Anode film formation and control

Patent · Tue May 01 04:00:00 EDT 1990

OSTI ID:7022079

Koski, O; Marschman, S C

A protective film is created about the anode within a cryolite-based electrolyte during electrolytic production of aluminum from alumina. The film functions 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. 3 figs.

• DOE Contract Number: AC06-76RL01830
• Assignee: Battelle Memorial Inst., Richland, WA (United States)
• Patent Number(s): A; US 4921584
• Application Number: PPN: US 7-116560
• OSTI ID: 7022079
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ANODES
CHALCOGENIDES
COATINGS
CORROSION PROTECTION
ELECTRODES
ELECTROLYSIS
ELECTROLYTIC CELLS
LYSIS
OXIDES
OXYGEN COMPOUNDS
PROTECTIVE COATINGS