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We have conducted studies to produce chemical manganese dioxides (CMDs) from ternary cathodic materials by oxidative precipitation. In this study, a cathodic material was concentrated by pretreatment and leached with sulfuric acid to recover 1L of a leachate containing 22.0g/dm 3 of Co, 21.6g/dm 3 of Mn, 24.2g/dm 3 of Ni, 9.5g/dm 3 of Li and 8mg/dm 3 of Al as valuable metals. For selective oxidative precipitation of Mn (II), the leachate was reacted with 1 equivalent of Na2S2O8 based on the Mn concentration with stirring at 500rpm at a temperature of 363K for 18000s. As a result of the reaction, it was confirmed that the majority of Mn was precipitated from the solution. XRD, PSA, TG­DTA, LECO and ICP analyses were performed to characterize the precipitate. The analytical results revealed the production of a chemical manganese dioxide (CMD) having a chemical composition of 84.60% MnO, 1.40% Co3O4, 0.11% Li2O, 0.25% NiO, 0.02% Al2O3, 0.06% S and 0.52% Na2O, an average particle diameter of 10.7µm, a crystal form of £-MnO2, and a purity of at least 98%. [doi:10.2320/matertrans.M2012379]

Production of Chemical Manganese Dioxide from Lithium Ion Battery Ternary Cathodic Material by Selective Oxidative Precipitation of Manganese