High alumina brick and Mullite brick Is it the same? Of course, although the main components of these two kinds of refractory bricks are alumina, there are many differences between them, such as crystal phase, price and usage effect of high alumina brick and mullite brick.
Mullite brick is a kind of high alumina refractories. It is a silicon aluminum refractory product with mullite as the main crystalline phase. Its alumina content is between 60%-75%. According to the production process, it is divided into sintered mullite brick and electric melting mullite brick.
High alumina brick is a high alumina refractory brick with a three oxidation and two aluminum content of over 48%. Using high bauxite clinker as the main raw material, soft clay and waste paper pulp as binding agent, the mixture of multi-stage particles is made of high pressure molding, drying and high temperature firing. High alumina bricks are classified according to mineral composition: low mullite, mullite, mullite corundum, corundum mullite and corundum. Their mineral compositions are mainly corundum, mullite and glass phase.
Mullite brick There are light stone bricks and heavy bricks, and the main crystalline phase of mineral composition is mullite. The production technology of sintered mullite products such as light mullite bricks is similar to that of high alumina products. Using synthetic mullite clinker as pellet, fine powder as mullite clinker, or white corundum and quartz powder with pure clay, the mixture is made of mullite.
The high alumina brick is divided into four grades according to the aluminum content, the aluminum content of the three grade high alumina brick is not less than fifty-five percent, the aluminum content of the two grade high alumina brick is not less than 65, the content of the high alumina brick is not less than 75, and the aluminum content of the super high alumina brick is above 85. As for the shape of high alumina bricks, in addition to the standard high alumina brick, and the general type of high alumina brick, also known as the special-shaped high alumina brick, if the shape is very irregular, it is usually called the special high alumina brick, in short, according to the specific use of the kiln.
High alumina brick and Mullite brick Is it the same? Both of them belong to high alumina refractory products, which are different refractory products. We need to pay attention to these problems when choosing firebricks.