Decopperization in molten steel with FeSNa2S slag was investigated in the laboratory. It was found that with an increase in FeS content of the FeSNa2S slag, the decopperization ratio increased. The decopperization ratio could reach the maximum of 716% in hot metal. The decopperization ratio was closely related to the carbon content, and the higher the carbon content, the higher was the decopperization ratio. Sulphur addition was found in the process of decopperization, and the increase in sulphur content of molten steel was about 02%-042%. However, by adding 30%-50% of BaO to the FeSNa2S slag, the addition of sulfur content in molten steel could be reduced by about 50%. The finer slag system composition was FeS∶Na2S∶BaO=40∶20∶40.
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