In this study numerical simulation of the flash furnace copper smelting was carried out to investigate the pollutants formation in combustion of sulfide concentrates and ancillary fuels. This simulation was done with use of Eulerian framework for continuous phase flow field and Lagrangian approach for discrete phase particles. For modeling of combustion flow and applying turbulence effects on the rate of chemical reactions the composition of Probability Density Function (PDF) and RNG, k-ε model were used. Due to the thermodynamic condition of flash smelting furnace, the combustion of sulfur which exists in concentrate particles, occurs explosively and with high radiation. To calculate the effect of radiative heat transfer the discrete ordinate method (DOM) was used. The numerical simulation results show, under combustion conditions with extra air and at partly high temperatures (>1273K) the only noteworthy sulfurous species are SO2 and in colder points SO2 is transformed to SO3. In the points where there is not sufficient oxygen, the concentration of SO, and S2 unburned are increased. The results also show, the maximum temperature is decreased with increase of existing sulfur in the concentrate particles and the minimum temperature is increased, because the radiation intensity is increased, so the furnace temperature is more uniform. This behavior has a significant influence on reduction of thermal NOx emission.

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