Using method for recovering refining slag and recycling in converter

The invention relates to a using method for recovering refining slag and recycling in a converter, belonging to the technical field of converter steelmaking. The using method comprises the following steps of: cooling the refining slag, then screening for removing powder, breaking into the appropriate particle size, baking and performing water removal treatment so as to produce refining return slag with the particle size of 20-40mm and the water content of less than 1%; and adding 3-10kg/t of the refining return slag after slag splashing of the converter according to the situation of converter slag, thereby reducing the temperature of the converter slag, solidifying the residual slag in the converter, thickening the converter slag, reducing the liquid slag and simultaneously reducing the oxidability of the converter slag. The refining return slag comprises the following components by weight percent: 30-70% of CaO, 7-16% of MgO, 6-30% of SiO2, 10-45% of Al2O3, 0.3-2.5% of FeO and 0.3-2.5% of TFe. The using method has the advantages of realizing the curing of the converter slag, diluting the oxidability of the converter slag, and simultaneously promoting slugging and reducing the consumption of lime in the blowing process of the converter.