Constant and pulse voltage applications in CaWO4 reduction

Goksu O. G., KARAKAYA İ., Erdogan M.

EPD Congress 2010 - TMS 2010 Annual Meeting and Exhibition, Seattle, WA, Amerika Birleşik Devletleri, 14 - 18 Şubat 2010, ss.387-394 identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Basıldığı Şehir: Seattle, WA
  • Basıldığı Ülke: Amerika Birleşik Devletleri
  • Sayfa Sayıları: ss.387-394
  • Anahtar Kelimeler: CaWO4, Electrochemical reduction, Molten salt, Pulse voltage, Tungsten
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

It has been shown that metallic tungsten powder can be obtained by electrochemical reduction of solid CaWO4 in molten CaCl 2-NaCl eutectic mixture at 600°C In this study, constant and pulse voltage electrolysis experiments were performed to optimize reduction kinetics and obtain information about the mechanism of above process. It was found that pulse voltage applications yield faster reduction rates when average voltage of pulse voltage application was the same as constant voltage application. In addition, analysis of the current vs. time graphs of constant and pulse voltage electrolysis studies showed that reduction occurs at potential differences higher than about 2.2 V between CaWO4 cathode and graphite rod anode.