Modified asphalt deliming processing technology
Through the modified asphalt deaze processing process, including raw material pretreatment, melting reaction and multi-stage filtration, the problem of ash residue in the modified asphalt is solved, significantly improving the uniformity and performance of the product, and improving market competitiveness and service life.
Patent Information
- Application Number
- CN202411958543.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-03-11
AI Technical Summary
During the production process of modified asphalt, the residue of ash affects the purity, physical properties and chemical stability of the product, and thus affects the service life and safety of the road surface.
The modified asphalt deaze processing process is adopted, including raw material pretreatment, melting reaction, multi-stage filtration and ultrasonic treatment, to remove ash through chemical or physical methods to ensure the stability and consistency of product quality.
It significantly improves the uniformity and performance of modified asphalt, reduces the ash content, improves the purity and market competitiveness of the product, and extends the service life.
Smart Images
Figure CN119592337A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of asphalt deashing, and in particular to a modified asphalt deashing processing technology. Background Art
[0002] In carbon production and modern road construction, modified asphalt is often used as a high-performance bonding material. It is widely used due to its excellent physical and chemical properties, such as high temperature stability, low temperature crack resistance, water stability and durability. However, in the production process of modified asphalt, a key technical problem is how to effectively remove the ash in it to improve the purity and quality stability of the product. The presence of ash not only affects the physical properties of modified asphalt, but also may have an adverse effect on its chemical stability, thereby affecting the service life and safety of the road surface. Therefore, it is particularly important to develop an efficient and environmentally friendly deashing process for modified asphalt. Modified asphalt is a new type of pavement material that improves and enhances the performance of asphalt by adding a certain amount of modifiers, such as polymers, rubber powder or thermoplastic elastomers, to the base asphalt through a specific processing process. However, in the production process of modified asphalt, due to various factors in the raw materials, processing equipment and processing, a certain amount of ash often remains in the asphalt. Ash mainly comes from minerals in the raw materials, impurities in the processing process and metal particles generated by equipment wear. The presence of ash has a significant impact on the performance of modified asphalt. First, ash content will reduce the purity of modified asphalt, thereby affecting its physical properties, such as reducing its viscosity and increasing its brittleness. Second, ash content may also act as a catalyst for chemical reactions, accelerating the aging process of asphalt and reducing its service life. In addition, ash content may also affect the color and appearance of modified asphalt, reducing its market competitiveness. Summary of the invention
[0003] The purpose of the present invention is to solve the problems raised by the above-mentioned background technology and to propose a modified asphalt deashing processing technology.
[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A modified asphalt deashing process comprises the following steps: a. Raw material preparation and pretreatment: selecting a base asphalt that meets the quality standards as the main raw material, and selecting a corresponding modifier such as a polymer, rubber powder or thermoplastic elastomer according to the modification requirements, mixing the base asphalt and the modifier in a preset ratio, and then performing pretreatment, including removing impurities and moisture therein, and heating the asphalt and the modifier to a suitable reaction temperature to ensure that the two can be fully fused; b. Melting and reaction stage: sending the pretreated mixture into a melting reactor, melting it under a controlled temperature and pressure environment, so that the asphalt and the modifier are completely mixed and reacted. Biochemical reaction to form modified asphalt; c. Deashing: The modified asphalt is sent to the deashing device and the ash is removed by chemical or physical methods. Specific methods include but are not limited to using acidic solution to dissolve ash, using ultrasound or high-voltage electric field to promote ash separation, or using filtration and centrifugal physical means to directly remove ash particles. The treatment conditions must be precisely controlled during the deashing process; d. Post-treatment and quality control: The modified asphalt after deashing is further treated, such as cooling and homogenization, to ensure the stability and consistency of product quality. At the same time, strict quality inspection methods are used, such as ash content determination, viscosity test and aging test.
[0005] Preferably, in step a, the pretreatment further comprises feeding into a high-speed grinder or shear mixer, and refining the mixture to a particle size of less than 50 μm through high-speed rotating blades or shearing action, to ensure that the two can react more fully in subsequent steps.
