Abstract
AbstractThe dissolution characteristics and electrochemical reduction mechanism of oxides of refractory metals ZrO2, HfO2and MoO3in NaCl-KCl-NaF melts are studied. The results shows that there are no chemical reaction of ZrO2and HfO2in NaCl-KCl-NaF melts, the dissolution of MoO3is chemically dissolved, and MoO3reactwith melts to form Na2Mo2O7. The reduction process of zirconium in the NaCl-KCl-NaF-ZrO2melts is a reversible process of one-step electron transfer controlled by diffusion. The electrochemical reduction process of ruthenium is a one-step reversible process and the product is insoluble; Electrochemical reduction of metallic molybdenum in melts is controlled by the diffusion and electron transfer process of active ion Mo2O27−. The electrochemical reduction process of the metal molybdenum in the melts is carried out in two steps.
Highlights
Oxides of refractory metals have good high temperature strength, good corrosion resistance to molten alkali metals and vapors, and have wide applications in some special fields
The results shows that there are no chemical reaction of ZrO2 and HfO2 in NaCl-KCl-NaF melts, the dissolution of MoO3 is chemically dissolved, and MoO3 reactwith melts to form Na2Mo2O7
The traditional melts electrolysis method is to dissolve the mixture in melts for electrolysis, and the basic idea is derived from electrolytic aluminum [4]
Summary
Oxides of refractory metals have good high temperature strength, good corrosion resistance to molten alkali metals and vapors, and have wide applications in some special fields. Melts electrolysis is mainly used to produce metal elements whose electrode potential is much more negative than hydrogen. These metals cannot be produced by aqueous solution electrolysis, including light metals, refractory metals, rare earth metals and certain non-metals. Fray, Farthing, and Chen proposed the FFC method for the direct electrowinning of titanium by titanium oxide [6]. The electrochemical behavior of ZrO2, HfO2 and MoO3 in the melts was analyzed by using NaCl-KClNaF melts as the base salt
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