| 摘要 |
<p>PCT No. PCT/EP96/02399 Sec. 371 Date May 4, 1998 Sec. 102(e) Date May 4, 1998 PCT Filed Jun. 3, 1996 PCT Pub. No. WO96/41768 PCT Pub. Date Dec. 27, 1996A method for the preparation of sodium tungstate by the oxidation of hard metal scrap and/or heavy metal scrap in a molten salt mixture of hydroxide and sodium sulfate.</p> |
