Abstract
High-purity Mn3O4 was prepared from low-grade rhodochrosite ore (LGRO). The Mn recovery efficiency was more than 97% with the blended precipitant of Na2CO3 and NH4HCO3 (1∶1 mol mol−1). The total Mn content (TMC) of product increased with increase of decomposition time and temperature. The quantitative relationship between TMC and decomposition time as well as decompositions temperature could be fitted by empirical formulae. When decomposing MnCO3 at 1323 K for 120 min, the TMC of Mn3O4 could reach 72·01%, which was larger than that of the premium grade of mangano-manganic oxide for preparing soft magnetic ferrites. The product was investigated by XRD, FTIR and SEM. SEM images revealed that the product consisted of small and uniform particles with smooth surface and good dispersion. Through XRD, FTIR and determination of TMC, the as-prepared product was confirmed to be high-purity γ-Mn3O4. The ionic distributions were formulated as [Mn2+][Mn2+0·3024Mn3+0·2937 Mn4+0·3786 □0·0254]2O4.
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