Separation and recovery of valuable metals from used lithium secondary batteries

摘要

PURPOSE:To provide the method for inexpensively classifying and recovering valuable metals from used secondary batteries. CONSTITUTION:The used secondary batteries are crushed and the crushed matter obtd. in such a manner is separated to magnetic materials and nonmagnetic materials by primary magnetic sepn. The nonmagnetic materials are roasted at 500 to 1000 deg.C in a nonoxidizing atmosphere or in a reducing atmosphere, by which the nonmagnetic materials are reduced. The roasted matter obtd. in such a manner is separated to magnetic materials and nonmagnetic materials by secondary magnetic sepn. As a result, the valuable metals, such as nickel and cobalt, are easily classified and recovered from the used secondary batteries. The classified and recovered magnetic materials are extremely good nickel and cobalt raw materials.