Taphole Clay Composition Factors -- design according to Blast Furnace

To keep the tap hole under steady operation, taphole clay should have volume stability and good workability, easy sintering and open-up, good molten iron and slag resistance, good thermal shock resistance.Anhydrous taphole caly is very polular due to its better performance.

Here are the composition factors of taphole clay:

Binding Agent

Tar and modified resin are the main binding agent for anhydrous taphole clay,which also add plasticity to taphole clay.During sintering, taphole clay is carbon-boned thanks to carbonization of tar and modified resin.This improve the strength of taphole clay and assure the tapping time.

Bitumen

Melting of bitumen can fill up the joint of taphole clay when operation.Thus increase the adhension of taphole clay. Meanwhile, carbonization of bitumen will also increase high temperature performance of taphole clay. Appropriate additon of bitumen can increase the strength of taphole clay significantly.While over addition will cause coking and reduce the strength of taphole clay.

Coke

Coke as part of  aggregate of taphole clay can prevent it from over sintering and improve the resistance to hot metal and slag. Too many coke will increase the apparent porosity and low down the strength. On the contrary, taphole clay has bad air permeability, which will induce humid taphole clay.

Above all, to have a good product and achieve good performance, we must learn the real blast furnace operation very well and product should be designed according to the real requirements.

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