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Electrolytic reduction of CrF
Nan Ji1, Fangling Jiang2, Hao Peng1
1Shanghai Institute of Applied Physics, Chinese Academy of Sciences Shanghai 201800 PR China penghao@sinap.ac.cn +86 021 39194053 +86 021 39194053.
Abstract:
The electrochemical behavior of Cr3+ in molten LiF-NaF-KF (46.5 : 11.5 : 42 mol%) (FLiNaK) was studied by cyclic voltammetry (CV) at 600 °C. With an acceptable solubility and a relatively positive reduction potential of solute Cr3+, the electrolytic reduction of chromium in FLiNaK-CrF3 melt was performed on a tungsten electrode by potentiostatic electrolysis. After electrolysis for 21.5 h, the Cr3+ in the melt was effectively removed as confirmed by ICP-OES and CV. Then, the solubility of Cr2O3 in FLiNaK with ZrF4 additive was analyzed by CV. The results showed that the solubility of Cr2O3 was greatly promoted by ZrF4 and the reduction potential of zirconium is far more negative than that of chromium, which makes the electrolysis of chromium from Cr2O3 material possible. Thus, the electrolytic reduction of Cr in a FLiNaK-Cr2O3-ZrF4 system was further performed by potentiostatic electrolysis on a nickel electrode. After electrolysis for 5 h, a thin layer of chromium metal (with a thickness of c.a. 20 μm) was deposited on the electrode, as confirmed by SEM-EDS and XRD techniques. This study verified the feasibility of electroextraction of Cr from the FLiNaK-CrF3 and FLiNaK-Cr2O3-ZrF4 molten salt systems.
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