CN108097450B - Method for recycling old materials of asphalt pavement - Google Patents
Method for recycling old materials of asphalt pavement Download PDFInfo
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- CN108097450B CN108097450B CN201810015029.5A CN201810015029A CN108097450B CN 108097450 B CN108097450 B CN 108097450B CN 201810015029 A CN201810015029 A CN 201810015029A CN 108097450 B CN108097450 B CN 108097450B
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Abstract
The invention discloses a method for recycling old materials of an asphalt pavement, which comprises the following steps: 1) selectively crushing the old material of the asphalt pavement, and then obtaining a sandstone aggregate A with large specific gravity and an asphalt light material B with small specific gravity by utilizing the specific gravity difference of the light and heavy materials; 2) wet grinding the asphalt light material B to 40-70% of-200 meshes, and adjusting the concentration of the ore pulp to 20-40% to obtain ore pulp C; 3) adding a collecting agent into the ore pulp C, stirring for 3-10min, adding a foaming agent, stirring for 1-3min, and performing primary roughing for 5-10min to obtain asphalt rough concentrate D and tailings E; 4) carrying out concentration twice on the asphalt rough concentrate D to obtain asphalt concentrate F; 5) and filtering, naturally airing or drying the asphalt concentrate F to obtain asphalt powder. The invention has the characteristics of good sorting effect, simple flow, clean production, safety, environmental protection and low energy consumption.
Description
Technical Field
The invention belongs to the field of recycling of solid waste resources. More specifically, the method is based on the material composition of the old asphalt pavement material and the physical characteristics of each component, and utilizes a physical separation method to selectively sort out asphalt, coarse aggregate and fine aggregate from the old asphalt pavement material in high selectivity, thereby providing technical support for high-quality recycling of the old asphalt pavement material.
Background
By 2016, the mileage of second-level and higher-level roads in China is 60.12 kilometers, and the mileage of expressways is 13.10 kilometers, wherein most of the roads adopt asphalt mixture pavements. In the long-term use process of the asphalt mixture pavement, due to the effects of heating and various natural factors, asphalt is gradually aged, the colloid structure is changed, the durability of the pavement is reduced, and the normal operation of the pavement is directly influenced. To ensure stable operation of the road system and prolonged service life, maintenance and repair of the relevant road are required, and a large amount of old asphalt pavement is generated during the maintenance and repair. At present, when the maintenance and treatment of the asphalt pavement are carried out, thousands of tons of old asphalt pavement materials are generated in China every year, and the methods and the approaches for recycling the old asphalt pavement materials mainly comprise:
1, directly crushing the mixture to be used as a construction material for a secondary and tertiary pavement layer or a base layer. Because the old asphalt pavement material has long-term effects of environment, temperature and the like, the performance of the old asphalt pavement material is far inferior to that of a new asphalt mixture, the laid foundation is uneven, and the old asphalt pavement material is easy to be wrapped and turned into slurry again.
2, directly adding a curing agent, such as an asphalt regeneration curing agent in Chinese patent CN103756338A, which is characterized in that local treatment is mainly carried out on a road asphalt pavement with diseases, and the method is suitable for treating a road repairing process with smaller pavement repairing scale and less old asphalt materials and does not use large-scale operation.
3. The direct heating and melting and re-paving have the problems that the crushed stone is also heated to the melting point of the asphalt, the energy consumption is high, the old asphalt is aged, and the performance cannot be guaranteed.
4. After being crushed, the hot-melt new material is added, and the pavement is paved again. Because the proportion of the crushed stone and the asphalt of the waste is fixed, the proportion of the crushed stone and the asphalt is not easy to adjust according to new design requirements.
5. A method for pretreating an old asphalt reclaimed material. Although the utilization rate of the waste asphalt reclaimed materials can be improved after the planed asphalt waste materials are subjected to simple crushing and screening treatment, the waste asphalt cannot be obviously enriched, and the application range of the waste asphalt cannot be expanded, for example, Chinese patent CN104294730A, namely a waste asphalt reclaimed material pretreatment method.
6. The method provided by the patent can not obtain asphalt-rich aggregate with high asphalt content, such as Chinese patent CN107309072A, the name of which is broken stone asphalt waste fine sorting recycling method.
