Avoiding gradation refinement of waste asphalt mixture refinement separation system and working method thereof

CN117483382BActive Publication Date: 2026-07-07HOHAI UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HOHAI UNIV
Filing Date
2023-10-18
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

In existing technologies, RAP produced by conventional screening methods is coarse and the simple grading cannot meet the higher requirements for road performance. Furthermore, fine separation leads to unstable quality, large fluctuations, and increased clumping rate of recycled asphalt mixtures.

Method used

A liquid nitrogen cooling device is used to cool the waste asphalt mixture before the stripper, keeping its temperature within the range of -20℃ to -10℃. The aggregate and asphalt are separated by the stripper, and fine screening is carried out by vibrating screen and high-frequency screen to form material piles of different particle sizes, thereby reducing the proportion of fine material and reducing the agglomeration rate.

Benefits of technology

This process avoids gradation refinement during fine separation, improves the quality stability of recycled asphalt mixtures, reduces the proportion of fine aggregates and the agglomeration rate, and meets higher road performance requirements.

✦ Generated by Eureka AI based on patent content.

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    Figure CN117483382B_ABST
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Abstract

The application discloses a waste asphalt mixture fine separation system capable of avoiding gradation refinement and a working method thereof. The system comprises a control room and sequentially connected material selection devices, belt conveying devices, elevators, liquid nitrogen cooling devices, stripping machines, vibrating screens, high-frequency screens, finished product conveying devices and stock bins. The liquid nitrogen cooling device comprises a weighing device, a cooling device and a collected material conveying device. The weighing device comprises a distribution box. The cooling device comprises a liquid nitrogen conveying pool and a cooling liquid circulating pool. The collected material conveying device comprises a feeding port, a collected material conveying bin, a motor set box and a discharging bin. The feeding port is arranged on the distribution box. The outlet of the distribution box is connected with the inlet of the collected material conveying bin. The outlet of the collected material conveying bin is connected with the discharging bin. The liquid nitrogen conveying pool and the cooling liquid circulating pool are arranged at the bottom of the collected material conveying bin. The motor set box is arranged between the liquid nitrogen conveying pool and the cooling liquid circulating pool. The application avoids gradation refinement and reduces the clumping rate and variability of RAP.
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