The performance of taphole clay( taphole mud or taphole gun mass) always affect operation of blast furnace a lot.
Damage for taphole clay
1. mechannical force and thermal shock
When drilling to open the tap hole, hot metal and slag run out from taphole channel, and expose taphole clay under 1500℃. During the plugging operation, the temperature will drop to 200℃ repidly. Under such repeat, thermal stree is generated in the old tap hole clay package, which will cause crack in the tap hole. In addition, during the sitering process of new tap hole clay, it is easy to incur some joints between the contact surface and lead the hot metal into the joints. When next time to open the tap hole, it is easier for hot metal flow to erode the taphole clay package.
2.Chemical Erosion
When taphole clay contacted with melton iron or slag, it is evry easy to induce some chemical reactions. In this way, taphole clay also be eroded. And the taphole channel will be expanded, hot metal flow will rush out from taphole and bring tap hole with instability.
3.Tapping Times
Appropiate less tapping times is good for tap hole maintenance. The taphole clay package can be sentirely intered and form a strong package. So that, humid tap hole and shallow tap hole less happens.
4.Tapping Method
Anhydrous taphole clay has good strength. We use alloy drill bit to open tap hole and sometimes with oxygen for lancing of tap hole. Unsteady taphole diameter and oxidization to taphole clay will reduce the stability of tap hole.
Therefore, we require taphole clay with following features:
... Easy
and reliable plugging and opening of the taphole
... Long
stable taphole
length and long tapping time, good slag resistance and pig iron resistance
... Quick
and reliable hardening of the taphole clay
... Minimize
taphole
spraying while operating
... User-friendly
by providing easier clean-out of the mud gun nozzle
... Low
emission
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