Electrolytic manganese metal present is generally used Pb-Sb-Sn-Ag four yuan together as anode, the anode and the simultaneous analysis of MnO 2 O 2 Analysis of two competing reactions:
MnO 2 +4H + +2e - ===Mn 2+ +2H 2 O (1)
When [Mn 2+ ]=1mol/L, φ Ө 25 (MnO 2 )=1.229V φ 25 =1.229-0.1192pH
φ 100 =1.1824-0.148pH
O 2 +4H + +4e - ===2H 2 O (2)
When P o2 =101 kPa, φ Ө 25 (o 2 )=1.229V
φ 25 =1.229-0.0591pH
φ 100 =1.167-0.074 pH
MnSO 4 -H 2 SO 4 system φ-temperature diagram, see the figure below.
As can be seen from the figure, both temperature rises φ 2 and φ 1 decrease, and the φ 2 - φ 1 potential difference increases, indicating that high temperature favors the preferential precipitation of MnO 2 .
For the electrolytic manganese anode process, it is required to produce MnO 2 (also known as anode mud) as little as possible to reduce the consumption of Mn 2+ and the turbidity of the selected electrolyte, so the application of low temperature, low [SO 4 2- ]T and high Technical conditions such as anode current density are advantageous for metal precipitation.
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