A GENERIC SYSTEM OF PLANT IMPURITY BALANCE MODELS: FURTHER IMPROVEMENTS

Bahri, P., Beckham, K., Brown, G., Fillery, E., Langa, J., Lee, T.T., Nooraii, A., Olszewski, Z., Riley, G., White, D.

This paper presents an update on improvements to the generic system of plant-wide impurity balance models (IBMs) discussed in the last International Alumina Quality Workshop (Riley et al. 2002). Following the successful initial global deployment of the Alcoa plant-wide model, to ensure ongoing support from the software vendor, we have converted the original models to a new platform. In the process, these converted models have been further enhanced, not only to include precipitation yield prediction but also inclusion of a number of important improvements in knowledge of Bayer process chemistry, and development of a semi-dynamic mode of operation (for modelling effects of lake volume changes). A new model interface system has also been developed as part of the software conversion project. The enhanced Alcoa generic system of plant-wide IBMs has gained significantly wider usage, from regular and advanced model users.