Towards the Stability of Low-Temperature Aluminum Electrolysis

Suzdaltsev, Andrey; Nikolaev, A. Yu.; Zaikov, Yu. P.

doi:10.1149/1945-7111/abf87f

Cited by 24 publications

(12 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reduction of aluminum on tungsten begins at potentials more negative than 0 V in KF-AlF 3 -Al 2 O 3 (vs. Al reference electrode) [25] and about −0.6 V in NaF-AlF 3 -Al 2 O 3 (vs. W reference electrode) [26]. In both cases, there was a peak related to Al-W compound formation observed in the cyclic voltammograms.…”

Section: Introductionmentioning

confidence: 93%

“…At least one cathodic peak R1 related to aluminum reduction and one wave R2 associated with lithium reduction were observed at all temperatures. The reduction of lithium was assumed based on the standard electrode potential with respect to aluminum and previous articles [24,25]. The anodic peaks of aluminum O3 and lithium O1 oxidation are also present at all temperatures but not at all sweep rates.…”

Section: Effect Of Electrolyte Compositionmentioning

confidence: 99%

“…The present work is devoted to enhancing the understanding of the electrochemical behavior of aluminum in the LiF-AlF 3 melt with various compositions in the presence of the spent catalyst at 740-800 • C. The tungsten rod was used as an electrode because the material possesses high chemical stability towards liquid aluminum and the cathode process on tungsten has been widely studied in fluoride and chloride melts [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Towards Understanding the Cathode Process Mechanism and Kinetics in Molten LiF–AlF3 during the Treatment of Spent Pt/Al2O3 Catalysts

Yasinskiy

Padamata

Stopić

et al. 2021

Metals

View full text Add to dashboard Cite

Electrochemical decomposition of spent catalyst dissolved in molten salts is a promising approach for the extraction of precious metals from them. This article reports the results of the study of aluminum electrowinning from the xLiF–(1-x)AlF3 melt (x = 0.64; 0.85) containing 0–5 wt.% of spent petroleum Pt/γ-Al2O3 catalyst on a tungsten electrode at 740–800 °C through cyclic voltammetry and chronoamperometry. The results evidence that the aluminum reduction in the LiF–AlF3 melts is a diffusion-controlled two-step process. Both one-electron and two-electron steps occur simultaneously at close (or same) potentials, which affect the cyclic voltammograms. The diffusion coefficients of electroactive species for the one-electron process were (2.20–6.50)∙10−6 cm2·s–1, and for the two-electron process, they were (0.15–2.20)−6 cm2·s−1. The numbers of electrons found from the chronoamperometry data were in the range from 1.06 to 1.90, indicating the variations of the partial current densities of the one- and two-electron processes. The 64LiF–36AlF3 melt with about 2.5 wt.% of the spent catalysts seems a better electrolyte for the catalyst treatment in terms of cathodic process and alumina solubility, and the range of temperatures from 780 to 800 °C is applicable. The mechanism of aluminum reduction from the studied melts seems complicated and deserves further study to find the optimal process parameters for aluminum reduction during the spent catalyst treatment and the primary metal production as well.

show abstract

Section: Introductionmentioning

confidence: 93%

Section: Effect Of Electrolyte Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Towards Understanding the Cathode Process Mechanism and Kinetics in Molten LiF–AlF3 during the Treatment of Spent Pt/Al2O3 Catalysts

Yasinskiy

Padamata

Stopić

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…Moreover, Unlike the discussed Hoopes refining Process that necessitates the use of high temperatures and considerable energy amounts, lower temperature electrolysis has a much more economic nature and can also lead to the production of high-quality Al parts up to 99.89% purity [28]. In this process, the need to be refined aluminum (serves as an anode) is put in the anhydrous aluminum chlorides solution as an ionic liquid, but unfortunately, this method cannot be used in melt [42,43].…”

Section: Hoopes Process and Three-layer Electrolysismentioning

confidence: 99%

Melt refining and purification processes in Al alloys: a comprehensive study

Wu¹,

Djavanroodi²,

Göde³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

Aluminum and its alloys having lots of advantageous properties are among the most-used metallic materials. So, it is of immense importance to find suitable processes and methods leading to high-quality purified Al melt. In this regard, there are numerous challenges in achieving high purity Al melts, such as its propensity to react with air, oxygen, and water vapor, the presence of a variety of oxide, non-oxide, and solid particle inclusions that lead to the production of pores, cracks, pinholes, and dross, finally adversely influencing the overall quality of the product. The main methods of melt refining are fluxing, floatation, and filtration, but more sophisticated methods have also emerged. The best method for purification can be chosen based on the type of impurities and the desired level of purification. With the industrial development, the need to establish more cost-effective and simpler methods has increased, and in addition, methods should be considered for recycling large volumes of scarp Al parts that contain more impurities. Moreover, achieving high purity melt is also a vital issue for use in specific applications. The present article has been written to discuss the above issues and focus on the study of various methods of aluminum purification.

show abstract

“…Some fluorides, such as lithium and potassium, can enter the bath with alumina [5,6]. In the last decade, there has been an increase in the number of publications devoted to a detailed study of potassium-containing electrolyte [7][8][9][10][11]. For the efficiency of the electrolytic process, the composition of the multicomponent melt requires rather fine control.…”

Section: Introductionmentioning

confidence: 99%

Solid Solutions in Aluminum Electrolytes with the Participation of LiF

Zaitseva¹

2022

J. Sib. Fed. Chem.

View full text Add to dashboard Cite

The paper presents the investigation of the solid solutions formation in the fluoride system Na5Al3F14-Na3AlF6-K3AlF6 with the addition of LiF. Two local regions were under consideration. The first case concerns the possibility of potassium and sodium cations replacing with lithium in the elpasolite (K2NaAlF6) when LiF is added to the electrolyte. In the second, the effect of lithium fluoride on the chiolite (Na5Al3F14) was studied. The investigation was motivated by the need to control the composition of the electrolyte during the electrolytic production of aluminum. The electrolyte samples were obtained from the initial fluorides under laboratory conditions. Determination of crystal-chemical details of the structure of solid solutions was carried out by the method of full-profile analysis (Rietveld method) on multiphase polycrystalline samples. It was found that the addition of LiF in the structure of elpasolite is accompanied by a gradual substitution of lithium for sodium with the formation, ultimately, of the K2LiAlF6 phase with the lattice parameter a = 8.0779 Å. Potassium is not subject to substitution. No dissolution of LiF in the structure of cryolite (Na3AlF6) was found. It was shown that chiolite does not form solid solutions with LiF upon crystallization

show abstract

Towards the Stability of Low-Temperature Aluminum Electrolysis

Cited by 24 publications

References 47 publications

Towards Understanding the Cathode Process Mechanism and Kinetics in Molten LiF–AlF3 during the Treatment of Spent Pt/Al2O3 Catalysts

Towards Understanding the Cathode Process Mechanism and Kinetics in Molten LiF–AlF3 during the Treatment of Spent Pt/Al2O3 Catalysts

Melt refining and purification processes in Al alloys: a comprehensive study

Solid Solutions in Aluminum Electrolytes with the Participation of LiF

Contact Info

Product

Resources

About