ADDITION OF LITHIUM CARBONATE TO THE ANODE PASTE USED IN SODERBERG CELLS
(1.Department of Nonferrous Metallurgy,Northeaster,University,Shenyang 110006;
2.Department of Chemistry,University of Oslo,Oslo,Norway;
3.Hydro Aluminiurn,N-1321,stabekk,Norway)
2.Department of Chemistry,University of Oslo,Oslo,Norway;
3.Hydro Aluminiurn,N-1321,stabekk,Norway)
Abstract: Laboratory studies showed that addition of about 0.5%(in mass) Li2CO3,to the anode used in an aluminium electrolysis cell gave increased wetting of the anode by the cryolite-alumina melt，increased critical current density and reduced anodic overvoltage. The lithium carbonate then acted as acatalyst far the oxidation reactioa between the anode carbon and the oxide-containing ions in the melt. Anade paste containing lithium carbonate has been employed in Chinese aluminium smelters with 62Ka HSS cells. This lead to improved eurrerit efficiency, reduced cell voltage and energy Consumption, as well as fewer anode effects per day.
Key words: lithium carbonate anode paste Soderberg cell