Coal asphalt bonding index is a product formed by pyrolysis, volatilization and thermal condensation reaction of coal under certain conditions, and is an important industrial raw material. Its adhesion index is one of the important indicators to measure the quality of coal asphalt, which is of great significance for guiding production, scientific research and quality control.
The adhesion index of coal pitch is determined according to the national standard GB T 8774-2007 "Method for Determination of Cohesion Index of Coal Asphalt". This standard specifies the method for determining the adhesion index of coal asphalt, including steps such as preparation before the test, sample preparation, test procedure and result calculation.
In the determination of coal pitch adhesion index, it is necessary to prepare the coal asphalt sample into a certain fineness of granularity and heat treatment at a certain temperature. The heat-treated specimen is then tested on a dedicated adhesion index testing machine, and the adhesion index is calculated by measuring the weight change of the specimen over different times.
According to the national standard, the results of the determination of the adhesion index of coal asphalt are expressed as the average of 10 samples. If the extreme difference of the measurement results of 10 samples does not exceed 20% of the mean value, the average value is used as the measurement result;If the range exceeds 20% of the average, it needs to be re-measured.
In actual production, the size of the coal pitch adhesion index depends on factors such as the type of coal, pyrolysis conditions and processing technology. Generally speaking, the higher the coal asphalt bond index, the better its quality and the more versatile it is. For example, coal pitch with a high adhesion index can be used to produce high value-added products such as needle coke, bitumen fibers and various types of carbon black, while coal pitch with a low adhesion index can be used to produce general carbon materials such as electrode paste and anode paste.
The determination of coal asphalt adhesion index is of great significance for coal processing enterprises and carbon material manufacturers. By understanding the size of the coal pitch adhesion index and its influencing factors, you can better control the production process, improve product quality and reduce costs. At the same time, for scientific research institutions and laboratories, the determination of coal asphalt adhesion index is also one of the important means to carry out related research.
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