Blast Furnace Tap Hole Mass...

Blast Furnace Tap Hole Mass Blast furnace tap hole mass is a prepared ready to use refractory product, made of a bond of aggregates, additives, and plasticizers. It is used to close the tap hole of a blast furnace after tapping so that no material can leak out, and to keep it plugged until the tap hole is opened for next tapping. It is applied to ensure periodical and stable tapping from the blast furnace and also to protect the inner surface of tap hole bricks. Its functions are (i) to enable smooth operation of the tap hole, (ii) to maintain constant tap hole length,  (iii) to control the liquid flow out of the blast furnace, and (iv) to ensure separation of hot metal and slag. Blast furnace tap hole mass is normally developed and designed to suit the operating parameters of the blast furnace and to maintain stable tapping time and tap hole depth even under severe operational conditions with high productivity coefficients (ton/cu m/day) or high hot metal temperatures. Requirements of blast furnace tap hole mass Typical requirements from the blast furnace tap hole mass include the following. It should be soft and plastic (workable) enough to inject when pushed by mud gun, but ‘hard’ enough to effectively displace tapping liquid and to deliver a substantial quantity of tap hole mass only to plug to the required depth in the tapping channel. It should be curing to the required strength (often described as sinterability) and without shrinkage to ensure a tight seal within the tap hole (not prematurely in the mud gun), in the required mud gun dwell time and plug to next tap time. It should effect safe tap hole closure (i.e., without subsequently self opening) and without tap hole and...