Practice of China 's Refractory Products in Kiln
Posted by adela li on March 22nd, 2017
HDZS-65 only high porosity standard, corrosion resistance slightly lower than similar foreign products, while other indicators Silicon Carbide are even better than the level of foreign. In addition to imports, in addition to the requirements of high resistance to erosion of glass parts of the glass parts need to use imported products, such as brick and brick wall brick brick, hook can be replaced by domestic materials. tundish lining Leakage brick due to the special use of the environment, on the basis of resistance to erosion should also have a good anti-acute and hot, requiring bulk density 3.95g / cm3, significant porosity <17%, compressive strength> 70N / mm2, Load softening point 1700Ta ℃, alumina carbon nozzle manufacturers thermal shock frequency> 20 times. HDZS-69 indicators have reached the requirements of brick tiles, has been in a domestic alkali-free glass kiln kiln trial effect is good. It is reported that the current domestic construction of several new alkali-free glass fiber kiln will choose HDZS-69 as a leak brick, instead of imported products.
Standard Zirconium Brick (Pressurized Forming) Standard Zirconium Brick is generally used in contact with the furnace flame space and as a dense zircon brick backing brick, requiring a strong resistance to erosion and a high load softening point. The physical and chemical indexes of foreign products are: ZrO265%, SiO234%, Fe3O2 <0.1%, ceramic fiber paper bulk density 3.85g / cm3, apparent porosity ≤10%, mouldable refractory materials room temperature compressive strength> 110N / mm2, load softening point> 1700 ℃ The The indicators and foreign similar products have been basically the same indicators in the kiln observation hole, chest wall, feeding mouth brick, channel burner brick, cover tile, ceramic fiber board dense zircon brick backing and other parts of the brick can replace imported products.
The top of the arch and the edge of the foot brick requirements creep resistance, thermal shock resistance is more stringent, in this part should use Al2O375%, Fe3O2 ≤ 0.3%, SiO2 24% of the re-sintered fused mullite brick, alumina magnesia porosity remained at 13% Below, corundum, mullite phase distribution evenly. In recent years, the domestic refractory plant according to E-glass fiber pool kiln special requirements, in the original product on the basis of continuous improvement, respectively, have their own alternative to imported products, and has been successfully applied in the pool kiln. Other parts of the furnace with mullite brick than the requirements of relatively low brick, domestic refractory materials have been able to meet the requirements.