[0006] Preferably, the melt reactor in step b is a closed melt reactor with an efficient stirring device to ensure that the asphalt and the modifier are fully mixed at a constant temperature and pressure to avoid oxidation and volatilization losses. The reaction temperature is controlled to be around 180°C and the reaction time is 2 hours to allow the modifier to be fully dispersed and embedded in the asphalt matrix.
[0007] Preferably, the deashing device in step c adopts a multi-stage filtration system, the first stage adopts a 100-mesh filter for coarse filtration to remove larger ash particles; the second stage adopts a microporous membrane or a ceramic filter element with a pore size of 5 μm for fine filtration.
[0008] Preferably, before the modified asphalt is filtered through the microporous membrane, it is also sent to an ultrasonic processor to perform ultrasonic treatment on the asphalt for 30 minutes at 20 kHz and a power of 1000 W.
[0009] Preferably, the post-treatment in step d also includes coloring the modified asphalt to adjust its color to meet specific requirements and improve the aesthetics and market competitiveness of the product.
[0010] Preferably, the entire processing process also includes cleaning and disinfection of production equipment and pipelines to prevent cross contamination and ensure the purity and safety of product quality.
[0011] Preferably, step e, i.e., product storage and transportation, is also included, wherein the modified asphalt that has been deashed and meets quality requirements is stored in a special storage tank, and necessary insulation and protective measures are taken during transportation to maintain the stability of the product and extend its service life.
[0012] Preferably, the method further includes adding antioxidants and stabilizer additives in step b to further improve the durability and stability of the modified asphalt.
[0013] Compared with the prior art, the present invention provides a modified asphalt deashing process, which has the following beneficial effects: 1. The deashing process of the modified asphalt ensures that the asphalt and the modifier can be fully mixed and chemically reacted through fine pretreatment of the raw materials (such as high-speed grinding to less than 50μm) and efficient stirring and constant temperature control in the melt reactor. This not only improves the uniformity of the modified asphalt, but also significantly improves its performance, such as durability and anti-aging. In addition, the addition of antioxidants and stabilizer additives further enhances the stability and service life of the modified asphalt.
[0014] 2. The modified asphalt deashing process can efficiently remove ash from the modified asphalt by using a deashing method that combines a multi-stage filtration system with ultrasonic treatment. This not only reduces the ash content, but also improves the purity and quality stability of the product. The multi-stage filtration system can gradually remove ash particles of different sizes, while ultrasonic treatment can promote the dispersion and separation of ash, further improving the filtration efficiency. These measures together ensure that the ash content of the final product meets the predetermined standards.
[0015] 3. The deashing process of modified asphalt adjusts the color of modified asphalt to meet specific requirements through color adjustment, which improves the aesthetics and market competitiveness of the product. This step not only meets the customer's personalized needs for color, but also improves the overall image and added value of the product. At the same time, the cleaning and disinfection of production equipment and pipelines ensure the purity and safety of product quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The present invention is a schematic diagram of the process flow of a modified asphalt deashing process. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0018] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0019] like Figure 1 As shown, a modified asphalt deashing process proposed in one embodiment of the present invention has the following specific steps: a. Raw material preparation and pretreatment: Select a base asphalt that meets national standards as the main raw material, and select a polymer as a modifier according to the modification requirements. The base asphalt and the polymer are mixed in a ratio of 10:1 and sent to the pretreatment equipment. The pretreatment includes removing impurities and moisture by heating to 150°C, and using a high-speed grinder to refine the mixture to a particle size of less than 50μm to ensure that the two can be fully fused. b. Melting and reaction stage: The pretreated mixture is sent to a closed melting reactor with a high-efficiency stirring device, the reaction temperature is controlled to 180°C, and the reaction time is 2 hours, so that the asphalt and the modifier are completely mixed and chemically reacted to form modified asphalt. At the same time, an appropriate amount of antioxidant is added to improve the durability of the modified asphalt, c. Deashing treatment: The modified asphalt is sent to the deashing device, treated with an acidic solution to dissolve the ash, and the dissolved ash is removed by a filtration system. During the deashing process, the processing conditions are strictly controlled to avoid adverse effects on the main structure of the modified asphalt. d. Post-processing and quality control: The modified asphalt after deashing is cooled and homogenized to ensure the stability and consistency of product quality. Ash content determination, viscosity test and aging test quality inspection methods are used to ensure that the final product meets the predetermined performance standards and customer requirements.
