"blast furnace slag" refers to the molten material formed during the blast furnace smelting of iron ore, resulting from the combination of gangue in the furnace charge, flux, and part of the furnace materials with generated slag. After being discharged, cooled, and processed, it becomes a solid by-product. Through further processing such as collection, crushing, and grinding, it can be reused as a cement admixture, concrete supplementary material, highway construction material, or raw material for mineral wool.