| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method that improves a recovery rate of valuable metals by reducing viscosity of slag when performing dry processing of a discarded battery, such as a lithium-ion battery. <P>SOLUTION: The method for recovering valuable metals includes a dry step S20 including: a melting step ST21 of obtaining a molten material by melting a discarded battery containing 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 valuable metals from the molten material, wherein the slag has an aluminum oxide content of 5 mass% or higher but less than 20 mass% and an iron content in terms of metallic iron of 20-40 mass%. Furthermore, silicon oxide and calcium oxide are added as a flux in the melting step ST21 so that the slag has a melting point of 1,400°C or lower, and the melting step ST21 is conducted at 1,400°C or lower. Thus, since the slag has a reduced viscosity and hence is easy to separate from the alloy, the recovery rate of the alloy can be improved and also the operation at a low temperature of 1,400°C or lower becomes possible. <P>COPYRIGHT: (C)2013,JPO&INPIT |
