高炉矿渣是炼铁过程中所产生的废渣。炼铁炉在高温下将氧化铁还原成金属铁,并将矿石中的二氧化硅、三氧化二铝等杂质与石灰等熔剂化合成矿渣并使之与铁水分离。由于矿渣比重比铁小,因而浮于铁水表面在铁水之前排出。矿渣的化学成份主要为:SiO_2 38～45%; Blast furnace slag is the residue produced during the ironmaking process. The iron-making furnace reduces iron oxide to metallic iron at a high temperature, and melts the impurities such as silica, alumina, etc. in the ore and lime, etc., to synthesize the slag and separate it from the molten iron. Since the slag has a smaller specific gravity than iron, it floats on the surface of the molten iron before it is discharged. The chemical composition of slag is mainly: SiO 2 38-45%;