Preparation method of low-cost magnesia-carbon slagging material and method for using low-cost magnesia-carbon slagging material in converter

The invention belongs to the technical field of smelting, and discloses a preparation method of a low-cost magnesia-carbon slagging material and a method for using the low-cost magnesia-carbon slagging material in a converter. The method comprises the following steps: turning a waste tundish in a continuous casting process of a steel mill to obtain a waste magnesium refractory material, classifying and crushing the waste magnesium refractory material, proportioning the crushed waste magnesium dry material, coke powder and an adhesive according to a ratio, uniformly mixing, preparing blocks, and baking to obtain the magnesium-carbon slagging material. When scrap steel is added into the converter, the steel slag and the scrap steel are added into the converter for use. The magnesia-carbon slagging material prepared by the invention is used in a converter, and the production cost can be reduced. Meanwhile, the problem that waste refractory materials and by-products of steel plants are not easy to recycle and con