Coal asphalt manufacturer Zhang Yu
Asphalt production process.
I. Introduction. Asphalt is a commonly used road material, which is widely used in the construction of highways, airport runways, parking lots, etc. The asphalt production process refers to the process of passing petroleum raw materials through a series of processing processes to finally produce asphalt products. This article will introduce the main steps and key technologies of the asphalt production process.
2. Preparation of raw materials.
The main raw material for bitumen is petroleum. The petroleum undergoes a fractional distillation process to obtain heavy oil, and then undergoes heating cracking, polymerization and other treatments to obtain asphalt. In the process of raw material preparation, it is necessary to send the petroleum raw material to the heating equipment, and separate the asphalt from the petroleum through heating and separation.
3. Asphalt production.
1.Refining process.
Impurities and heavy oil are removed from the raw materials. First, the impurities are removed through distillation, solvent extraction and other processes, and then the heavy oil is separated through heating, evaporation, condensation and other operations. The purpose of this step is to improve the quality and purity of the asphalt.
2.Modification process.
The refined asphalt is modified to improve its properties. Modification can be carried out by adding modifiers, physical treatment, etc. Common modifiers are rubber powder, polymer, asphalt emulsion, etc. Modification can improve the strength, aging resistance and water resistance of asphalt.
3.Mixing process.
The modified asphalt is mixed with aggregate to obtain an asphalt mixture. The aggregate can be stone, sand, etc., which is used to increase the strength and stability of the asphalt mixture. During the mixing process, parameters such as mixing time and temperature need to be controlled to ensure the quality of the mixture.
4.Storage and transportation.
The finished asphalt products are stored and transported. Bitumen usually leaves the factory in block or liquid form, which requires operations such as packing, loading, etc. Bitumen should be stored in airtight containers to prevent oxidation and contamination. During transportation, care needs to be taken to maintain the temperature of the asphalt to maintain its fluidity.
Fourth, key technologies.
1.Distillation technology.
Distillation is a critical step in separating the bitumen from the raw material. By controlling the boiling point at different temperatures, the bitumen in the oil is separated. The key to distillation technology is to control temperature and pressure to ensure separation results and product quality.
2.Modification technology.
Modification is one of the key technologies to improve the performance of asphalt. Commonly used modification technologies include physical modification and chemical modification. Physical modification can be carried out by adding modifiers, mixing at high temperatures, etc. Chemical modification can be carried out by polymerization reaction, cross-linking reaction, etc. Choosing the right modification technology can improve the stability, aging resistance and water resistance of asphalt.
3.Hybrid technology.
Mixing is a critical step in homogeneous mixing of asphalt and aggregates. The key to mixing technology is to control the mixing time, temperature and ratio to ensure that the asphalt and aggregate are fully in contact and mixed. Reasonable mixing technology can improve the strength and stability of asphalt mixture.