With the rising price of asphalt raw materials, the asphalt recycling industry is rapidly developing, and in view of the fact that a large amount of sundries exist in old asphalt pavement materials generated during highway maintenance, the physical performance of asphalt can be damaged through simple crushing, heating and recycling, and secondary pollution is easily caused. In order to recycle all the old asphalt pavement materials, improve the performance and use value of the waste asphalt, and fully pay attention to the physical property characteristics of the old asphalt pavement materials, it is necessary to develop a fine mineral separation method for the old asphalt pavement materials and a preparation method for asphalt powder.
Disclosure of Invention
In order to solve the problems of recycling of old asphalt pavement materials and efficient enrichment of old asphalt, the invention aims to provide a method for recycling the old asphalt pavement materials, which successfully obtains sandstone aggregate with the yield of more than 50 percent, asphalt concentrate with the yield of 5-12 percent and the concentrate grade of more than 50 percent and flotation tailings with the asphalt content of less than 1.25 percent by a physical separation mode combining selective crushing, gravity separation and flotation.
The technical scheme adopted by the invention to solve the problems is as follows:
a method for recycling old materials of an asphalt pavement comprises the following steps:
1) selectively crushing the old material of the asphalt pavement, and then obtaining a sandstone aggregate A with large specific gravity and an asphalt light material B with small specific gravity by utilizing the specific gravity difference of the light and heavy materials;
2) wet grinding the asphalt light material B to 40-70% of-200 meshes, and adjusting the concentration of the ore pulp to 20-40% to obtain ore pulp C;
3) adding a collecting agent into the ore pulp C, stirring for 3-10min, adding a foaming agent, stirring for 1-3min, and performing primary roughing for 5-10min to obtain asphalt rough concentrate D and tailings E;
4) carrying out concentration twice on the asphalt rough concentrate D to obtain asphalt concentrate F;
5) and filtering, naturally airing or drying the asphalt concentrate F to obtain asphalt powder.
Specifically, as shown in fig. 1, a method for recycling old asphalt pavement materials comprises the steps of selectively crushing the old asphalt pavement materials, feeding the crushed materials into a gravity jigger taking water as a medium through a vibrating feeder, obtaining sandstone aggregate A with large specific gravity and asphalt light material B with small specific gravity by utilizing the specific gravity difference of the light and heavy materials, carrying out wet grinding on the asphalt light material B until the ore content is 40-70% of minus 200 meshes, adjusting the concentration of the ore pulp to 20-40%, obtaining ore pulp C, adding diesel oil, kerosene or a combination of the diesel oil and the kerosene into the ore pulp C, stirring for 3-10min, adding a foaming agent, stirring for 1-3min, carrying out primary rough separation for 5-10min, obtaining asphalt rough concentrate D and tailings E, obtaining asphalt concentrate F after twice fine separation of the asphalt rough concentrate D, sequentially returning the obtained middlings 1 and 2 to the previous flotation operation flow, and filtering and drying the obtained final asphalt concentrate F to obtain asphalt powder, naturally settling flotation tailings in a settling pond, directly recycling concentrate filtered wastewater, and clarifying tailing wastewater for recycling.
The jaw crusher with non-vertical fixed lining plate is used for selective crushing, and the upper limit of the granularity of the discharge port is 5-20 mm.
The sandstone aggregate A obtained by adopting the gravity jigger can be automatically screened at a discharge port according to the actual application requirement, so that coarse aggregate with the particle size of more than 5mm and fine aggregate with the particle size of less than 5mm are respectively obtained, and mineral separation water is directly recycled after natural sedimentation.
The concentration of ore grinding ore pulp during wet grinding is 40-60%.
The collecting agent added after obtaining the ore pulp C is diesel oil, kerosene or combined agents prepared by the diesel oil and the kerosene according to different mass ratios, and the dosage is 100-500 g/t.
The foaming agent is terpineol oil, and the dosage of the terpineol oil is 50-150 g/t.
The concentration of the ore pulp in the concentration of the coarse asphalt concentrate D is 15-30%, and a regulator is added before the concentration, wherein the regulator is water glass, and the dosage is 50-300 g/t.
The asphalt concentrate F can be naturally dried or directly dried after being filtered, but the temperature is less than or equal to 45 ℃ during drying.
