| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a treatment method by which a tungsten component can be efficiently recovered from tungsten-containing sludge. <P>SOLUTION: The recovery treatment method for tungsten comprises: a step where a raw material mixture comprising a tungsten component and a silica component is oxidized and roasted; a step where the oxidized and roasted matter is admixed with an alkali solution so as to leach the tungsten component and the silica component; a step where the separated leachate is admixed with calcium hydroxide so as to precipitate the silica component in the liquid; a step where the same is subjected to solid-liquid separation so as to obtain a leachate of the tungsten component; and a step where the tungsten is recovered from the leachate, e.g., a cemented carbide-containing waste water sludge is used as the raw material mixture so as to recover the tungsten. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
