China Nonferrous Metallurgy

In this paper, a comprehensive recovery test of valuable components in used lithium manganate battery is carried out. Acid leaching for the mixed powder of lithium manganate and graphite: when the concentration of sulfuric acid is 0.5mol/L and that of hydrogen peroxide is 6%, LiMn₂O₄ is almost completely decomposed and leached out, so as to obtain high-purity graphite. The LiMn₂O₄ leachate is subject to electrolysis to obtain 98.41% MnO₂, but the product has low crystallinity and contains much amorphous component. Alkaline leaching for the mixture of aluminum foil and copper foil: aluminum foil and copper foil are separated. Al(OH)₃ with a purity of 95.14% is prepared by NaAlO₂-containing filtrate. The waste copper foil is pressed into anode sheet and is subject to electrorefining under the conditions of Cu²⁺ of 45g/L, H₂SO₄ of 185g/L, reaction temperature of 50℃, electrolysis lasting 2h, electrode spacing of 3cm and current density of 400A/m², the current efficiency is 96.2% and the purity of electrolytic refined copper reaches 98.96%.