The invention has the beneficial effects that:
compared with the existing asphalt pavement old material treatment method, the method has the advantages of high selectivity of recycling old asphalt, controllable product quality, thorough physical impurity removal, clean and environment-friendly process, easy reuse of the obtained product during road repair and maintenance, and the like. Meanwhile, the asphalt powder obtained by the invention has low production cost and friendly operation environment, can promote the technical progress of the old asphalt recycling industry, improves the performance and the use value of the old asphalt, and is beneficial to the green cycle sustainable development of the road traffic field.
The invention can finely recover raw materials such as asphalt, gravel aggregate and the like on the premise of high-selectivity crushing, and can obviously reduce the cost of highway maintenance and repair.
The invention relates to a method for recycling an old material of an asphalt pavement, belonging to the field of recycling of solid waste resources. The patent provides a fine mineral separation and asphalt powder preparation process for old asphalt materials generated during aging or damage renovation of asphalt pavement paving materials. The three mineral separation products obtained by separating the old asphalt pavement materials by the method are easy to recycle in road repair, wherein asphalt concentrate is used as asphalt powder and can be directly used for preparing emulsified asphalt.
The method realizes the high-selectivity separation of the asphalt and the gravel aggregate in the old asphalt pavement materials, and has the characteristics of good separation effect, simple process, clean production, safety, environmental protection and low energy consumption. The separation method in the patent provides a new idea and solution for efficient recycling of a large amount of sandstone aggregates and asphalt resources in the old asphalt pavement materials, is beneficial to protecting the environment, saving resource and energy, and can remarkably improve the economic value of the old asphalt pavement materials.
Drawings
FIG. 1 is a process flow chart of the method for recycling the old asphalt pavement material.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
The present invention will be further described in detail with reference to the following specific examples, but the scope of the present invention is not limited to the following examples. The procedures, conditions, reagents, experimental methods and the like for carrying out the present invention are general knowledge and common general knowledge in the art except for the contents specifically mentioned below, and the present invention is not particularly limited.
Example 1
As shown in fig. 1, a method for recycling an old material of an asphalt pavement comprises the following steps:
1) selectively crushing the old material of the asphalt pavement of the highway, wherein the upper limit of the crushing granularity is 20 mm;
2) using water as a medium, and adopting a gravity jigger to carry out primary sorting to obtain sandstone aggregate A and asphalt lightweight material B;
3) wet ball milling the asphalt lightweight material B, wherein the milling concentration is 60%, the milling fineness is 70% with the size of minus 0.074mm, then adjusting the ore pulp concentration to 30%, and performing primary roughing on the obtained ore pulp C;
4) during primary roughing, sequentially adding 120g/t of diesel oil as a collecting agent, stirring for 5min, then adding 50g/t of pinitol oil as a foaming agent, stirring for 2min, and then performing flotation for 5min to obtain a foam product, namely asphalt rough concentrate D, and bottom flow is flotation tailings E;
5) mixing the asphalt rough concentrate D to obtain 20% pulp, carrying out primary concentration, adding water glass with the dosage of 50g/t before the concentration, stirring for 5min, and then carrying out flotation for 5min to obtain a foam product, namely asphalt concentrate 1;
6) the asphalt concentrate 1 is refined again, the refining time is 5min, the obtained foam product is asphalt concentrate F, and the bottom flow returns to the previous operation flow in sequence; the middling 1 and the middling 2 obtained in the fine selection are sequentially returned to the previous flotation operation flow;
7) and filtering the asphalt concentrate F, and naturally airing to obtain asphalt powder.
The beneficiation indicators obtained by the above method are shown in table 1.
TABLE 1 Ore dressing index/percent obtained after fine ore dressing of old asphalt pavement materials
Example 2
As shown in fig. 1, a method for recycling an old material of an asphalt pavement comprises the following steps:
1) selectively crushing the old material of the asphalt pavement of the highway, wherein the upper limit of the crushing granularity is 5 mm;
2) using water as a medium, and adopting a gravity jigger to carry out primary sorting to obtain sandstone aggregate A and asphalt lightweight material B;
3) carrying out wet ball milling on the asphalt lightweight material B, wherein the milling concentration is 40%, the milling fineness is 60% with minus 0.074mm, then adjusting the ore pulp concentration to 40%, and obtaining ore pulp C for primary roughing;
4) during primary roughing, sequentially adding 150g/t of kerosene serving as a collecting agent, stirring for 3min, then adding 50g/t of terpineol serving as a foaming agent, stirring for 2min, and performing flotation for 7min to obtain a foam product, namely asphalt rough concentrate D, and bottom flow, namely flotation tailings E;
5) mixing the asphalt rough concentrate D to obtain 20% pulp, carrying out primary concentration, adding water glass before concentration, stirring for 5min with the amount of 100g/t, and then carrying out flotation for 5min to obtain a foam product, namely asphalt concentrate 1;
6) the asphalt concentrate 1 is refined again, the refining time is 5min, the obtained foam product is asphalt concentrate F, and the bottom flow returns to the previous operation flow in sequence; the middling 1 and the middling 2 obtained in the fine selection are sequentially returned to the previous flotation operation flow;
7) and (4) filtering the asphalt concentrate, drying at a low temperature to obtain asphalt powder, wherein the temperature of an oven is 45 ℃.
