Electrochemical deoxidation of ZrSiO4 in molten calcium chloride

Lee, Min-Jae; Noh, Jae-Soo; Kim, Ki‐Young; Lee, Jong‐Hyun

doi:10.1134/s0031918x1413016x

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…This is due to the fact that CaO dissolves in CaCl 2 molten salt and enables O 2− ion transport under electrolytic conditions [41]. During electrolysis, Ca 2+ ions can combine with nearby O 2− ions to form CaO, which can then react with metal oxides to produce intermediate phases that are subsequently reduced during the electrolysis process [42][43][44][45][46][47][48][49]. In the electrolytic production of metallic titanium in a CaCl 2 -NaCl mixture, CaO reacts with TiO 2 to form an intermediate phase, CaTiO 3 .…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of CaO on the Electrochemical Reduction of Fe2O3 in NaCl-CaCl2 Molten Salt

Li,

Song,

Liang

et al. 2023

Molecules

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The presence of calcium-containing molten salts in the electrolysis of oxides for metal production can lead to the formation of CaO and, subsequently, the generation of intermediate products, affecting the reduction of metals. To investigate the impact of CaO on the reduction process, experiments were conducted using a Fe2O3-CaO cathode and a graphite anode in a NaCl-CaCl2 molten salt electrolyte at 800 °C. The electrochemical reduction kinetics of the intermediate product Ca2Fe2O5 were studied using cyclic voltammetry and I-t curve analysis. The phase composition and morphology of the electrolysis products were analyzed using XRD, SEM-EDS, and XPS. The experimental results demonstrate that upon addition of CaO to the Fe2O3 cathode, Ca2Fe2O5 is formed instantly in the molten salt upon the application of an electrical current. Research conducted at different voltages, combined with electrochemical analysis, indicates that the reduction steps of Ca2Fe2O5 in the NaCl-CaCl2 molten salt are as follows: Ca2Fe2O5 ⟶ Fe3O4 ⟶ FeO ⟶ Fe. The presence of CaO accelerates the electrochemical reduction rate, promoting the formation of Fe. At 0.6 V and after 600 min of electrolysis, all of the Ca2Fe2O5 is converted into Fe, coexisting with CaCO3. With an increase in the electrolysis voltage, the electrolysis product Fe particles visibly grow larger, exhibiting pronounced agglomeration effects. Under the conditions of a 1 V voltage, a study was conducted to investigate the influence of time on the reduction process of Ca2Fe2O5. Gradually, it resulted in the formation of CaFe3O5, CaFe5O7, FeO, and metallic Fe. With an increased driving force, one gram of Fe2O3-CaO mixed oxide can completely turn into metal Fe by electrolysis for 300 min.

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Section: Introductionmentioning

confidence: 99%

Study on the Influence of CaO on the Electrochemical Reduction of Fe2O3 in NaCl-CaCl2 Molten Salt

Li,

Song,

Liang

et al. 2023

Molecules

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Thermodynamics of Fe Reduction in Melts Electrolysis

Liang

2022

The Minerals, Metals &Amp; Materials Series

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Processing of Zirconium Oxide Raw Materials to Produce Zirconium Silicides via Electrolysis of KCl-K₂SiF₆-ZrO₂ Melt

Gorshkov,

Suzdaltsev,

Gevel

et al. 2024

J. Electrochem. Soc.

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The possibility of electrochemical synthesis of zirconium silicides by electrolysis of KCl-K2SiF6 melt with ZrO2 additives at 790°C has been studied. To determine the synthesis parameters, the kinetics and some features of the mechanism of the cathodic process in the investigated melt on glassy carbon were studied by cyclic chronovoltammetry and chronoamperometry. It was shown that the electroreduction of silicon ions in the KCl-K2SiF6 melt takes place at potentials from 0 to -0.2 V. Additional peaks at more negative potentials were obtained on the voltametric dependences, presumably related to the reduction of zirconium ions and the co-reduction of silicon and zirconium ions. Electrolysis of KCl-K2SiF6 melt with additions of 0.33 and 0.66 wt% ZrO2 in galvanostatic mode at cathodic current density of 20 mA cm-2 was performed in order to check assumptions. Cathode deposits were obtained, which were analyzed by X-ray diffraction and scanning electron microscopy after separation of salt residues. It is shown that the precipitates were represented by zirconium silicides (ZrSi2, ZrSi) as well as oxides (SiO2, ZrO2).

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Electrochemical deoxidation of ZrSiO4 in molten calcium chloride

Cited by 4 publications

References 8 publications

Study on the Influence of CaO on the Electrochemical Reduction of Fe2O3 in NaCl-CaCl2 Molten Salt

Study on the Influence of CaO on the Electrochemical Reduction of Fe2O3 in NaCl-CaCl2 Molten Salt

Thermodynamics of Fe Reduction in Melts Electrolysis

Processing of Zirconium Oxide Raw Materials to Produce Zirconium Silicides via Electrolysis of KCl-K₂SiF₆-ZrO₂ Melt

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Electrochemical deoxidation of ZrSiO4 in molten calcium chloride

Cited by 4 publications

References 8 publications

Study on the Influence of CaO on the Electrochemical Reduction of Fe2O3 in NaCl-CaCl2 Molten Salt

Study on the Influence of CaO on the Electrochemical Reduction of Fe2O3 in NaCl-CaCl2 Molten Salt

Thermodynamics of Fe Reduction in Melts Electrolysis

Processing of Zirconium Oxide Raw Materials to Produce Zirconium Silicides via Electrolysis of KCl-K2SiF6-ZrO2 Melt

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Processing of Zirconium Oxide Raw Materials to Produce Zirconium Silicides via Electrolysis of KCl-K₂SiF₆-ZrO₂ Melt