[0020] In the present invention, a modified asphalt deashing process has the following specific steps: a. Raw material preparation and pretreatment: Select a base asphalt that meets national standards as the main raw material, and select a polymer as a modifier according to the modification requirements. The base asphalt and the polymer are mixed in a ratio of 10:1 and sent to the pretreatment equipment. The pretreatment includes removing impurities and moisture by heating to 150°C, and using a high-speed grinder to refine the mixture to a particle size of less than 50μm to ensure that the two can be fully fused. b. Melting and reaction stage: The pretreated mixture is sent to a closed melting reactor with a high-efficiency stirring device, the reaction temperature is controlled to 180°C, and the reaction time is 2 hours, so that the asphalt and the modifier are completely mixed and chemically reacted to form modified asphalt. At the same time, an appropriate amount of antioxidant is added to improve the durability of the modified asphalt, c. Deashing treatment: The modified asphalt is sent to the deashing device, treated with an acidic solution to dissolve the ash, and the dissolved ash is removed by a filtration system. During the deashing process, the treatment conditions are strictly controlled to avoid adverse effects on the main structure of the modified asphalt. d. Post-treatment and quality control: The modified asphalt after deashing is cooled and homogenized to ensure the stability and consistency of product quality. Ash content determination, viscosity test and aging test quality inspection methods are used to ensure that the final product meets the predetermined performance standards and customer requirements. In the raw material preparation and pretreatment stage, in addition to performing the steps in claim 1, the mixture is also sent to a high-speed grinder, and the mixture is refined to a particle size of less than 50μm by a high-speed rotating blade to ensure that the asphalt and the modifier can react more fully in the subsequent steps. The implementation of this step significantly improves the uniformity and performance of the modified asphalt.
[0021] In the present invention, a modified asphalt deashing process has the following specific steps: a. Raw material preparation and pretreatment: Select a base asphalt that meets national standards as the main raw material, and select a polymer as a modifier according to the modification requirements. The base asphalt and the polymer are mixed in a ratio of 10:1 and sent to the pretreatment equipment. The pretreatment includes removing impurities and moisture by heating to 150°C, and using a high-speed grinder to refine the mixture to a particle size of less than 50μm to ensure that the two can be fully fused. b. Melting and reaction stage: The pretreated mixture is sent to a closed melting reactor with a high-efficiency stirring device, the reaction temperature is controlled to 180°C, and the reaction time is 2 hours, so that the asphalt and the modifier are completely mixed and chemically reacted to form modified asphalt. At the same time, an appropriate amount of antioxidant is added to improve the durability of the modified asphalt, c. Deashing treatment: The modified asphalt is sent to the deashing device, treated with an acidic solution to dissolve the ash, and the dissolved ash is removed by a filtration system. During the deashing process, the treatment conditions are strictly controlled to avoid adverse effects on the main structure of the modified asphalt. d. Post-treatment and quality control: The modified asphalt after deashing is cooled and homogenized to ensure the stability and consistency of product quality. Ash content determination, viscosity test and aging test quality inspection methods are used to ensure that the final product meets the predetermined performance standards and customer requirements. In the melting and reaction stage, a closed melting reactor with an efficient stirring device is used to control the reaction temperature to 180°C and the reaction time to 2 hours. The efficient stirring device of the melting reactor ensures that the asphalt and the modifier are fully mixed at a constant temperature and pressure, avoiding oxidation and volatilization losses. After this step of treatment, the modifier is fully dispersed and embedded in the asphalt matrix, forming a modified asphalt with excellent performance.