The beneficiation indicators obtained by the above method are shown in table 2.
TABLE 2 Ore dressing index/percent obtained after fine ore dressing of old asphalt pavement materials
| Product name | Yield of | Asphalt content | Asphalt recovery rate |
| Aggregate of sandstone | 53.47 | 1.78 | 15.83 |
| Bitumen concentrate | 6.98 | 65.47 | 76.01 |
| Flotation of tailings | 39.55 | 1.24 | 8.16 |
| Old material for asphalt pavement | 100 | 6.01 | 100.00 |
Example 3
As shown in fig. 1, a method for recycling an old material of an asphalt pavement comprises the following steps:
1) selectively crushing the old material of the asphalt pavement of the highway, wherein the upper limit of the crushing granularity is 15 mm;
2) using water as a medium, and adopting a gravity jigger to carry out primary sorting to obtain sandstone aggregate A and asphalt lightweight material B;
3) wet ball milling the asphalt lightweight material B, wherein the milling concentration is 50%, the milling fineness is 50% with the size of minus 0.074mm, then adjusting the ore pulp concentration to 35%, and performing primary roughing on the obtained ore pulp C;
4) during primary roughing, adding 500g/t of diesel oil and kerosene (the mass ratio is 1:1) serving as collecting agents, stirring for 5min, adding 50g/t of pine oil serving as foaming agents, stirring for 2min, and performing flotation for 7min to obtain a foam product which is asphalt rough concentrate D, wherein bottom flow is flotation tailings E;
5) mixing the asphalt rough concentrate D to obtain 25% pulp, carrying out primary concentration, adding water glass with the dosage of 50g/t before concentration, stirring for 5min, and then carrying out flotation for 5min to obtain a foam product, namely asphalt concentrate 1;
6) carrying out secondary concentration on the asphalt concentrate 1 for 5min, wherein the obtained foam product is asphalt concentrate F, and the underflow returns to the previous operation flow in sequence; the middling 1 and the middling 2 obtained in the fine selection are sequentially returned to the previous flotation operation flow;
7) and (4) filtering the asphalt concentrate, drying at a low temperature to obtain asphalt powder, wherein the temperature of an oven is 45 ℃.
The beneficiation indicators obtained by the above method are shown in table 3.
TABLE 3 Ore dressing index/percent obtained after fine ore dressing of old asphalt pavement materials
| Product name | Yield of | Asphalt content | Asphalt recovery rate |
| Aggregate of sandstone | 58.27 | 1.78 | 11.41 |
| Bitumen concentrate | 9.98 | 77.47 | 85.06 |
| Flotation of tailings | 31.75 | 1.01 | 3.53 |
| Old material for asphalt pavement | 100.00 | 9.09 | 100.00 |
Example 4
As shown in fig. 1, a method for recycling an old material of an asphalt pavement comprises the following steps:
1) selectively crushing the old material of the asphalt pavement of the highway, wherein the upper limit of the crushing granularity is 10 mm;
2) using water as a medium, and adopting a gravity jigger to carry out primary sorting to obtain sandstone aggregate A and asphalt lightweight material B;
3) wet ball milling the asphalt lightweight material B, wherein the milling concentration is 50%, the milling fineness is 70% with the size of minus 0.074mm, then adjusting the ore pulp concentration to 30%, and performing primary roughing on the obtained ore pulp C;
4) during primary roughing, 300g/t of diesel oil is added as a collecting agent and stirred for 5min, then 150g/t of pinitol oil is added as a foaming agent and stirred for 2min and floated for 5min, and a foam product is obtained and is asphalt rough concentrate D, and underflow is flotation tailings E;
5) mixing the asphalt rough concentrate D to obtain 20% pulp, carrying out primary concentration, adding water glass before concentration, stirring for 5min, and then carrying out flotation for 5min to obtain a foam product, namely asphalt concentrate 1;
6) carrying out concentration again on the asphalt concentrate 1 for 5min, wherein the obtained foam product is asphalt concentrate F, and the underflow returns to the previous operation flow in sequence; the middling 1 and the middling 2 obtained in the fine selection are sequentially returned to the previous flotation operation flow;
7) and (4) filtering the asphalt concentrate, drying at a low temperature to obtain asphalt powder, wherein the temperature of an oven is 45 ℃.
