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(1) Reducibility decreases in the next order: i.e. MnO2 ore, burnt ore of MnCO3 (manganese low oxide ores such as ƒ¿-Mn2O3 or Mn3O4 etc.) and manganese silicate ore. It is plain enough that every ore is reduced to MnO with CO gas. (2) There is scarcely any difference in reducibility with CO gas among all MnO2 phases i.e. cryptomelane, pyrolusite, γ-MnO2 and birnessite. Only, MnO2 transforms to reduced state (till Mn3O4) through mere thermal decomposition simultaneously with reduction by CO gas. Therefore, authors support the general reasoning that easily thermal-decomposable and

Studies on Properties and Reduction of Manganese Ores