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Extensive efforts have been undertaken due to environmental pressures and the increasing scarcity of good quality coking coal to develop alternative processes for iron-making to the conventional blast furnace route. So far, COREX, a smelting reduction process, has emerged as one of the most promising alternatives. It is the first commercially established and industrially proven smelting reduction process based mainly on non-coking coal, which capable of meeting the economical and environmental requirements.1–3) However, the COREX-3000, designed productivity of which is 1.5 million tons per year, still has some disadvantages. For example, the sulfur content of COREX hot metal (HM) is higher on average and has more severe fluctuations than that of the blast furnace (BF). The detailed description of the problem in COREX hot metal and transfer process of sulfur were listed in the authors’ previous paper.4) Sulphur is a problematic impurity in the steelmaking industry that contributes to the embrittlement of steel on account of the formation of continuous intergranular liquid films in the solidified steel. This promotes intergranular weakness and solidification cracking of the metal.5) Accordingly, the desulfurization of hot metal is a vital part of the steelmaking process since sulfur in many steel products is detrimental. In general, desulfurization of hot metal is more economical than desulfurization of steel, and about 90 pct of the hot metal produced in blast furnace is desulfurized before it is sent to be processed in a steelmaking furnace.6) Improving the Desulphurization in COREX-3000 Process by the Optimization of Chemical Compositions of Slag