To provide a method for increasing a recovery rate of a valuable metal by decreasing viscosity of slag when performing dry treatment of a waste battery such as a lithium ion battery.
A method for recovering a valuable metal includes, in a dry process S20: a melting step ST21 of obtaining a molten material by melting a waste battery including aluminum and iron; a slag separation step ST22 of separating slag from the molten material; and an alloy separation step ST23 of separating an alloy of the valuable metal from the molten material. In the melting process ST21, silicon oxide and calcium oxide are added as flux, and the melting step ST21 is performed at 1,500°C or more, and preferably at 1,650°C or less so that the slag has an content of aluminum oxide of not less than 20 mass% and less than 75 mass%, a content of iron calculated as metallic iron of 5-40 mass%, and further the slag has a melting point of 1,500°C or more, and preferably 1,650°C or less. Thus, the viscosity of the slag is decreased, and separation from the alloy becomes easier, thereby increasing the recovery rate of the alloy.
MORI KAZUHIRO
| JP2002339023A | 2002-11-27 | |||
| JP2000226619A | 2000-08-15 | |||
| JPH09291317A | 1997-11-11 | |||
| JPH10152730A | 1998-06-09 | |||
| JP2000067935A | 2000-03-03 | |||
| JP2002327215A | 2002-11-15 | |||
| JPH10158751A | 1998-06-16 | |||
| JP2002339023A | 2002-11-27 | |||
| JP2000226619A | 2000-08-15 | |||
| JPH09291317A | 1997-11-11 |
| EP1589121A1 | 2005-10-26 |
Hayashi Ichiyoshi