Silicon recovery from silicon-iron alloys by electrorefining in molten fluorides

Abstract : Electrorefining of a silicon-iron material (Si-4.7at%Fe) in molten NaF-KF at 850°C has been investigated in view of recovering pure Si, using electrochemical techniques, SEM-EDS and ICP-AES analyses. The selective electrochemical dissolution of Si was evidenced. Electrorefining runs led to a maximum Si recovery of 80% of the initial Si contained in the material, in the form of a dense deposit at the cathode, with very high current efficiencies. The Si purity has been examined and no Fe was detected by ICP-AES analysis: the recovered Si purity is thus assumed to be higher than 99.99%.
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Laurent Massot, Anne-Laure Bieber, Mathieu Gibilaro, Laurent Cassayre, Pierre Taxil, et al.. Silicon recovery from silicon-iron alloys by electrorefining in molten fluorides. Electrochimica Acta, Elsevier, 2013, vol. 96, pp. 97-102. ⟨10.1016/j.electacta.2013.02.065⟩. ⟨hal-00805734⟩

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