Method for reducing content of manganese oxide in slag

The invention discloses a method for reducing the content of manganese oxide in slag, and belongs to the technical field of metal smelting. The method comprises the steps of blast furnace tapping, converter smelting and LF refining, and is characterized in that a slag agent is added in the LF refining process for electric slag feeding, after electric slag feeding is finished, argon is softly blown for a set time or longer, MnO in refining slag is controlled to be a first threshold value, and the alkalinity of the refining slag is adjusted to be a second threshold value; a first molten steel sample is taken, slag bonding, temperature measurement and oxygen determination are carried out, then ferromanganese, ferrosilicon and lime are sequentially added, MnO in the refining slag is controlled to be a third threshold value, and the alkalinity of the refining slag is adjusted to be a fourth threshold value; and the Si content in the steel is adjusted according to the silicon content of the first molten steel sampl