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Title: Anode film formation and control

Abstract

A protective film is created about the anode within a cryolite-based electrolyte during electrolytic production of aluminum from alumina. The film function to minimize corrosion of the anode by the cryolitic electrolyte and thereby extend the life of the anode. Various operating parameters of the electrolytic process are controlled to maintain the protective film about the anode in a protective state throughout the electrolytic reduction of alumina. Such parameters include electrolyte temperature, electrolyte ratio, current density, and Al.sub.2 O.sub.3 concentration. An apparatus is also disclosed to enable identification of the onset of anode corrosion due to disruption of the film to provide real time information regarding the state of the film.

Inventors:
 [1];  [1]
  1. Richland, WA
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
OSTI Identifier:
867360
Patent Number(s):
US 4921584
Assignee:
Battelle Memorial Institute (Richland, WA)
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
anode; film; formation; control; protective; created; cryolite-based; electrolyte; electrolytic; production; aluminum; alumina; function; minimize; corrosion; cryolitic; extend; life; various; operating; parameters; process; controlled; maintain; throughout; reduction; temperature; ratio; current; density; concentration; apparatus; disclosed; enable; identification; onset; due; disruption; provide; time; information; regarding; electrolytic process; electrolytic production; current density; electrolytic reduction; operating parameters; information regarding; minimize corrosion; film formation; operating parameter; /205/

Citation Formats

Koski, Oscar, and Marschman, Steven C. Anode film formation and control. United States: N. p., 1990. Web.
Koski, Oscar, & Marschman, Steven C. Anode film formation and control. United States.
Koski, Oscar, and Marschman, Steven C. 1990. "Anode film formation and control". United States. https://www.osti.gov/servlets/purl/867360.
@article{osti_867360,
title = {Anode film formation and control},
author = {Koski, Oscar and Marschman, Steven C},
abstractNote = {A protective film is created about the anode within a cryolite-based electrolyte during electrolytic production of aluminum from alumina. The film function to minimize corrosion of the anode by the cryolitic electrolyte and thereby extend the life of the anode. Various operating parameters of the electrolytic process are controlled to maintain the protective film about the anode in a protective state throughout the electrolytic reduction of alumina. Such parameters include electrolyte temperature, electrolyte ratio, current density, and Al.sub.2 O.sub.3 concentration. An apparatus is also disclosed to enable identification of the onset of anode corrosion due to disruption of the film to provide real time information regarding the state of the film.},
doi = {},
url = {https://www.osti.gov/biblio/867360}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}