Due to the need to withstand the severe erosion of molten iron and slag, as well as the chemical corrosion and permeability of high-temperature molten iron and slag, the castables used in blast furnace ladles generally have the characteristics of high temperature, strong corrosion resistance, and strong resistance to thermal shock, penetration, and erosion.

The tapping groove of a blast furnace is a necessary path for molten iron, and its operating temperature is usually around 1300~1500 ℃, which belongs to the part with higher operating temperature. The tapping groove of a blast furnace mainly consists of a main groove, a straight groove, a slag groove, and a skimmer, and its working mode varies depending on the design. In recent years, the continuous development of the ironmaking industry has led to the continuous improvement of blast furnace shapes, and the construction of refractory castables for blast furnace tapping channels has become increasingly strict.

The refractory castable used in the blast furnace tapping groove must meet the following conditions:

1. High strength wear resistance and erosion resistance;

2. Anti erosion and antioxidant properties;

3. Volume stability, overall stability, and high temperature stability;

4. Large iron flow, less prone to slag adhesion, and easy to repair during construction;

5. Good insulation and flowability.

The refractory castable used in the construction of blast furnace iron trenches is generally an amorphous refractory material composed of main raw materials such as fused alumina, sintered alumina, special grade bauxite clinker, and fixed carbon content of 90-95% or more, as well as silicon carbide, which are mixed and prepared. During construction, the material is prepared by adding a binder that matches the material, and then poured.

Not only that, when selecting or constructing castables for the blast furnace tapping groove, the following points must be noted:

When storing refractory castables, it is necessary to do a good job of "three prevention" to avoid poor results during use;

During the construction of the blast furnace tapping groove, it is necessary to select suitable refractory materials according to the usage situation;

3. Choose a reasonable construction method based on the area to be repaired;

4. Prohibit the use of substandard refractory castables;

5. Regularly inspect the parts of use to avoid causing major trouble due to small mistakes not being discovered.

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