In July 25 tons refractory high alumina fire bricks are packed for delivering to customer in Philippines . High quality and best price refractory material products in Topower Refractory.
For high alumina fire bricks, whether they are grade one, grade two or grade three, their color can be yellow, white or normal colors such as yellow or white. Its classification mainly depends on the aluminum content and bulk density.
In the finished high-alumina bricks, uniform color usually indicates that the material is purchased in batches and the temperature is stable. If the color is inconsistent, it may mean that the raw materials are not purchased in batches, or the raw materials have not been weathered, or the sintering temperature is uneven. If the brick is too white, it may not be used, because it may mean that the brick is not burned through, and the refractory brick has not reached the proper physical and chemical indicators, thus affecting its service life.
When discussing the standards of high-alumina bricks, their internal quality cannot be judged solely by the appearance color. The inherent quality of high-alumina bricks mainly depends on their physical and chemical indicators.
The matrix of the raw materials of high-alumina bricks will affect the color of high-alumina bricks. For example, after adding silicon carbide to the refractory brick, the color of the sintered high-alumina brick will turn black. Of course, green silicon carbide can also be added. If it is green silicon carbide, its color is usually the same as the main raw material. In addition, if it is a corundum brick, the raw material is corundum, then the color of the corundum brick is white.
In addition, the sintering temperature will also affect the color of high alumina fire bricks. Only when the temperature of each high alumina brick is uniform, the refractory brick will show a uniform color. Of course, silicon molybdenum bricks can only be produced when fired in a reducing sintering atmosphere. High alumina bricks must be sintered in an oxidizing atmosphere to avoid coloring of high alumina bricks.
If the entire batch of high alumina refractory bricks is the same color, there is no problem with the sintering temperature. But if the entire batch of clay bricks is white, it means that the temperature is low, it is not burned through, and the inherent quality of the clay bricks is not good.
In short, the color and quality of high alumina bricks are related to temperature sintering.
The strength of high alumina bricks varies depending on the grade.
According to the brand name:
The normal temperature and pressure strength of lz-80 is greater than 70MPa.
The strength of lz-75 at room temperature and pressure is greater than 60MPa
The strength of lz-65 at room temperature and pressure is greater than 50MPa
The strength of lz-55 at room temperature and pressure is greater than 45MPa
High alumina fire bricks are mainly made of high alumina bauxite, which contains alumina and silicate minerals such as kyanite, andalusite and sillimanite. In addition, synthetic raw materials such as industrial alumina, synthetic mullite and fused corundum can also be used. In China, aluminum and vanadium resources are abundant and of high quality. But when judging high alumina bricks, we should not only pay attention to their compressive strength, but also pay attention to the standard size of refractory bricks to speed up the construction progress and bring more benefits.
The size of standard bricks is 230×115×65mm, the size of four pieces is 230×115×40mm, the size of three pieces is 230×115×30mm, and the size of mountain bricks is 150×120mm. Among them, the weight of cursor brick 1 is 1.7kg, the weight of heavy clay brick is 3.75kg, the weight of 30 board is 0.79kg, and the weight of 40 board is 1.05kg.
