Method for desulfurizing molten metal

Provided is a method for efficiently desulfurizing a molten metal in a short time without passing an excessive current when a potential difference is applied between slag metals. The molten metal desulfurization method uses a DC power supply, uses an electrode in contact with the molten metal as a negative electrode, uses an electrode in contact with only molten slag as a positive electrode, and applies a potential difference between the molten slag and the molten metal through the two electrodes. The method includes determining an applied current density Ja on the basis of a balance-reached S concentration [S] e0 before a potential difference is applied such that the balance-reached S concentration [S] ea when the potential difference is applied is equal to or less than a target S concentration [S] ft. 本发明提出了一种在炉渣金属间赋予电位差时不会使过量的电流通过而在短时间内高效地对熔融金属进行脱硫的方法。上述熔融金属的脱硫方法使用直流电源，将与熔融金属相接的电极作为负极，将仅与熔融炉渣相接的电极作为正极，通过两电极在上述熔融炉渣与上述熔融金属之间赋予电位差，该方法包括：根据施加电位差前的平衡达到S浓度[S]e0确定施加电流密度Ja，使得施加了电位差时的平衡达到S浓度[S]ea为目标S浓度[S]ft以下。