Calcination process and advantages of brown fused alumina

Brown fused alumina is known as the “teeth of industry”. However, high temperature calcined brown fused alumina is made from medium and high temperature calcined abrasives in the high calcined production process of original abrasives, then formed at high temperature. The following is the calcination process and advantages of brown fused alumina.

1. Calcination Method

There are shuttle kiln, tunnel kiln, rotary kiln and inverted smoke kiln (has been eliminated) and vertical kiln. Heat source is mainly coal, gas, liquefied gas, methane gas and electricity.

2、Calcination Process

Put the brown fused alumina into a container and preheat it first, then gradually heat it up to 800-1350 ℃ and calcine it for 2-4 hours. After natural cooling, wash and sieve it. The abrasive shows dark brown, brown blue, blue, light blue, and blue gray according to different temperatures.

3. The advantages of calcined brown fused alumina

Eliminated abnormal expansion of brown fused alumina . Due to the presence of low valence titanium oxide (Ti2O3, TiO), titanium carbide, and titanium nitride (TiC, TiN) in the abrasive during the smelting process of fused alumina, they will further oxidize and increase in volume when calcined at 800 ℃-1350 ℃, causing the volume change of the abrasive to exceed its normal expansion, which called abnormal expansion.

Abnormal expansion of abrasives may cause network cracks on the surface of brown fused alumina ceramic abrasive wheels during firing, resulting in a large amount of waste. However, calcination is an effective way to eliminate abnormal expansion of brown fused alumina.