TITLE:
Manganese Dioxide (MnO2) Gaining by Calcination of Manganese Carbonate (MnCO3) Precipitated from Cobalt Removal Solutions
AUTHORS:
Chungu Mwana Mwamba Yannick, Michael Kabangu Ngoie, Muliangala Mbalaba Francis, Kasambay Mutangala Francis, Mulaja Tshakatumba Constantin, Ilunga Mutombo Gabriel, Ilunga Mwanza Israel
KEYWORDS:
Manganese, Calcination Temperature, Carbonate, Manganese Dioxide, Precipitation
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.12 No.4,
April
29,
2022
ABSTRACT: 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.