Abstract
In the context of global climate change and Hydro’s focus on reducing its greenhouse gas footprint, Hydro’s Primary Metal Technology (PMT) department has been focusing on low energy pot development for the last decade. Disclosing some of the development is meant as one of Hydro’s contributions to the industry’s effort in reducing greenhouse gas production. This paper presents Hydro’s PMT experiences with the use of external potshell insulation. It presents its early uses as a tool to improve pots having cold spots, to a solution for maintaining a cathode free from bottom deposits on pots where heat input is sharply decreased, opening the door to cheap retrofitting of smelters for low energy consumption. The authors also mention recent development where external insulation is becoming part of pot design, which, along with other efforts in reducing voltage drops, allows stable pot operation below 12kWh/kg.
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