[0022] In the present invention, a modified asphalt deashing process has the following specific steps: a. Raw material preparation and pretreatment: Select a base asphalt that meets national standards as the main raw material, and select a polymer as a modifier according to the modification requirements. The base asphalt and the polymer are mixed in a ratio of 10:1 and sent to the pretreatment equipment. The pretreatment includes removing impurities and moisture by heating to 150°C, and using a high-speed grinder to refine the mixture to a particle size of less than 50μm to ensure that the two can be fully fused. b. Melting and reaction stage: The pretreated mixture is sent to a closed melting reactor with a high-efficiency stirring device, the reaction temperature is controlled to 180°C, and the reaction time is 2 hours, so that the asphalt and the modifier are completely mixed and chemically reacted to form modified asphalt. At the same time, an appropriate amount of antioxidant is added to improve the durability of the modified asphalt, c. Deashing treatment: The modified asphalt is sent to the deashing device, treated with an acidic solution to dissolve the ash, and the dissolved ash is removed by a filtration system. During the deashing process, the treatment conditions are strictly controlled to avoid adverse effects on the main structure of the modified asphalt. d. Post-treatment and quality control: The modified asphalt after deashing is cooled and homogenized to ensure the stability and consistency of product quality. Ash content determination, viscosity test and aging test quality inspection methods are used to ensure that the final product meets the predetermined performance standards and customer requirements. In the deashing stage, a multi-stage filtration system is used. The first stage uses a 100-mesh filter for coarse filtration to remove larger ash particles; the second stage uses a microporous membrane with a pore size of 5μm for fine filtration to further remove tiny ash particles. The implementation of this step ensures that the ash content of the modified asphalt meets the predetermined standard.
[0023] In the present invention, a modified asphalt deashing process has the following specific steps: a. Raw material preparation and pretreatment: Select a base asphalt that meets national standards as the main raw material, and select a polymer as a modifier according to the modification requirements. The base asphalt and the polymer are mixed in a ratio of 10:1 and sent to the pretreatment equipment. The pretreatment includes removing impurities and moisture by heating to 150°C, and using a high-speed grinder to refine the mixture to a particle size of less than 50μm to ensure that the two can be fully fused. b. Melting and reaction stage: The pretreated mixture is sent to a closed melting reactor with a high-efficiency stirring device, the reaction temperature is controlled to 180°C, and the reaction time is 2 hours, so that the asphalt and the modifier are completely mixed and chemically reacted to form modified asphalt. At the same time, an appropriate amount of antioxidant is added to improve the durability of the modified asphalt, c. Deashing treatment: The modified asphalt is sent to the deashing device, treated with an acidic solution to dissolve the ash, and the dissolved ash is removed by a filtration system. During the deashing process, the treatment conditions are strictly controlled to avoid adverse effects on the main structure of the modified asphalt. d. Post-treatment and quality control: The modified asphalt after deashing is cooled and homogenized to ensure the stability and consistency of product quality. The final product is ensured to meet the predetermined performance standards and customer requirements through ash content determination, viscosity test and aging test quality inspection methods. Before the modified asphalt is filtered through the microporous membrane, it is sent to the ultrasonic processor and the asphalt is ultrasonically treated at 20kHz and 1000W for 30 minutes. Ultrasonic treatment promotes the dispersion and separation of ash, and improves the filtration efficiency and quality. After this step of treatment, the ash content of the modified asphalt is further reduced.
