The composition of Refractory Taphole Clay can be divided into two parts - refractory aggregate and binder. Refractory aggregate refers to refractory raw materials such as corundum, mullite, coke gemstone and modified materials such as coke and mica. The binder is water or organic materials such as tar asphalt and phenolic resin, and is also mixed with SiC, Si3N4, expansion agent and admixtures. Aggregates are composed of a matrix according to a certain particle size and weight, and are blended with a binder to give it a certain plasticity, so that it can be driven into the iron mouth through a mud gun to block the molten iron.
The one with water as a binder is called water-based taphole mud, and the one with tar, resin and other organic materials as a binder is called anhydrous taphole mud.
Advantages of anhydrous taphole mud
1) High strength, and it is of great significance to maintain the stability of the blast furnace conditions (iron mouth depth, tapping time fluctuation, full wind plugging rate, etc.), so that the blast furnace has a basis for increasing production.
2) Strong slag resistance. The unit consumption of taphole mud is low, generally one-fifth of that of water taphole mud.
3) It has certain expansion performance. It has suitable porosity and strength, and can be used in large blast furnaces over 2000m³.
Domestic blast furnaces all use tar-bonded taphole mud, all based on cost considerations. The combined tar of this taphole mud releases a large amount of benzopyrene once heated. It is a very strong carcinogen and is extremely harmful to the environment and the health of workers. Therefore, it is urgent to develop a non-toxic and cheap binder.
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