Method for efficiently and conveniently recovering asphalt on basis of small amount of asphalt mixture

Abstract

The present invention relates to the technical field of solid waste recovery and provides a method for efficiently and conveniently recovering asphalt on the basis of a small amount of an asphalt mixture. The method comprises the following steps: S1, taking an asphalt mixture sample, adding water, and performing ultrasonic cleaning to wash away impurities from the surface of the sample; S2, placing the impurity-removed and dried sample in a mixed solvent for soaking for 20-40 min until the surface of an aggregate is not coated with asphalt, the mixed solvent comprising 1,1-diethoxyethane and methyl tert-butyl ether; and S3, performing vacuum filtration and centrifugation on the mixture in step S2 to separate out a supernatant, placing the supernatant in a fume hood for preliminary volatilization and then in an air blast drying oven to evaporate the solvent at 60-105ºC to obtain recovered asphalt. By means of the compounding of low-boiling solvents 1,1-diethoxyethane and methyl tert-butyl ether, combined with subsequent vacuum filtration, centrifugation and volatilization treatment, the present invention realizes an efficient and convenient method for recovering asphalt from the asphalt mixture. Compared with the existing Abson method and rotary evaporator method, the method has the advantages of high fidelity of recovered asphalt and no organic solvent residue.

Claims

1. A method for efficiently and simply recycling asphalt based on a small amount of asphalt mixture, characterized by: The method comprises the following steps: S1, taking an asphalt mixture sample, adding water and ultrasonic cleaning, and washing off impurities on the surface of the sample; S2, placing the impurity-removed and dried sample in a mixed solvent, soaking for 20-40 min until no asphalt is attached to the surface of the aggregate; the mixed solvent comprises 1,1-diethoxyethane and methyl tert-butyl ether; S3, taking the mixture of step S2, performing vacuum suction filtration and centrifugation, taking the supernatant, placing it in a fume hood for preliminary evaporation, and then placing it in a forced air drying oven for evaporation of the solvent at 60-105℃ to obtain recovered asphalt.

2. The method for efficiently and simply recycling asphalt based on a small amount of asphalt mixture according to claim 1, characterized in that: The volume ratio of 1,1-diethoxyethane to methyl tert-butyl ether is (9-10):(1-2).

3. The method for efficiently and simply recycling asphalt based on a small amount of asphalt mixture according to claim 1, characterized in that: The mixed solvent further comprises 2-methyl-1,3-dioxolane.

4. The method for efficiently and simply recycling asphalt based on a small amount of asphalt mixture according to claim 3, characterized in that: The volume ratio of methyl tert-butyl ether to 2-methyl-1,3-dioxolane is (1-2):

1.

5. The method for efficiently and simply recycling asphalt based on a small amount of asphalt mixture according to claim 1, characterized in that: The liquid level of the mixed solvent is 1-2 cm higher than the highest point of the asphalt mixture.

6. The method for efficiently and simply recycling asphalt based on a small amount of asphalt mixture according to claim 1, characterized in that: Step S2 is operated in a closed container, and the solvent is heated to 30-35℃.

7. The method for efficiently and simply recycling asphalt based on a small amount of asphalt mixture according to claim 1, characterized in that: In step S1, the ultrasonic cleaning is performed at a temperature of 50-60℃ and a frequency of 30-40 kHz.

8. The method for efficiently and simply recycling asphalt based on a small amount of asphalt mixture according to claim 1, characterized in that: In step S3, the filter membrane for vacuum suction filtration is 0.5-1.6 μm.

9. The method for efficiently and simply recycling asphalt based on a small amount of asphalt mixture according to claim 1, characterized in that: In step S3, the centrifugal force is 3000-4000 rpm, the centrifugation time is 0.5-1 h, and the temperature is <35℃.

Images