Method for protecting blast furnace by using slag with high Al2O3 content

The invention discloses a method for protecting a blast furnace by using slag with high Al2O3 content, and belongs to the field of ferrous metallurgy. The method comprises the following steps: preparing a sintering raw material, sintering to obtain high Al2O3 sintered ore, adding the high Al2O3 sintered ore into a blast furnace to carry out blast furnace ironmaking and furnace protection, and finally controlling the contents of Al2O3 and MgO in furnace slag to complete blast furnace protection. According to the invention, Al2O3 is not reduced in the blast furnace, and all Al2O3 enters slag. The steel quality is ensured, and the post-treatment procedure is also reduced. 本发明公开了一种使用高Al2O3含量炉渣高炉护炉的方法，属于钢铁冶金领域。本发明首先配置烧结原料，然后烧结得到高Al2O3烧结矿，再将高Al2O3烧结矿加入高炉中进行高炉炼铁和护炉，最后控制炉渣中Al2O3和MgO的含量，完成高炉护炉。本发明中的Al2O3不会在高炉内部被还原，Al2O3全部进入炉渣。保证了钢材质量，也减少了后处理的工序。