Tap-hole clay is a refractory material used to plug iron holes in ironmaking blast furnace, and its performance is directly related to the safe operation of blast furnace.
With the large scale of blast furnace, high wind pressure and discharge of a large amount of slag iron, the quality requirements of the gun-mud at the iron plug opening are getting higher and higher.
Main function
1) Plugging out the iron mouth requires that the mortar has good filling and sintering property;
2) Stable iron production requires that the mortar is easy to open iron and resistant to erosion and scouring;
3) To protect the furnace cylinder, there is no crack when the mud is heated rapidly, and the combination strength of the old and new mud is high;
4) The opening performance is good, the opening machine drill is easy to drill;
5) Moderate plasticity, easy to mud gun operation and the formation of iron mouth mud bag;
6) Good volume stability, small volume change at high temperature, no leakage of hot metal due to shrinkage.
Advantages of waterless Tap-hole clay
1) The strength is high, and it is of great significance to maintain the stable condition of the blast furnace (iron hole depth, iron time fluctuation, total air plugging rate, etc.), so that the blast furnace has the basis for increasing production.
2) Strong slag resistance. The single consumption of Tap-hole clayis low, generally one-fifth of the water Tap-hole clay.
3) There is a certain expansion performance. With suitable porosity and strength, it can adapt to more than 2000m. The use of large blast furnace.
range of application | large-scale stove | middle-sized stove | small and medium size stove | small size stove |
chemical component | SiCAl3O2 | SiCAl3O2 | SiCAl3O2 | SiCAl3O2 |
the largest particles | 60—65 | 60—65 | 55–60 | 55–60 |
Capacity after heating 1200 degrees for 3 hours(g/cm3) |
1.85 | 1.7 | 1.65 | 1.55 |
apparent porosity(<) | 36 | 32 | 34 | 36 |
compression strength
kg/cm2 |
94 | 119 | 110 | 95 |
high temperature bending strength:kg/cm2 | 16.5 | 19 | 13.5 | 12.5 |