High Alumina Brick for Blast Furnace
High alumina brick is an important lining material for blast furnace. It has the characteristics of high temperature resistance, wear resistance, erosion resistance and good thermal shock resistance. It has a wide range of applications in iron and steel enterprises, non-ferrous metal smelting and chemical engineering.
High alumina brick is mainly used for the preheating zone, working layer, transitional area, cooling zone and so on of blast furnaces. High alumina brick is characterized by high alumina content and high refractoriness. Generally, the product can be divided into four types: clay brick, light weight brick, fire clay brick, and mullite brick.
The clay brick is made from clay by sintering and has a refractoriness of 1580-1600℃. Fire clay brick is made from mudstone or fireclay by sintering, Its refractoriness is generally medium and its thermal shock resistance is good. The light weight brick is made of clay, bauxite and other light raw materials, and its refractoriness is generally lower than clay brick. The mullite brick is made of high alumina raw material and clay, and has the characteristics of high refractoriness and high thermal shock resistance.
Compared with other refractories, the high alumina brick has good thermal shock resistance, strong erosion resistance and wear resistance. It can reduce the erosion of molten metal and slag on the furnace wall and prevent the combustion from entering the furnace wall. High alumina brick also has certain catalytic properties and can catalyze the oxidation of carbon monoxide.
High alumina brick has a wide variety of selection. In order to make the high alumina brick have better performance, the steel plant needs to select the high alumina bricks from many brands. This kind of high alumina brick is required to have a certain number of characteristics such as high temperature resistance, wear resistance, erosion resistance, and good thermal shock resistance.
When selecting high alumina bricks, one should first determine the number of key performance requirements such as the refractoriness and the thermal shock resistance of the refractory according to the actual situation of the furnace. Then, the service life, wear and abrasion loss and the erosion resistance of the refractory should be taken into consideration, and the selection of the material and brand should be based on the comparison of the actual performance data of the materials.
Finally, it is very important to check the quality of the refractory materials before being installed. All the high alumina bricks used in the blast furnace should be inspected on the measuring surface, with special attention to size, appearance, texture, thermal and mechanical properties. Moreover, a full inspection and testing must be done before installation of the high alumina bricks.
In summary, high alumina brick has a wide range of applications in the steel and non-ferrous metal smelting industries and the chemical engineering industry. When selecting this kind of material, it is necessary to pay attention to the refractoriness, thermal shock resistance, erosion resistance and wear resistance of the product, as well as the overall performance before installation. By ensuring the correct selection and installation of the material, it can not only save cost but also improve the service life of the blast furnace.
