Abstract
The combined model which was developed and validated in Part I of this paper was used to perform parametric studies for the Alcoa A622 refining process of aluminum in order to optimize the operation. The dependency of the removal efficiency of the impurity elements on some operational parameters is discussed. The results indicated that an injection of MgC12 and KCl powders can achieve the same removal effect as injection of C12. The calculation by the combined model shows that the powder injection rate is the controlling step when the average size of powder is very small and the mass transfer of impurity elements is the controlled step when the powder injection rate is high. For the removal of sodium and with other parameters kept the same, MgC12 and KCl powders contribute most when the powder size is small, while the argon gas contributes most when the powder size is large.
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