Material composition and properties of self-flowing refractory castables for tapping trenches

In the large and medium-sized blast furnace tapping ditch, Al2O3-SiC-C refractory castables are generally used. In order to improve the medium temperature performance, a sintering agent such as borax is added to increase the amount of primary iron in one pass; in the small and medium sized blast furnace tapping On the ditch, the material is also poured, and the same material is used. The binder is replaced with an organic binder such as phenolic resin and medium-temperature asphalt powder, which can be used without being baked. The self-flowing refractory castable is applied in the blast furnace tapping ditch, and it has been in recent years, and the construction is convenient and the use effect is good. For example, in the 3200m3 and 2500m3 blast furnace tapping trenches, the amount of iron passing exceeds 100,000 tons, and the corrosion rate is about 1.36mm/ktp.

The properties and material composition of self-flowing refractory castables for tapping trenches are as follows: No. 1, 2, 5 using fused corundum corundum as refractory aggregate, using fused white corundum, 97 silicon carbide, ball pitch or medium temperature asphalt powder, calcined and oxidized Aluminum powder and silica fume are used as refractory powders. No. 3 and 4 use fused white corundum as refractory aggregate, and the others are the same as the above materials. The binder was made of CA70 cement and a composite water reducing agent was added. In order to quickly bake the iron ditch lining to meet the production needs, in the self-flowing refractory castable, an anti-explosive agent or a quick-drying agent such as metal aluminum powder and explosion-proof fiber is generally added. The material can be baked in 24 hours and put into normal use, so it is also called quick-drying refractory castable.

It can be seen from the table that the water consumption of the self-flowing refractory castable for the tapping ditch is small, and the flow value is between 180 and 240 mm, which can fully achieve the self-flow forming, exhausting and densification, and other performance indexes and the same material. The vibration refractory castable is similar, so it has a good use effect.

Remarks: The information on the above castables is about “material composition and performance of self-flowing refractory castables for tapping trenches” provided by Zibo Yuneng Kiln Technology Co., Ltd. For more information or to consult the price of refractory castables, please contact