Optimum Conditions of Dismantlement for Recovery of Valuables from Spent Lithium Primary Batteries

摘要

The optimum discharging condition to dismantle the batteries without explosion was investigated to recycle the lithium primary batteries, which could be exploded by heating too much or crushing. The 3 waste lithium primary battery cells were discharged with 500 cm~3 of 0.5 kmol-m~(-3) sulfuric acid. Fe concentration and pH increased rapidly after 3 days at 35 D and after 1 day at 50D. Chromium concentration increased by 4 days at 35D and 2 day at 50□ and then decreased, and nickel concentration was very low. Because Li concentration increased gradually, Li became dissolved after the dissolution of cover material. When the discharged batteries were shredded, the batteries discharged at 50°C were not exploded and those discharged during 3 days at 35°C were exploded. This result shows that the waste batteries could be stabilized within 1 day at 50°C and 4 days at 35°C.