Processes in refractory materials of the cathode assembly of electrolysis cells for aluminum production

Pogodaev, A. M.; Proshkin, A. V.; Polyakov, P. V.; Shimansky, Alexander F.; Yakimov, Igor S.; Yarosh, I. A.

doi:10.3103/s1067821210040048

Cited by 2 publications

(1 citation statement)

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“…The generated reaction of Al4C3 can also proceed in the presence of NaF and aluminum because NaF easily reacts with aluminum to form metal sodium (Eqs. 7 and 8) when temperatures exceed 900°C [29][30][31], as given by Al+3NaF=AlF3+3Na…”

Section: Characterization Of Products Formed By Aluminum/na-gics Reacmentioning

confidence: 99%

Mechanism of aluminum carbide formation in aluminum electrolysis cells

Wang

Hao

Peng

et al. 2020

J min metall B Metall

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The formation and dissolution of aluminum carbide is considered the primary factor affecting the life of aluminum electrolysis cells. Herein, the characteristics of sodium-graphite intercalation compounds (Na-GICs)were measured and the formation mechanism of Al4C3duringthe aluminum electrolysis process was experimentally studied. The Na-GIC characteristics and the products of aluminum and Na-GIC reactions were investigated by Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. The results showed that graphite can react with the sodium metal to form Na-GICs, which were detectable by Raman spectroscopy. Sodium that inserted into the graphite layered structure acted as an intercalation agent to change the original graphite layered structure and increase the volume and specific surface area of graphite. Further, Al4C3wasproduced by using sodium-graphite intercalation compounds and aluminum as materials. Thus, the presence of sodium plays an important role in the formation process of Al4C3in aluminum electrolysis cells.

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Section: Characterization Of Products Formed By Aluminum/na-gics Reacmentioning

confidence: 99%