共存硫酸塩を含む強酸性MnSO_4溶液中のオゾン酸化によって生成した沈殿のX線回折および放電特性

概要

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The incorporation of coexisting metal ion in the precipitates produced by ozone oxidation-precipitation in acidified MnSO4 solutions with an added sulfate was investigated for 15 elements (18 ionic species) by chemical analysis, X-ray diffraction and discharge curve measurement of the precipitates.The precipitates were formed in the stream of O3 - O2 gas mixture with ozone partial pressure of 2.7 × 10 - 3 atm at 70°C in the solutions of 1.0 M sulfuric acid, 0.1 M MnSO4 and other metal sulfate. A little incorporation in the γ -MnO2 based precipitate was detected for alkali metal ions, Mg, Cu, Co and Ni ions. Both Fe (II) and Fe (III) ions were captured in the precipitate and affected significantly the discharge curve of the precipitate. The precipitates formed in the presence of Ti, V or As showed a fairly high content of the coexisting element, X-ray diffraction peaks remarkably differing from those for γ -MnO2 and poor discharge behavior. These suggest possibility for Ti, V or As to be precipitated as some compounds with Mn rather than to be incorporated into the MnO2-based precipitate.
社団法人資源・素材学会の論文
2000-04-25