<p>Tungsten-thoria (I) and sodium hydroxide are charged to a crucible and heated to melt the NaOH for reaction with (I) to provide water soluble sodium tungstate (II) and a water insoluble thoria residue (III). The crucible is then cooled and (II) and (III) separated.</p> |
| 申请公布号 |
EP0881307(B1) |
申请公布日期 |
2001.02.21 |
| 申请号 |
EP19980109899 |
申请日期 |
1998.05.29 |
| 申请人 |
OSRAM SYLVANIA INC. |
发明人 |
VANDERPOOL, CLARENCE D.;WOLFE, THOMAS A.;MILLER, MICHAEL J. |
| 分类号 |
C01G41/00;C22B34/36;C22B60/02;(IPC1-7):C22B34/36 |
主分类号 |
C01G41/00 |
| 代理机构 |
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