1. AZS and High Zirconia Bricks
The fused AZS brick is mainly used to improve its erosion resistance and wear resistance. In addition to the oxidation method, the carbon content of the refractory product is reduced to 0.005%, and the glass phase precipitation temperature is increased to 1450 ℃. The casting and annealing processes have also been improved. The fused AZS firebricks with small or no shrinkage cavities and zirconia bricks with a ZrO2 content of more than 90% have excellent thermal shock resistance, such as ZrO2 95. %, SiO2 1.4%. Stabilizer 3.7% of high zirconia bricks, bulk density 4.7 g / cm3, porosity of 18.4%, thermal shock resistance from room temperature to 1400℃ (15 minutes interval) up to 15 to 20 times. Japan has produced a fused-zirconia brick with a zirconia content of 90%, which is called ZFC brick. Its corrosion resistance is better than AZS brick with 40% ZrO2 content. At 1500~1600 °C, no glass phase precipitates after 16 hours. The pollution to the glass is very small, and there is no crack after 40 times of thermal shock resistance test at 800~1250 °C.
2. Chrome Refractory Bricks
The compact chromia bricks formed by isostatic pressing are used for the side walls, necks or other severely eroded parts of E glass and C glass kiln, and the service long life can reach 6 to 7 years. In recent years, new progress has been made in chromium-containing products. For example, Cr2O3 is added to AZS brick to form Al2O3-ZrO2-SiO2-Cr2O3 refractory. At high temperature, Cr2O3 forms a solid solution with Al2O3 on the one hand, and Cr2O3 on the other hand. The high melting point refractory material increases the viscosity of the glass phase in the glass phase of the refractory brick, thereby increasing the bleeding temperature of the glass phase and greatly improving the glass erosion resistance of the glass product. A US company produces a recombination-molded AZS/Cr2O3 refractory material with superior chemical composition and physical properties. Compared with the original Al2O3/Cr2O3 material, the annual electricity consumption is reduced by 4% and the output is increased by 15%. The cost is reduced by 3.75%, and the quality of the glass is not affected. The brick can be formed by mechanical forming, manual beating or isostatic pressing, and then sintered at a high temperature.
3.
Alkaline Refractory Bricks
High-purity direct-bonded alkaline bricks fired at 1800℃ are widely used in regenerator walls and concrete. Germany has introduced a new material under the trade name RUBINAIEZ, which has a chemical composition of MgO 75%, ZrO2 13.5%, and SiO2 9.5%. It is a cristobalite firebrick combined with zircon. In the initial stage of sintering, the zirconium silicate in the brick structure reacts with magnesium oxide to form a protective layer of forsterite and zirconia around the pericdrite particles. The alkali resistance and sulfate resistance of the brick are greatly improved, and the brick in the middle of the regenerator is effective.
4.Magnesia Alumina Brick for Glass kiln
Magnesia aluminum brick is a spinel-type alkaline refractory material containing about 85% MgO. The replacement of magnesia chrome refractory bricks in glass furnace regenerators as lattices has good corrosion resistance.
