1. Introduction to high alumina bricks
High alumina brick is a kind of refractory material, the main component of this refractory brick is Al2O3.
If Al2O3 content is higher than 90%, it is called corundum brick. Due to different resources, national standards are not completely consistent.
2. The production process of high alumina bricks
The production process of high alumina bricks and multi-clinker clay bricks are similar. The difference is that the proportion of clinker in the ingredients is higher, which can be as high as 90-95%. The clinker needs to be sorted and sieved to remove iron before crushing, and the firing temperature Higher, such as Ⅰ, Ⅱ high alumina bricks are generally 1500～1600℃ when they are fired in a tunnel kiln.
Production practice in China has proved that before crushing, high-aluminum clinker is strictly sorted and classified, and stored in tiers. The use of bauxite clinker and combined clay fine grinding method can improve product quality.
3. Raw materials for high alumina bricks
According to different resource conditions and product requirements, the following types of raw materials can be used: high alumina bauxite mainly composed of hydrated bauxite minerals (monohydrate, gibbsite, etc.); sillimanite group minerals (including kyanite) Stone, andalusite, sillimanite, etc.); synthetic raw materials, such as industrial alumina, synthetic mullite, fused corundum, etc. China is rich in resources of high-alumina vanadium, with good quality, and its production areas are mainly distributed in Shanxi, Henan, Hebei, Guizhou, Shandong and other places. The high alumina bauxite produced is mainly a mixture of two minerals: monohydrate (α-Al2O3·H2O) and kaolinite.
