Coal asphalt manufacturer Shen Min
Coal pitch is an important chemical material that is widely used in many fields. It has unique properties and diverse uses. What indicators does the best bad coal pitch depend on?Its quality directly affects the use effect. Then, we will introduce how to identify the quality of coal pitch from the aspects of visual inspection, softening point, volatile matter, residual benzene content, quinoline insoluble, ash, moisture, and penetration.
1. Visual inspection.
High-quality coal pitch should be a dark brown or black gelatinous solid with obvious viscosity. If the coal pitch is too light in color or too thin, it may be of poor quality.
2. Softening point.
The softening point is one of the important indicators of coal asphalt. In a high-temperature environment, high-quality coal pitch should maintain a certain elasticity and will not be easily softened or melted. If the softening point is too low, the coal pitch is easy to deform at high temperatures, which affects the use effect.
3. Volatile matter.
Volatile matter refers to the synthesis of gases and liquids released by coal pitch during the heating process. High volatile content indicates that coal pitch contains more light components, which is easy to burn incompletely, resulting in black smoke and peculiar smell. Therefore, the lower the volatile content, the better the quality of the coal pitch.
4. Residual benzene content.
Residual benzene refers to the unvolatile benzene substances in coal pitch. Benzene is a toxic substance that is harmful to the human body, therefore, the lower the residual benzene content, the better the quality of the coal pitch.
5. Quinoline insoluble.
Quinoline insoluble matter refers to the substances in coal pitch that cannot be dissolved by quinoline solution, and these substances will affect the cohesiveness and stability of coal pitch. Therefore, the lower the quinoline insolubluble, the better the quality of the coal pitch.
6. Ash. Ash refers to the white substance left after the high temperature combustion of coal asphalt, and the high ash content indicates that the coal pitch contains more white substances. High ash content indicates that coal pitch contains more inorganic impurities.
7. Detection of water content: the water content of high-quality coal pitch is low, generally less than 1%, and it is not easy to deteriorate due to moisture. However, inferior coal asphalt has a high water content and is easy to deteriorate due to moisture.
From the above comprehensive test results, we can comprehensively evaluate the best quality of coal asphalt. The quality requirements for coal asphalt vary depending on the use, so it needs to be tested and evaluated according to the specific requirements in practical applications.