The electrochemical behavior of Cr 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 Cr, the electrolytic reduction of chromium in FLiNaK-CrF melt was performed on a tungsten electrode by potentiostatic electrolysis. After electrolysis for 21.5 h, the Cr in the melt was effectively removed as confirmed by ICP-OES and CV. Then, the solubility of CrO in FLiNaK with ZrF additive was analyzed by CV. The results showed that the solubility of CrO was greatly promoted by ZrF and the reduction potential of zirconium is far more negative than that of chromium, which makes the electrolysis of chromium from CrO material possible. Thus, the electrolytic reduction of Cr in a FLiNaK-CrO-ZrF 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 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-CrF and FLiNaK-CrO-ZrF molten salt systems.
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| http://dx.doi.org/10.1039/d3ra02926c | DOI Listing |
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