Production of Tungsten by Pulse Current Reduction of CaWO4

Özdemir, Furkan
Erdoğan, Metehan
Elmadağlı, Mustafa
Karakaya, İshak
Tungsten is mainly produced by H-2 reduction of WO3 which makes its production difficult and costly. A promising method was recently reported for direct electrochemical production of tungsten from CaWO4 (scheelite) which is estimated as the seventy percent of the all tungsten reserves of the world. This paper investigates the application of pulse current in the electrochemical reduction of CaWO4 pellets attached to a current collector. The electrolyte was composed of calcium chloride and sodium chloride salts at eutectic composition (48 pct mol NaCl at 873 K). The reduced samples were cleaned with dilute hydrochloric acid solutions and characterized by X-ray diffraction and scanning electron microscopy. Examination of the results revealed that metallic tungsten was obtained by pulse current reduction.


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Erdoğan, Metehan; Karakaya, İshak; Department of Metallurgical and Materials Engineering (2013)
Extensive research in recent years has failed to develop any essentially new method of large scale tungsten production. A new tungsten powder production technique from calcium tungstate (CaWO4) has recently been reported. In this thesis, this technique was further explored from the aspects of electrochemical reduction mechanism and kinetics, applicability to scheelite concentrates and industrial production. Cyclic voltammetry, constant potential and constant current electrochemical reduction tests were perf...
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Özdemir, Furkan; Erdoğan, Metehan; Elmadağlı, Mustafa; Karakaya, İshak (null; 2016-11-01)
Hydrogen reduction of WO3 is the major industrial process in tungsten production. A promising cost and energy efficient method was recently reported [1-3] for direct electrochemical production of tungsten from CaWO4 (scheelite) which is estimated as the two third of the all tungsten reserves of the world. Following the above mentioned patent, several studies verified the production of metallic tungsten by electrochemical reduction of calcium tungstate in the laboratory. This study investigates the applicati...
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Citation Formats
F. Özdemir, M. Erdoğan, M. Elmadağlı, and İ. Karakaya, “Production of Tungsten by Pulse Current Reduction of CaWO4,” 2016, p. 151, Accessed: 00, 2021. [Online]. Available: