Product detail
Silicon carbide bricks for cement kiln
Product Introduction
Silicon carbide bricks for cement kilns are made of high-hardness and high-wear-resistant silicon carbide (SiC) as the key raw material through a specific process. According to different bonding methods, other auxiliary raw materials will be added. For example, clay-bonded silicon carbide bricks will add an appropriate amount of clay to enhance the bonding strength of the brick body; silicon nitride-bonded bricks will introduce silicon powder to form silicon nitride (Si₃N₄) during high-temperature firing, thereby giving the brick body unique properties; recrystallized silicon carbide bricks rely on the recrystallization of silicon carbide itself at high temperatures to achieve densification and performance improvement.
This brick has a series of excellent properties. It has excellent wear resistance and can effectively resist the erosion and wear of cement materials during the flow of cement in the kiln, greatly extending the service life of the kiln lining. It has good corrosion resistance and has strong resistance to various chemical substances produced in the cement production process, such as alkaline compounds, ensuring the stability of the brick structure. Its high-temperature strength is high. Even in the high-temperature environment of the cement kiln, it can still withstand the mechanical stress caused by kiln rotation and material filling, and maintain the integrity of the kiln lining. It has good thermal shock stability and can adapt to the frequent temperature changes in cement kilns during the production process, effectively avoiding cracking and peeling of bricks caused by thermal stress. In addition, it has a high thermal conductivity, which is helpful for the transfer and uniform distribution of heat in the kiln. At the same time, the thermal expansion coefficient is small, which reduces the volume change of bricks caused by temperature changes, and further enhances its stability in use.
Application
Silicon carbide bricks for cement kilns play a vital role in the cement production process and are mainly used in multiple key parts of cement rotary kilns. In the lining brick part of the discharging kiln, due to the direct scouring and wear of high-temperature clinker, the high wear resistance of silicon carbide bricks can ensure the long-term stable operation of the kiln lining here, effectively reducing the number of shutdowns and maintenance caused by lining wear, and improving production efficiency. In the cooling zone, the good thermal conductivity of the brick body helps the rapid cooling of the clinker, meeting the requirements of the cement production process for the cooling speed of the clinker. At the same time, its high temperature resistance and corrosion resistance ensure normal use in the complex environment of the cooling zone. In the transition zone, the brick can adapt to changes in temperature and atmosphere, provide reliable lining protection for the kiln body, and ensure a stable calcination environment for cement clinker during the transition from the burning zone to the cooling zone, which is of great significance for improving the quality and output of cement clinker.
Product Parameters
| Items | Oxide bonded SIC brick | Corundum-SIC brick | Mullite-SIC brick | Alumina-SIC brick | Si3N4-SIC brick |
| SiC % | ≥85 | ≥70 | ≥65 | ≥20 | ≥72 |
| Al2O3 % | — | ≥20 | ≥20 | ≥55 | — |
| Si3N4 % | — | — | — | — | ≥19 |
| Bulk density (g/cm3) | ≥2.5 | ≥2.6 | ≥2.3 | ≥2.5 | ≥2.65-2.7 |
| Apparent porosity % | ≤18 | ≤20 | ≤20 | ≤22 | ≤14-18 |
| Cold compression strength (Mpa) | ≥100 | ≥100 | ≥80 | ≥80 | ≥200 |
| Refractoriness under load (0.2Mpa,0.6%) | ≥1700 | ≥1700 | ≥1650 | ≥1550 | ≥1600 |
| Thermal Conductivity W/(m.k) 1200℃ | 13.2 | 6-8 | 12 | 6-8 | 16 |
| Thermal shock resistance Water quenching at 1100℃ (time) | ≥40 | ≥30 | ≥40 | ≥30 | ≥30 |
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