• Spent potlining

For current to conduct in the pot, there must be an anode and a cathode. The carbon cathode is at the bottom of the pot, isolated by refractories along the bottom and sidewalls of the pot. After several years of operation, cathodes become saturated with contaminants and must be replaced. At this point, a residue known as spent potlining is generated. This is a hazardous waste that must be managed appropriately.





Alcoa supplies spent potlining to a number of plants worldwide (mainly cement plants), which beneficially use them to produce energy or as a mineralizer. Waste that cannot be recycled or beneficially used is sent to Alcoa’s Gum Springs plant in the United States for treatment and disposal.
A team comprised of Alcoa experts and environmental specialists from all global regions share information about existing and emerging recycling alternatives, as well as needs and business conditions in the recycling market, in an ongoing effort to identify recycling opportunities for this waste.