| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for economically recovering noble metal-containing waste or the like with high efficiency. <P>SOLUTION: In the method where a noble metal-containing material is heated and melted together with a tin compound, a reducing agent and flux, the noble metal is eluted by the reduction melting, further, the noble metal is absorbed into the produced metal tin melted layer, and the molten metal layer comprising the noble metal is separated from an oxide layer, so as to be recovered, the reduction melting is performed in the two stages of strong reduction and weak reduction, slag comprising reduced tin oxide and noble metal is formed by the strong reduction, and next, iron comprised in the melted metal layer is removed into the slag by the weak reduction, thus the melted metal layer having an increased noble metal grade is recovered. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
