Semicontinuous determination of the conc

This study investigates the concentration of alumina in the electrolyte of aluminum cells through a semicontinuous chronopotentiometric method utilizing a graphite electrode within the bath of 140 kA prebaked cells. The methodology involved assessing the liquid bath's quantity via a dilution technique and monitoring the rapid dissolution of alumina during crustbreaks, while also observing occasional gradual increases. Findings indicated that, typically, about one third of the alumina dissolved quickly, whereas the remainder settled and dissolved more slowly between crustbreak events, a phenomenon termed self-feeding, particularly prevalent in cold-running cells. Higher temperatures in the bath appeared to promote self-feeding and stabilize concentration levels over time. The research aims to improve understanding of alumina dissolution dynamics to better control alumina content in the bath. Parameters such as the concentration of alumina over time, liquid bath quantity, and the amount of alumina provided were systematically analyzed. Results suggest that the primary characteristics of rapid initial dissolution followed by slower self-feeding may be consistent across varied operational contexts in aluminum cells.