Abstract
Anodic oxidation of acidic pyrite slurries stirred on platinum electrodes was studied at applied potentials of 0.5–1.0 V, SCE (standard calomel electrode). Hydrogen evolution with Faraday current efficiencies of over 95% was observed at the cathode at potentials as low as 0.6 V, SCE. Pyrite was found to dissolve in the electrolyte forming sulfate anions. X-ray diffraction spectroscopy of samples after 6 h of electrolysis indicated no free sulfur formation on the surface of the pyrites used. The electrochemical evolution of oxygen is replaced by the anodic oxidation of pyrite. Since the oxidation of pyrite occurs at potentials lower than that required for evolution of oxygen in an ordinary water electrolysis cell, the overall potential required for water electrolysis is diminished. The result is lowered consumption of energy and the production of hydrogen, sulfuric acid and ferric sulfate. The effect of temperature, pyrite slurry concentration and electrode potential on the rates of reaction has been investigated and reported.
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