Furnace drying time after pouring of refractory castables

After the refractory castable is poured, it needs to go through a period of hardening and curing before the furnace can be baked. Usually, the refractory castable needs 24 hours of hardening before demoulding, followed by natural curing for about 3 days. This period of time helps the castable to fully harden and avoid falling off or bursting due to insufficient hardening during the furnace baking process.

The relationship between construction quality and service life

The pouring quality of refractory castables is directly related to the use effect and service life of the furnace. Therefore, before production, this process must be carried out strictly in accordance with regulations and requires sufficient time. In addition to natural solidification, a lot of time is required for furnace baking. Strictly following the furnace baking procedure can not only ensure the quality of refractory castables, but also ensure the stable operation of the kiln after production.

Importance of Refractory Castable Furnace

The kiln is very important for refractory castables. Correct kiln baking directly affects the service life of the kiln. If the kiln is not baked properly, it may cause the refractory castables to fall off or the kiln chamber to burst. Therefore, it is necessary to strictly follow the regulations to bake the kiln to avoid these problems.

Take high alumina castable as an example

The baking scheme of high-alumina castables usually includes the following heating stages:

• Room temperature to 150℃
• 150℃ to 300℃
• 300℃ to 600℃
• 600℃ to 800℃
• 800℃ to operating temperature

Each heating stage should be heated slowly at 15℃/h, 15℃/h, 10℃/h, 20℃/h, 30℃/h, and kept warm at 150℃, 300℃, 600℃, 800℃ for 10 hours. The whole baking time is about 110 hours. In addition, the baking curve should be adjusted according to the actual casting thickness.

Construction completion to production start time

It takes about a week from the completion of refractory castable construction to the official start of production. This period includes hardening, natural curing and furnace baking to ensure the quality and safety of the castable. Too much haste to start production may cause the refractory castable to fall off and explode, affecting the production progress and the overall use of the furnace.