Coal asphalt manufacturer Shen Huanhuan Introduction to the ash content of coal asphalt.
Coal pitch is a by-product produced in the process of coal tar processing, which is mainly used in the production of coatings, electrodes, asphalt coke, linoleum, etc., and can also be used as a raw material for fuel and asphalt carbon black. The ash content in coal pitch has an important impact on its quality and use. This article will give a brief introduction to the ash content of coal pitch.
1. The ash content in coal asphalt.
The ash in coal pitch is mainly based on various minerals produced by coal in the process of high-temperature dry distillation, which form silicates, sulfates and other compounds at high temperatures, and are mixed into coal tar to form ash after melting. In addition, coal pitch may also be polluted by the outside during transportation, storage and use, such as mixing with soil, sand and other impurities, which form ash at high temperatures.
2. The composition of ash in coal asphalt.
The ash in coal pitch is mainly composed of silicate, sulfate, carbonate and other compounds, of which silicate is the main component. These compounds do not decompose easily at high temperatures, so they cannot be removed by chemical reaction during coal pitch processing and use.
3. The influence of ash in coal pitch.
1.Quality Impact: The ash content in coal pitch has an important impact on its quality. Excessive ash content will lead to the increase of viscosity of coal pitch, the deterioration of fluidity and stability, and affect its processing and use performance. At the same time, impurities in the ash may also adversely affect the performance of the electrodes, carbon black, and other products produced.
2.Environmental impact: The ash in coal asphalt may produce harmful gases and solid particulate matter during high-temperature combustion, causing pollution to the environment. Therefore, when using coal pitch as fuel, corresponding environmental protection measures should be taken to reduce the negative impact on the environment.
Fourth, the method of reducing the ash content in coal asphalt.
1.Raw material control: The use of low-ash feedstocks, such as low-ash coal or washed coal, can reduce the ash content in coal pitch.
2.Optimize the process: By optimizing the high-temperature dry distillation process parameters, such as controlling the heating rate, final temperature, pressure, etc., the ash content in the coal pitch can be effectively reduced. At the same time, strengthen the quality control in the process of transportation, storage and use to avoid the mixing of external impurities.
3.Deashing treatment: The deashing treatment of coal asphalt by physical or chemical methods can effectively reduce its ash content. Physical deashing methods include filtration, sedimentation, etc.;Chemical deashing methods include acid-base treatment, solvent extraction, etc. These methods can reduce the ash content in coal asphalt to a certain extent and improve its quality.
V. Conclusions. To sum up, the ash in coal pitch is mainly due to minerals and external impurities produced in the process of high-temperature dry distillation of coal. These compounds do not decompose easily at high temperatures, which affects the quality and processing performance of coal pitch. In order to reduce the ash content in coal asphalt, methods such as optimization of raw materials and process parameters, physical or chemical deashing can be employed. In actual production, the appropriate method of reducing ash content should be selected according to the specific situation to improve the quality and environmental performance of coal asphalt. At the same time, strengthening the quality control in the production and use of coal asphalt to avoid excessive waste and pollution sources will help achieve the goals of sustainable development and environmental protection.