The beneficiation indicators obtained by the above method are shown in table 4.
TABLE 4 Ore dressing index/percent obtained after fine ore dressing of old asphalt pavement materials
| Product name | Yield of | Asphalt content | Asphalt recovery rate |
| Aggregate of sandstone | 66.07 | 2.36 | 15.31 |
| Bitumen concentrate | 11.18 | 75.07 | 82.43 |
| Flotation of tailings | 22.75 | 1.01 | 2.26 |
| Old material for asphalt pavement | 100 | 10.18 | 100.00 |
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A method for recycling old materials of an asphalt pavement comprises the following steps:
1) selectively crushing the old material of the asphalt pavement, and then obtaining a sandstone aggregate A with large specific gravity and an asphalt light material B with small specific gravity by utilizing the specific gravity difference of the light and heavy materials;
2) wet grinding the asphalt light material B to 40-70% of-200 meshes, and adjusting the concentration of the ore pulp to 20-40% to obtain ore pulp C;
3) adding a collecting agent into the ore pulp C, stirring for 3-10min, adding a foaming agent, stirring for 1-3min, and performing primary roughing for 5-10min to obtain asphalt rough concentrate D and tailings E;
4) carrying out concentration twice on the asphalt rough concentrate D to obtain asphalt concentrate F;
5) filtering, naturally airing or drying the asphalt concentrate F to obtain asphalt powder;
the selectively crushed old asphalt pavement material is subjected to sandstone aggregate regeneration by a gravity jigger by taking water as a medium, and simultaneously an asphalt lightweight material is obtained, wherein the asphalt content in the asphalt lightweight material is more than 5%;
collecting agents added into the ore pulp C are diesel oil and/or kerosene, and the using amount is 100-500 g/t;
the foaming agent is terpineol oil, and the dosage of the terpineol oil is 50-150 g/t;
when the concentration of the ore pulp is required to be adjusted to be 15% -30% during the concentration, a regulator is added before the concentration, the regulator is water glass, and the dosage is 50-300 g/t;
and 5) drying at the temperature of less than or equal to 45 ℃.
2. The method for recycling the old asphalt pavement material according to claim 1, wherein the old asphalt pavement material is mechanically and selectively crushed, and the upper limit of the particle size of the discharge port is 5-20mm during crushing.
3. The method for recycling the old asphalt pavement materials according to claim 1, wherein the concentration of ore grinding pulp in wet grinding of the light asphalt materials is 40-60%.
4. The method of claim 1, wherein the bitumen content of the bitumen concentrate F is greater than 50%.
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| CN105435967A (en) * | 2015-12-11 | 2016-03-30 | 中南大学 | Process for floating and recovering asphalt in natural rock asphalite |
| CN107309072A (en) * | 2017-08-28 | 2017-11-03 | 李福军 | Rubble asphalt waste finely sorts reuse method |
| CN206794339U (en) * | 2017-04-13 | 2017-12-26 | 浙江建设职业技术学院 | A kind of building waste recovery system |
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|---|---|---|---|---|
| CN105435967A (en) * | 2015-12-11 | 2016-03-30 | 中南大学 | Process for floating and recovering asphalt in natural rock asphalite |
| CN206794339U (en) * | 2017-04-13 | 2017-12-26 | 浙江建设职业技术学院 | A kind of building waste recovery system |
| CN107309072A (en) * | 2017-08-28 | 2017-11-03 | 李福军 | Rubble asphalt waste finely sorts reuse method |
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| 国外某天然沥青矿提质降灰试验研究;孙浩 等;《煤炭技术》;20150610;第34卷(第6期);第291-292页 * |
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