When firing Class I and II high alumina bricks in a reverse flame kiln, the general firing temperature is 1430-1450 ℃ and the insulation time is 40 hours. When firing Class I high alumina bricks, the firing temperature is 1390-1400 ℃ and the insulation time is 24-32 hours. If using a tunnel kiln to fire Class I and II high alumina bricks, the firing temperature is usually 1550-1560 ℃.
The heating rate varies with different raw materials and products. During the low temperature stage before 600 ℃, the temperature should be slowly increased; The heating rate can be slightly faster between 600 and 1200 ℃; The heating rate should be controlled for high fever from 1200 ℃ to * *. The cooling stage should also control the cooling rate.
High alumina brick blanks are generally loaded into kilns (or kiln trucks) using flat loading. To avoid black spots during firing, side mounting can also be used. To burn it in a reverse flame kiln, high alumina bricks need to be used to build a frame. If fired in a tunnel kiln, the kiln platform can be leveled with high alumina clinker sand, and a layer of rice husk can be laid between each layer of bricks. To make the brick stack stable, a layer of bricks should be laid flat at a certain height. The height of brick installation is generally 650-1000mm. For Class I high alumina bricks, the height of brick installation may be higher, while for Class I and II bricks, it may be lower.
Contact me:Email:wp@cnjingganrefractory.com/sdwenping@163.com
TEL: 86-0533-4188518 / FAX: 86-0533-4188518
Rose:+86-13275332819(wechat/whatsapp number)
