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When low-grade nickel matte is blown into a converter to produce high-grade nickel matte, a large amount of slag is generated, which contains many valuable elements, such as Ni, Co, and Cu.1) Generally, nickel converter slag is diluted in an electric dilution furnace by adding coal and pyrite, then the slag is discharged from the upper outlet of the furnace, and the matte is discharged from the lower outlet; however, the process requires a long treatment time and has a poor dilution effect because coal is always floating on the surface of the molten slag.2) The FeOx–SiO2 slag system constitutes the main part of nickel converter slag, where a variety of metals exist in the dissolved state or as inclusions.3) Nickel mainly exists in the sulfide form (Ni3S2), while some of the nickel is dissolved in fayalite in the oxide form. Cobalt is mostly distributed in the silicate in the form of oxides (CoO), while almost all the copper is dispersed in the slag in the sulfide form (Cu2S). Owing to the violent agitation in the converter causing poor separation of the slag and matte, a large number of matte particles are dispersed in the molten slag even after dilution, which is the main reason for the loss of nickel and copper in nickel converter slag.4,5) The key factors affecting the separation of matte from Recovery of Fe, Ni, Co, and Cu from Nickel Converter Slag through Oxidation and Reduction