Valuable metal leaching method, and valuable metal collection method employing the leaching method

摘要

The present invention provides a valuable metal leaching method and a valuable metal collection method, in each of which the leaching of a valuable metal can be achieved with high efficiency, the amount of a reducing agent to be used can be reduced, and the cost can be reduced. The present invention is characterized in that a positive electrode material is immersed in an acidic solution together with a metal having a poorer reduction potential than that of hydrogen and a valuable metal is allowed to leach from a positive electrode active material.