Abstract
The widespread introduction of new technology such as alumina pot gas scrubbing systems and stationary calciners has created an increased interest in understanding alumina behavior in smelters so that overall costs can be reduced. Alumina properties significantly affect dry gas scrubbing, material handling, dust losses, anode oxidation, pot crust strength, heat loss through the cover, electrolyte composition and mass balance, alumina feeding and dissolution, and metal purity. Consistent alumina quality, or the knowledge to cope with changes in it, are essential requirements for meeting the high process control standards of a modern smelter. A methology for preparing realistic alumina specifications and highlighting of promising areas for development is presented.
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