Function of taphole clay

Stemming is used to seal the taphole refractory, at present there are water stemming and can be divided into two types: anhydrous stemming, the former is used in low pressure, strengthening smelting degree is not high, the small blast furnace, the latter in high top pressure, high degree of intensification of smelting of large and medium blast furnace.
Stemming form can be divided into two parts - refractory aggregate and binder. Refractory aggregate means corundum, mullite insulating firebrick, flint clay and other refractory raw material and modified materials such as coke, mica.Binder for water or organic material such as tar pitch and phenolic resin, also adding SiC Si3N4, expansive agent and additive, etc.Aggregate in a certain size and weight matrix, under the harmonic of binder has certain plasticity, thus can through the mud gun hitting iron mouth to block the molten iron.
With water as a bond is called the water stemming, tar, organic material such as resin as binder, called anhydrous stemming.

Main functions:
1) Wall, taphole requirements stemming good filling and sintering;
2) The stability of the iron to stemming easy open hole and resistance to erosion, erosion;
3) Protecting hearth, demand stemming rapid heating without crack, and the combination of old and new stemming high strength;
4) The opening performance is good, open machine drilling bit easily;
5) Moderate plasticity, facilitate mud gun operation and the formation of iron mouth balling;
6) Good volume stability, small volume change at high temperature, not contraction due to leakage of hot metal.

Anhydrous stemming advantages:
1) High strength, and maintain the stability of blast furnace condition (iron mouth depth, the tapping time fluctuations, whole taphole wind rate, etc.) is of great importance, which makes the blast furnace has a production base.
2) Slag resistance is strong.Stemming consumption is low, the general water cannon is one 5 of the mud.
3) It has a certain expansion performance. Have appropriate porosity and strength, can adapt to more than 2000 m.The large blast furnace use.
Article Source: Function of taphole clay
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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