Method for inhibiting resulfurization of molten steel tank by flushing tank with acid slag

The method comprises the following steps that S1, a steel grade with the component standard S being smaller than or equal to 0.045% is selected as a tank washing steel grade, molten iron and common waste steel are added into a converter to be blown, when the molten iron enters the converter, the S content of tapping of the converter is controlled, and tapping is conducted into the molten steel tank; s2, the molten steel tank enters a refining LF furnace to be heated; s3, the alloy content is adjusted, 2.5-4 kg of quartz sand is added into each ton of molten steel to make acid slag, and the alkalinity of the molten slag is controlled to be smaller than 1.0; and S4, the molten steel is cast and turned over in time, slag on the wall of the molten steel tank and slag on the edge of the molten steel tank are immediately cleaned after the molten steel tank is turned over, and the treated molten steel tank can be used for ultra-low sulfur steel production. The alkalinity of the slag is controlled to be smaller than