- Time:Aug 22, 2023
Calcination of refractory raw materials is to achieve the following purposes:
1. Structural stability: At high temperatures, refractory materials need to have good structural stability to resist mechanical effects such as thermal expansion, contraction and thermal stress. The calcination process can make the particles in the refractory raw materials more tightly bonded, forming a strong structure, and improving the strength and stability of the refractory material.
2. Ensure chemical purity: Some refractory raw materials may contain impurities or volatiles, such as moisture, organic matter, sulfur, etc. Calcination can remove these impurities through high temperature treatment, improving the purity and stability of refractory materials.
3. Improve refractory performance: During the calcination process, some components in refractory materials may undergo crystalline phase transition or liquid phase formation, thereby changing the crystal structure and chemical properties of the material. This can improve the corrosion resistance, wear resistance, high temperature resistance and other specific properties of refractories, making them more suitable for applications in high temperature environments.
1. Adjusting material properties: By controlling parameters such as temperature, time, and atmosphere during the calcination process, the microstructure, crystal size, and chemical composition of refractory materials can be adjusted to meet specific application requirements. For example, calcination can make certain materials denser and more uniform, or change their thermal conductivity.
1. Reduce the water absorption of materials: For some refractory materials, controlling the calcination conditions can make them have lower water absorption, so as to avoid the material from absorbing water to swell or being damaged by moisture in a humid environment.
In short, the calcination of refractory raw materials realizes the densification, purification and performance adjustment of materials by controlling factors such as temperature, time and atmosphere, so as to improve the structural stability, refractory performance and ability to adapt to specific industrial applications of refractory materials.
