85% high alumina brick is a neutral refractory material with an alumina content of around 85%. Made from raw materials with high alumina content, such as bauxite, through molding and calcination. High thermal stability, with a fire resistance of over 1770 ℃. 85% high alumina bricks are also divided into universal high alumina bricks (i.e. T-shaped bricks), special-shaped high alumina bricks, and blast furnace bricks (i.e. G-shaped bricks).
According to different resource conditions and product requirements, 85% high alumina bricks can use the following types of raw materials: high alumina bauxite mainly composed of hydrated alumina minerals (such as monohydrate alumina, trihydrate alumina, etc.); Silurite group minerals (including kyanite, rhodochrosite, sillimanite, etc.); Artificially synthesized raw materials, such as industrial alumina, synthetic mullite, fused alumina, etc. China has abundant high alumina vanadium soil resources with good texture, mainly distributed in Shanxi, Henan, Hebei, Guizhou, Shandong and other places. The high alumina vanadium soil produced is mainly a mixture of two minerals, namely boehmite (α - Al2O3 · H2O) and kaolinite.
The main reason for the appearance of non color in high alumina bricks is due to the high temperature of the original atmosphere, which restores the color of iron and titanium ions. At lower temperatures, low iron and titanium ions undergo de novo oxidation and decolorization.
In addition, the high alumina bricks are located too close to the fire box in the kiln, resulting in the formation of oxygen rich operations due to the high temperature of the hot air, which prevents the restoration of the atmosphere; During the cooling process, slow cooling is used to de oxidize and decolorize the cheap iron and titanium ions.
According to the difference in the content of Al2O3, high alumina bricks are commonly used with contents of 48%, 55%, 60%, 65%, 73%, 75%, 85%, and of course, those with higher contents are classified as corundum.
Contact me:Email:wp@cnjingganrefractory.com/sdwenping@163.com
TEL: 86-0533-4188518 / FAX: 86-0533-4188518
Rose:+86-13275332819(wechat/whatsapp number)
