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Mn3O4was prepared with the chemical bath deposition(CBD) method. A Mn SO4 solution was obtained by the leaching and purifying of low-grade rhodochrosite ore(LGRO), which was used as raw material. The prepa ration procedures were studied and promoted. The result showed that the Mn3O4 with the highest purity and highes specific surface area could be obtained under the following processes. An Mn SO4 solution of 1.0 mol/L was added into a beaker under a flow rate of 30 m L/h. The p H of the reaction solution was adjusted to 10 using NH3 H2 O a80 °C. Then the solids were washed and dried at 200 °C fo2.5 h. The total Mn content(TMC) of Mn3O4 was 72.0 %The ionic distributions was formulated as [Mn2?[Mn2??0.3024Mn30.2937Mn4?h0.37860.0254]2O4. The average crys tallite size of Mn3O4 with a tetragonal hausmannite struc ture was found to be about 35 nm by X-ray diffraction(XRD) analysis. The BET specific surface area of the Mn3O4 measured was 32 m2/g.
Mn 3 O 4 was prepared with the chemical bath deposition (CBD) method. A Mn SO 4 solution was obtained by the leaching and purifying of low-grade rhodochrosite ore (LGRO), which was used as raw material. The prepa ration procedures were studied and promoted. Results showed that the Mn3O4 with the highest purity and highes specific surface area could be obtained under the following processes. An Mn SO4 solution of 1.0 mol / L was added into a beaker under a flow rate of 30 m L / h. The p H of the reaction solution was adjusted to 10 using NH3 H2 O at 80 ° C. Then the solids were washed and dried at 200 ° C fo 2.5 h. The total Mn content (TMC) of Mn3O4 was 72.0% The ionic distributions was formulated as The average crys tallite size of Mn3O4 with a tetragonal hausmannite strucure was found to be about 35 nm by X-ray diffraction (XRD) analysis. The BET of [Mn2- [Mn2- 0.3024Mn30.2937Mn4- h0.37860.0254] 2O4 specific surface area of the Mn3O4 measured was 32 m2 / g.