METHOD FOR RECOVERING VALUABLE METALS FROM WASTE LITHIUM-ION SECONDARY BATTERIES

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Waste lithium-ion secondary batteries are heated with a superheated vapor having a temperature of 350-550ºC to pyrolyzed the organic substances contained in the batteries. Subsequently, the residue is subjected successively to primary crushing with a crusher, primary classification at a classification point of 0.15-0.60 mm, and secondary crushing, in which the current collectors remaining on the sieve are crushed with a vibration mill. Secondary classification is then conducted in which the product of the secondary crushing is classified at the same classification point, and the residue of the positive-electrode materials which contains rare metals is recovered from under the sieve. Thus, the organic substances in the batteries can be inexpensively pyrolyzed while inhibiting oxidation of the metals and generation of dioxins. Furthermore, since the positive-electrode current collectors constituted of aluminum do not melt, the valuable metals in the positive-electrode materials are recovered to a higher degree.