[0024] In the present invention, a modified asphalt deashing process has the following specific steps: a. Raw material preparation and pretreatment: Select a base asphalt that meets national standards as the main raw material, and select a polymer as a modifier according to the modification requirements. The base asphalt and the polymer are mixed in a ratio of 10:1 and sent to the pretreatment equipment. The pretreatment includes removing impurities and moisture by heating to 150°C, and using a high-speed grinder to refine the mixture to a particle size of less than 50μm to ensure that the two can be fully fused. b. Melting and reaction stage: The pretreated mixture is sent to a closed melting reactor with a high-efficiency stirring device, the reaction temperature is controlled to 180°C, and the reaction time is 2 hours, so that the asphalt and the modifier are completely mixed and chemically reacted to form modified asphalt. At the same time, an appropriate amount of antioxidant is added to improve the durability of the modified asphalt, c. Deashing treatment: The modified asphalt is sent to the deashing device, treated with an acidic solution to dissolve the ash, and the dissolved ash is removed by a filtration system. During the deashing process, the treatment conditions are strictly controlled to avoid adverse effects on the main structure of the modified asphalt. d. Post-processing and quality control: The modified asphalt after deashing is cooled and homogenized to ensure the stability and consistency of product quality. Ash content determination, viscosity test and aging test quality inspection methods are used to ensure that the final product meets the predetermined performance standards and customer requirements. In the post-processing stage, in addition to executing the steps in claim 1, the modified asphalt is also specially color-tuned. By adding an appropriate amount of colorant, the color of the modified asphalt is adjusted to meet specific requirements, thereby improving the aesthetics and market competitiveness of the product.
[0025] In the present invention, a modified asphalt deashing process has the following specific steps: a. Raw material preparation and pretreatment: Select a base asphalt that meets national standards as the main raw material, and select a polymer as a modifier according to the modification requirements. The base asphalt and the polymer are mixed in a ratio of 10:1 and sent to the pretreatment equipment. The pretreatment includes removing impurities and moisture by heating to 150°C, and using a high-speed grinder to refine the mixture to a particle size of less than 50μm to ensure that the two can be fully fused. b. Melting and reaction stage: The pretreated mixture is sent to a closed melting reactor with a high-efficiency stirring device, the reaction temperature is controlled to 180°C, and the reaction time is 2 hours, so that the asphalt and the modifier are completely mixed and chemically reacted to form modified asphalt. At the same time, an appropriate amount of antioxidant is added to improve the durability of the modified asphalt, c. Deashing treatment: The modified asphalt is sent to the deashing device, treated with an acidic solution to dissolve the ash, and the dissolved ash is removed by a filtration system. During the deashing process, the treatment conditions are strictly controlled to avoid adverse effects on the main structure of the modified asphalt. d. Post-treatment and quality control: The modified asphalt after deashing is cooled and homogenized to ensure the stability and consistency of product quality. Ash content determination, viscosity test and aging test quality inspection methods are used to ensure that the final product meets the predetermined performance standards and customer requirements. During the entire processing process, the production equipment and pipelines are cleaned and disinfected regularly. Use special cleaning agents and disinfectants to thoroughly clean and disinfect equipment and pipelines to prevent cross contamination. The implementation of this step ensures the purity and safety of product quality.
[0026] In the present invention, at the final stage of the processing, the modified asphalt that has been deashed and meets the quality requirements is stored in a special storage tank. The storage tank is made of thermal insulation material to maintain the stability of the product. During transportation, necessary thermal insulation and protective measures are taken, such as using an insulated vehicle or an insulated box, to maintain the stability of the product and extend its service life.
[0027] In the present invention, a modified asphalt deashing process has the following specific steps: a. Raw material preparation and pretreatment: Select a base asphalt that meets national standards as the main raw material, and select a polymer as a modifier according to the modification requirements. The base asphalt and the polymer are mixed in a ratio of 10:1 and sent to the pretreatment equipment. The pretreatment includes removing impurities and moisture by heating to 150°C, and using a high-speed grinder to refine the mixture to a particle size of less than 50μm to ensure that the two can be fully fused. b. Melting and reaction stage: The pretreated mixture is sent to a closed melting reactor with a high-efficiency stirring device, the reaction temperature is controlled to 180°C, and the reaction time is 2 hours, so that the asphalt and the modifier are completely mixed and chemically reacted to form modified asphalt. At the same time, an appropriate amount of antioxidant is added to improve the durability of the modified asphalt, c. Deashing treatment: The modified asphalt is sent to the deashing device, treated with an acidic solution to dissolve the ash, and the dissolved ash is removed by a filtration system. During the deashing process, the treatment conditions are strictly controlled to avoid adverse effects on the main structure of the modified asphalt. d. Post-treatment and quality control: The modified asphalt after deashing is cooled and homogenized to ensure the stability and consistency of product quality. Ash content determination, viscosity test and aging test quality inspection methods are used to ensure that the final product meets the predetermined performance standards and customer requirements. In the melting and reaction stage, in addition to performing the steps in claim 1, antioxidants and stabilizer additives are also added. The addition of these additives further improves the durability and stability of the modified asphalt. After this step of treatment, the performance of the modified asphalt is more excellent and can meet a wider range of application needs.
