Method for setting electrodes in aluminum electrolysis cells

US4992146A · kind A · utility

Assignee

• NORSK HYDRO ASA · NO

Inventors

• Odd Skaar · Vinstra, NO
• Kurt Nilsson

Key dates

• Filing date: Dec 20, 1988
• Grant date: Feb 12, 1991
• Expiry date: Dec 20, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25C3/06
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A method is proposed for the setting of electrodes in electrolysis cells, especially the setting of carbonaceous anodes (3) in cells (1) for producing aluminium according to the Hall-Heroult process, where the cathode of the cells contains a bath (13) of aluminium oxide dissolved in melted cryolite, and where the aluminium metal is deposited on the bottom of the cathode. The method is characterized in that each anode, in connection with their production (assembly), is provided with reference marks (16 and 17), for instance by providing the anode rod with a paint mark, which defines a predetermined distance from the bottom side of the anode to the cathode. The anodes thereafter are positioned or set according to a rule (18) having reference points (19) each defining the expected anode consumption pr. unit of time, whereby the reference mark (16 or 17) on the anode rod should correspond to a reference point (19) on the rule (18) which is in accordance with the expected setting height. The rule (18) for each anode is fixed, for instance to the anode bars (7) of the cells, in a predetermined and equal distance from the metal plane (15). By this setting method a more even current absorp…