EVALUATION OF MOTHBALLING AND SUBSEQUENT RESTARTING OF SODERBERG CELLS

摘要

In view of the latest economic changes, the worldwide aluminium producers have stopped the least cost-effective production capacities, reducing process costs and aluminium supply to the market trying to keep the price at an acceptable level. For choosing a mothballing technology, some basic requirements were taken into consideration: - minimum costs on cells shutdown, heating and restart; - minimum influence on the death age of the cells. In this paper we present our evaluation of two mothballing methods: the partial and complete metal tapping out from the cathode for vertical stud Søderberg cells.