Whilst laboratory research has shown that some properties of alumina will affect its speed of dissolution, they have also shown that most, if not all, aluminas can be made to dissolve fast if the conditions are optimum. The initial thermal effect and dispersion (which are design and operation related) have a greater impact than structural properties of the alumina. These, in turn, indicate that the design and location of feeder, the local bath volume and its superheat are all important.
Thus, with this background knowledge the designs can be modified as well as operating conditions and procedures. The impact of these changes on reducing alumina related problems will be discussed.