Anode film formation and control

Patent · Mon Jan 01 00:00:00 EST 1990

OSTI ID:867360

Koski, Oscar ^[1]; Marschman, Steven C ^[1]

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1. Richland, WA

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.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• DOE Contract Number: AC06-76RL01830
• Assignee: Battelle Memorial Institute (Richland, WA)
• Patent Number(s): US 4921584
• OSTI ID: 867360
• Country of Publication: United States
• Language: English

Related Subjects

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
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