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|Flash smelting is a complex and capital intensive technology. Although in use for 50 years the technology is still not well understood from a fundamental point of view and thus uncertainty is evident when significant change to the practice is necessitated. The application of effective design and process simulation tools has significant advantages when process change and improvement is required. Mathematical models have been used to simulate the processes occurring in the shafts of copper flash smelters. The present approach to flash furnace modelling differs from earlier work in that the burners were modelled in detail, the output from the burner model becoming the input to the shaft model. This paper serves as an introduction to the modelling process used to analyse the performance and provide a better understanding of the parameters applicable to the flash furnace at the Kalgoorlie Nickel Smelter.|