Investigation of the Influence of Heat Balance Shifts on the Freeze Microstructure and Composition in Aluminum Smelting Bath System: Cryolite-CaF2-AlF3-Al2O3

Liu, Jingjing; Fallah-Mehrjardi, Ata; Shishin, Denis; Jak, Evgueni; Dorreen, Mark; Taylor, Marilyn

doi:10.1007/s11663-017-1109-3

Cited by 11 publications

(2 citation statements)

References 15 publications

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“…The relatively dense region towards the bottom of the samples, visible in figures 1 and 3 is most likely due to the rapid freezing of bath on the ladle -consistent in structure and composition to that observed by Liu et al [10] in cold finger experiments. Correspondingly, a rapidly frozen layer is expected to form on the alumina raft as well -possibly explaining the presence of multiple layers, here observed as a non-monotonous change in properties.…”

Section: Xrdsupporting

confidence: 80%

“…Walker et al [6] and Kaszas et al [7] generated compact alumina cylinders which were immersed in bath and removed for analysis after a given time, identifying a layered structure consisting of solidified bath, alumina infiltrated with bath of varying composition and finally dry alumina. The solidified bath on alumina samples is similar to that reported with respect to side ledge and crust, [9] and [10], and on anodes [11]: a dense layer was found where the bath had undergone rapid cooling, while a more porous layer was identified in regions where cooling was slower.…”

Section: Introductionsupporting

confidence: 78%

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The Micro- and Macrostructure of Alumina Rafts

et al. 2019

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As alumina particles are fed to aluminium reduction cells, a frozen layer of bath is typically formed on the particle surface, due to the relatively low bath superheat. For particles in close proximity, platelets with frozen bath can be formed, resulting in agglomerates (rafts) containing solidified bath and alumina. The formation, flotation and break up of these agglomerates is determined by macroscopic properties (i.e. size, density etc.) which in turn is related to microscopic properties, i.e. how grains are interconnected. The formation of rafts delays the dissolution of alumina and thus adversely influences the conditions in the pot. In order to obtain more knowledge on the conditions for raft formation, an industrial measurement campaign was performed at Alcoa Mosjøen in which raft where collected under different operating conditions. Rafts have been characterized by micro computed

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Section: Xrdsupporting

confidence: 80%