Abstract
Specific surface area should be used as the standard method for qualifying the degree of calcination of smelter-grade alumina. It is a property which is sensitive to temperature change in the calciner. The analytical method is precise, rapid, and operator-insensitive. It is thus a practical method for use in calciner control. Furthermore, for the smelter operator it is a direct measure of the performance of the alumina in a dry-scrubbing system. It is, however, a one number average property. Aluminas can vary in the spread of the degree of calcination and this can have significant effects on its behavior in use. Smelter operators should be aware of this fact and attempt to determine if the alumina is as uniform as they expect.
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