Acomputer program system was developed to simulate the smelting reduction ironmaking process. This system, combining the database MALT with the phase equilibrium calculation software ChemSage-derived from the widely well-known SOLGASMIX, can be expected to deal with problems encountered in metallurgical processes. As an example, the behaviors of some recycling elements, such as Na. K, Zn and S, in the smelting reduction process have been investigated from the thermodynamicpoint of view in case

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... f the dust being recycled. The simulation results indicate that Zn is most influential on sulphur behavior among Zn, Na and K, and ZnS is the prevailing form of the deposited sulphur when there is zinc existing in the system. Zn can effectively prevent sulphur from entering the outlet gas. Alkaline components, especially potassium K, accumulate as carbonates in the system. At a high post combustion ratio of the gas generating from the smelting reduction furnace, or at a lower temperature of Cooler I . FeSdeposition takes place and results in an appreciable amount of sulphur leaving the system in the outlet gas.