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Citation: Yang Song-Qing, Jiang Han-Ying. Electrochemical Studies on Pyrite[J]. Acta Physico-Chimica Sinica, ;1991, 7(06): 735-739. doi: 10.3866/PKU.WHXB19910620 shu

Electrochemical Studies on Pyrite

1.
Centro-South University of Technology, Changsha 410083

Received Date: 19 January 1991
Available Online: 15 December 1991

The anodic and cathodic processes of pyrite in acid solution of sulfate and chloride have been studied.
The stable products of anodic processes are Fe~(3+), SO_4~(2-), as well as Fe~(2+) and S. The first stage of anodic reaction is:
FeS_3= Fe~(2+)+2S+2e~- (1)
followed by the oxidation of Fe~(2+) to Fe~(3+) and the production of SO_4~(2-). The relationship of overpotential (η) and the current density (Ⅰ) can be represented by the equation:
η=0.26+0.115lgI
the exchange current density is 0.005 A·m~(-2), and the standard rate constant is 2.58×10~(-8) ms~(-1).
The mechanism for the reaction (1) might be expressed as:...
- Pyrite; Anodic and cathodic processes; Reaction mechanism
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