Investigation of freeze-linings in aluminum production cells

Fallah-Mehrjardi, Ata, Hayes, Peter C. and Jak, Evgueni (2014) Investigation of freeze-linings in aluminum production cells. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 45 4: 1232-1247. doi:10.1007/s11663-014-0078-z

Author Fallah-Mehrjardi, Ata
Hayes, Peter C.
Jak, Evgueni
Title Investigation of freeze-linings in aluminum production cells
Journal name Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science   Check publisher's open access policy
ISSN 1073-5615
Publication date 2014-08
Year available 2014
Sub-type Article (original research)
DOI 10.1007/s11663-014-0078-z
Open Access Status
Volume 45
Issue 4
Start page 1232
End page 1247
Total pages 16
Place of publication New York, NY, United States
Publisher Springer New York
Collection year 2015
Language eng
Abstract The molten cryolite bath creates chemically a very aggressive environment in the Hall-Héroult cell, and thus, the formation of a protective solid layer (freeze-lining) on the cell wall is essential for the operation of the present cell designs. To provide further information on the formation of the freeze-lining deposit in this system, laboratory-based studies were undertaken using an air-cooled probe technique The effects of process conditions, i.e., time, bath agitation, and superheat on the microstructures, morphologies of the phases, and the phase assemblages adjacent to the deposit/bath interface were investigated. A detailed microstructural analysis of the steady-state deposits shows that a dense sealing primary-phase layer of cryolite solid solution was formed at the interface of the bath deposit for the process conditions examined. The formation of sealing primary-phase layer at the bath/deposit interface explicitly indicates that the deposit/liquid bath interface temperature is equal to that of the liquidus of the bulk bath. The experimentally investigated liquidus temperature and subliquidus equilibria differ significantly from those previously reported.
Keyword Cells
Fluoride minerals
Phase interfaces
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
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