[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can replace or change the technical solution and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A modified asphalt deashing process, characterized in that: The following steps are involved: a. Raw material preparation and pretreatment: Select base asphalt that meets the quality standards as the main raw material, and select the corresponding modifier according to the modification requirements, such as polymer, rubber powder or thermoplastic elastomer. Mix the base asphalt and modifier in a preset ratio and perform pretreatment, including removing impurities and moisture, and heating the asphalt and modifier to a suitable reaction temperature to ensure that the two can be fully integrated; b. Melting and reaction stage: The pretreated mixture is fed into a melting reactor and melted under a controlled temperature and pressure environment so that the asphalt and the modifier are completely mixed and chemically reacted to form modified asphalt; c. Deashing: The modified asphalt is sent to the deashing device and the ash is removed by chemical or physical methods. The specific methods include but are not limited to using acidic solution to dissolve the ash, using ultrasound or high-voltage electric field to promote ash separation, or using filtration and centrifugal physical means to directly remove ash particles. The treatment conditions need to be precisely controlled during the deashing process; d. Post-processing and quality control: The modified asphalt after deashing is further processed, such as cooling and homogenization, to ensure the stability and consistency of product quality. At the same time, strict quality testing methods are used, such as ash content determination, viscosity test and aging test.
2. A modified asphalt deashing process according to claim 1, characterized in that: In step a, the pretreatment also includes sending the mixture into a high-speed grinder or shear mixer to refine the mixture to a particle size of less than 50 μm through high-speed rotating blades or shearing action, ensuring that the two can react more fully in the subsequent steps.
3. The modified asphalt deashing process according to claim 1 or 2, characterized in that: The melt reactor in step b adopts a closed melt reactor with an efficient stirring device to ensure that the asphalt and the modifier are fully mixed at a constant temperature and pressure to avoid oxidation and volatilization losses. The reaction temperature is controlled to be around 180°C and the reaction time is 2 hours to allow the modifier to be fully dispersed and embedded in the asphalt matrix.
4. The modified asphalt deashing process according to claim 1, characterized in that: The deashing device in step c adopts a multi-stage filtration system. The first stage adopts a 100-mesh filter for coarse filtration to remove larger ash particles; the second stage adopts a microporous membrane or a ceramic filter element with a pore size of 5 μm for fine filtration.
5. The modified asphalt deashing process according to claim 4, characterized in that: Before the modified asphalt is filtered through the microporous membrane, it is sent to an ultrasonic processor and the asphalt is ultrasonically treated for 30 minutes at 20kHz and a power of 1000W.
6. The modified asphalt deashing process according to claim 1, characterized in that: The post-treatment in step d also includes coloring the modified asphalt to adjust its color to meet specific requirements and improve the aesthetics and market competitiveness of the product.
7. The modified asphalt deashing process according to claim 1, characterized in that: The entire processing process also includes cleaning and disinfection of production equipment and pipelines to prevent cross contamination and ensure the purity and safety of product quality.
8. The modified asphalt deashing process according to claim 1, characterized in that: It also includes step e, i.e. product storage and transportation, in which the modified asphalt that has been deashed and meets quality requirements is stored in a special storage tank, and necessary insulation and protection measures are taken during transportation to maintain the stability of the product and extend its service life.
9. The modified asphalt deashing process according to claim 1, characterized in that: It also includes adding antioxidants and stabilizer additives in step b to further improve the durability and stability of the modified asphalt.