Formation mechanism of manganese compounds in acidic electrolytes of copper
DOI:
https://doi.org/10.3989/revmetalm.2007.v43.i1.46Keywords:
PbCaSn anodes, Corrosion, Lead slime, Manganese slime, ElectrowinningAbstract
The formation mechanism of manganese compounds in acidic electrolytes (180 g/l of H2SO4) was studied by potentiostatic experiments at 50 ºC. In the oxide layer on a PbCaSn anode, amorphous MnOOH was formed. XRD showed that anodic slimes collected from the cell bottom after 3 h was made up of: g-MnO2 and e-MnO2. It was proved that the e type oxide was formed by an electrochemical process and the g type oxide was formed by a pure chemical precipitation, the last one depends on the MnO4- concentration in the electrolyte. The electrochemical formation of MnOOH only depends on the concentration of Mn3+ in the electrolyte, and this amorphous compound is the intermediate specie for generating e-MnO2. Fe2+, in the presence of Mn2+, inhibited the formation of both MnO2 oxides, and in the anode interfase reduces PbO2 to PbSO4, that repots in the anodic slime. Furthermore, the presence of ferrous ion resulted in a better distribution of the manganese compounds and originates PbSO4 precipitates, which report on the slime
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