| 摘要 |
<p>PROBLEM TO BE SOLVED: To safely and efficiently recover and recycle various kinds of metals from wastes of battery packs of a primary battery and a secondary battery by immersing electrodes in acid liquid, eroding binder, and separating a collector and an active material from each other. SOLUTION: After discharging, a battery and a battery pack are disassembled and washed, an electrolyte in the battery is recovered, and ferrous components for constituting a housing are removed by selection with magnetic force. After that, recovering of various kinds of metallic compounds for constituting a collector of an electrode and the active material is performed by wet processing. The collector and an active material layer are impregnated in sulfuric acid or nitric acid. Therefore, acid enters between the collector and the active material, the collector is a little dissolved, and the active material is separated. The positive electrode active material is dissolved in acid, adjusted in pH, separated into Co and Li, and recovered. The collector is adjusted in pH with sulfuric acid used in the before process, and Al is recovered. Copper is recovered by electrysis. Moreover, the pH adjustment is performed, and Co and Li are recovered.</p> |
