Author(s)

Chungu Mwana Mwamba Yannick¹, Michael Kabangu Ngoie¹, Muliangala Mbalaba Francis¹, Kasambay Mutangala Francis¹, Mulaja Tshakatumba Constantin¹, Ilunga Mutombo Gabriel¹, Ilunga Mwanza Israel²

¹Department of Metallurgy and Materials, Faculty of Polytechnics/University of Lubumbashi, Lubumbashi, Democratic Republic of the Congo.
²Laboratory of Metallography, Faculty of Polytechnics, University of Lubumbashi, Lubumbashi, Democratic Republic of the Congo.

Precipitation was carried out to obtain manganese carbonate by adding a precipitating agent, sodium carbonate (NaCO₃). This was followed by calcination of the manganese carbonate (MnCO₃) to obtain manganese dioxide (MnO₂). For precipitation tests, a pH ranging from 8 to 10, a time of one to two hours, and a temperature of 25°C and 50°C are the parameters that are considered. The calcination of MnCO₃ is carried out under the following conditions: time (1, 2, 3, and 4 hours) and temperature (370°C, 420°C, and 470°C). It should be noted that the temperature range selected for the calcination tests is based on thermodynamic data obtained using the HSC CHEMISTRY software. The results obtained show an effective recovery of manganese at 25°C, in one hour, with a pH of 8.5 with a precipitation yield and manganese content in the precipitate around 98.43% and 24.21%, respectively. During calcination tests, results show an increase in mass loss, for a constant calcination time, as temperature increases. On the other hand, increasing the calcination time at a given temperature causes an increase in mass loss. However, a significant decrease in mass loss is noted at 3 hours of calcination. The highest mass loss is obtained at a temperature of 470°C after 4 hours of calcination.

Manganese, Calcination Temperature, Carbonate, Manganese Dioxide, Precipitation

Yannick, C. , Ngoie, M. , Francis, M. , Francis, K. , Constantin, M. , Gabriel, I. and Israel, I. (2022) Manganese Dioxide (MnO₂) Gaining by Calcination of Manganese Carbonate (MnCO₃) Precipitated from Cobalt Removal Solutions. Open Journal of Applied Sciences, 12, 598-613. doi: 10.4236/ojapps.2022.124041.