Abstract
The contents of manganese, water and sulfate ion, O/Mn mole ratio and BET specific surface area have been determined for the manganese dioxide produced by ozone oxidation in acidified sulfate solutions. The manganese dioxide was formed under the following ozonation conditions: the sulfuric acid concentration of the solution, 0.25 to 5.0mol/l and the temperature, 25.0 to 80.0°C, and the ozone partial pressure, 2.8×10-2 atm.The water content of the manganese dioxide was considerably reduced with a rise in the ozonation temperature and increased with an increase in the acid concentration.The O/Mn mole ratio or x in MnOX was almost constant at a high value around 1.98 over an acid concentration range up to 5.0mol/l and increased very marginally with a rising ozonation temperature.Similar features were determined in the chemical analyses for the manganese dioxide formed in solutions of similar composition to the electrolyte solution for zinc electrowinning.
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