The difference between dense high alumina bricks and ordinary high-alumina bricks is that they have low pores, are more dense, have a longer service life, and are more resistant to corrosion.
1. Difference in production process
The production process of dense high-alumina bricks is different from that of ordinary high-alumina bricks. In the production process of ordinary high-alumina bricks and dense high-alumina bricks, the production processes of picking, crushing, mixing, molding, and drying are the same, but the process ratio is different. Dense high-alumina bricks need to add a certain proportion of pyroxene or kyanite than ordinary refractory bricks.
Kyanite has a high expansion coefficient. In the process ratio of adding high-alumina bricks, the size of the particles is very important. The expansion coefficient of particles larger than 3mm is difficult to control. Generally, the particles should be controlled when controlling the amount of addition. When adding pyroxene, the impurity content of pyroxene is also controlled. Otherwise, the surface of the refractory brick is rough or the size is difficult to control.
2. The difference between dense bricks and ordinary high alumina bricks and their surfaces
Dense bricks and ordinary high-alumina bricks and their surfaces are also different. Ordinary high-alumina bricks are yellow-white in color, while dense high-alumina bricks are slightly reddish in color. This is because the color of the sintered bricks after adding coke gemstones is different, but the porosity is low. High-alumina bricks have beautiful colors, but their porosity is relatively high.
3. The difference in the price of dense bricks and high-alumina bricks
The prices of dense bricks and high-alumina bricks are also different. Ordinary bricks are relatively cheaper than dense bricks by hundreds or thousands of yuan, because the added matrix and sintering temperature are different, which increases the cost. Generally, high-alumina bricks do not expand much when fired. When controlling dense bricks, the firing temperature is relatively high.
High-alumina bricks are not as good as dense high-alumina bricks in terms of corrosion resistance. Dense bricks have low pores, and their acid corrosion resistance is one to two times higher than ordinary high-alumina bricks, and their service life is one to two times higher than ordinary high-alumina bricks.
Therefore, there is a difference between dense high alumina bricks and ordinary high refractory alumina bricks, both of which are produced on demand according to different conditions of kiln linings. In terms of usage, the usage of high-alumina bricks will be more than that of dense bricks. Dense bricks belong to the high-end materials of the high-alumina series, and high aluminum bricks are divided into different grades according to aluminum content and volume density, while dense bricks are divided into different grades according to the height of pores.
