1. Overview.
Coal pitch and modified asphalt are commonly used binders in the production of magnesia carbon bricks, and they play a vital role in the production process of magnesia carbon bricks. However, in practical application, the selection and use of coal asphalt and modified asphalt need to pay attention to some issues. This article will discuss the selection, use and precautions of coal asphalt and modified asphalt in the application of magnesia carbon bricks.
2. Characteristics of coal asphalt and modified asphalt.
Coal pitch is obtained by high-temperature distillation and processing of coal tar, which has a complex composition and contains a variety of polycyclic aromatic hydrocarbons and heterocyclic compounds. Coal pitch has high bond strength and refractoriness, and is a common binder in the production of magnesia carbon bricks. However, coal pitch is volatile and produces harmful gases when heated, so it is necessary to pay attention to safety issues during use.
Modified asphalt is chemically modified to improve its properties. The modified asphalt has low volatility and good high temperature resistance, which can further improve the high temperature performance and service life of magnesia carbon bricks. However, the cost of modified asphalt is high, and it needs to be reasonably selected in production.
3. Application of coal asphalt and modified asphalt in magnesia carbon bricks.
In the production of magnesia carbon bricks, the main role of coal pitch and modified asphalt as binders is to bond various raw materials together to form refractories with excellent properties. Their mechanism of action is mainly softening or melting at high temperatures, infiltrating and bonding various raw materials together to form a whole with a complex structure.
In practical application, the selection of coal asphalt and modified asphalt should be carried out according to the performance requirements and use conditions of magnesia carbon bricks. Generally speaking, for some occasions where the requirements are not too high, you can choose to use coal pitch as a binder; For some occasions with high temperature, high pressure or long service life, modified asphalt should be used as a binder.
In the process of using coal pitch and modified asphalt, attention should be paid to controlling the heating temperature and heating time to avoid overheating or insufficient heating. At the same time, it is also necessary to pay attention to the mixing uniformity and the amount of addition to ensure the quality and performance of magnesia carbon bricks. In addition, it is also necessary to pay attention to safety issues during use, such as wearing protective glasses, gloves and other personal protective measures.
IV. Conclusions. Coal asphalt and modified asphalt play an important role in the production of magnesia carbon bricks, and their selection and use directly affect the performance and quality of magnesia carbon bricks. In practical applications, it is necessary to select according to specific requirements and use conditions, and pay attention to controlling parameters such as heating temperature, heating time, mixing uniformity and addition amount. At the same time, it is also necessary to pay attention to safety issues and take corresponding protective measures. In the future, with the continuous progress of technology and the continuous improvement of application demand, the application of coal asphalt and modified asphalt in magnesia carbon bricks will be more extensive and deeper. Therefore, it is necessary to continuously strengthen research and technological innovation to improve the performance and service life of magnesia carbon bricks and meet the needs of different fields.