Abstract
The process kinetics on a graphite anode in oxyhalide melts based on the CsCl–KCl–NaCl eutectic with TeO2 and NaF additives is investigated at 600°C. Dependences of limiting recharge currents of tellurium atoms and residual discharge currents of oxygen-containing ions on the TeO2 and NaF contents are investigated. Exceeding these currents leads to chlorine liberation in oxychloride melts and liberation of freons in chloride–fluoride melts. The dissolution mechanism of TeO2 in chloride and chloride–fluoride melts through the formation and subsequent dissociation of tellurium oxychloride with the formation of O2–, TeCl62-, and [TeO2Cl]– ions is proposed. The presence of these ions in the electrolyte is confirmed by infrared spectroscopy and explains high discharge rates of oxygen-containing ions at the anode.
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