Separation method of highway RAP (Reclaimed Asphalt Pavement) material

A technology for waste asphalt and pavement materials, applied in separation methods, chemical instruments and methods, preparation of liquid hydrocarbon mixtures, etc., to achieve the effect of low production costs

Active Publication Date: 2019-01-25
凌港
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a separation method for the industrial production of road waste asphalt pavement (RAP), which solves the problem of extracting industrial production process of road waste asphalt pavement (RAP). The bottleneck problem in the separation process, the highway waste asphalt pavement (RAP) is processed through specific composite solvents and process parameters, the extraction rate of asphalt oil is more than 95%, and the asphalt residue in the separated sand and gravel is 0.2- 0.3%, meeting the requirements of "Technical Specifications for Highway Asphalt Pavement Construction" (JTG-F40-2004)

Method used

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  • Separation method of highway RAP (Reclaimed Asphalt Pavement) material

Examples

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Embodiment 1

[0032] The present embodiment road waste asphalt pavement material (RAP) separation method, flow process is as follows figure 2 , including the following steps:

[0033] (1) Highway waste asphalt pavement materials (RAP) include asphalt oil, sand and gravel materials, and the content of asphalt oil is 4-5%; the raw materials are transported to the pulverizer by the conveyor, and crushed to particles with a particle size below 50mm; then transported by the conveyor Dried in a dryer, dried and dehydrated at 50-65°C, and transported to the extractor by a conveyor.

[0034] (2) Highway waste asphalt pavement (RAP) is extracted by the composite solvent in the extractor. The composite solvent is placed in the solvent circulation tank, and after being extracted from the solvent circulation tank by the solvent pump, it enters the extractor through the solvent inlet. In; The usage amount of composite solvent is 0.5wt.% of the weight of raw material. The temperature of the extraction...

Embodiment 2

[0038] The difference from Example 1 is:

[0039] The composition of the composite solvent is: No. 120 mineral spirits 60wt.%, petroleum ether 24.5wt.%, n-heptane 15.5wt.%.

[0040] According to the operation steps of Example 1, after the raw material of road waste asphalt pavement (RAP) is separated and extracted, the extraction rate of asphalt is more than 94.2%.

[0041] In the separated sand and gravel, 0.25% of asphalt remains.

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Abstract

The invention discloses a separation method of a highway RAP (Reclaimed Asphalt Pavement) material, and belongs to the technical field of separation of the highway RAP material. The method comprises:firstly, after grinding and drying the highway RAP material, inputting the ground and dried highway RAP material into an extractor; after carrying out extraction processing by a composite solvent, separating out asphalt oil and a sand and gravel material; after evaporating mixed oil formed by the asphalt oil and the composite solvent by a distillation still, pumping the obtained asphalt oil into an asphalt oil tank; condensing evaporated composite solvent gas into liquid for recycling; heating residual materials in the extractor to a temperature of 90 to 130 DEG C, controlling a vacuum degreeto be within a range of 1.5 to 3KPa, and after converting the residual composite solvent in the sand and gravel material into gas for output, outputting the sand and gravel material. In the separationprocess, the highway RAP material is processed by the specific composite solvent and process parameters, an extraction rate of the asphalt oil is 94% or more, and less asphalt is left in the separated sand and gravel material.

Description

technical field [0001] The invention relates to the technical field of separating waste and old asphalt pavement materials for highways, in particular to a method for separating waste and old asphalt pavement materials for highways. Background technique [0002] Highway waste asphalt pavement (RAP) is the waste asphalt pavement material produced during milling and excavation during highway renovation. Among them, the content of asphalt is 4-5%, and stone materials (coarse aggregate, fine aggregate, mineral powder) account for 95-96%. [0003] my country's highway mileage is 4.7735 million kilometers, and 340 million tons of waste asphalt pavement (RAP) is produced every year. The Ministry of Transport's "Guiding Opinions on Accelerating the Recycling of Highway Pavement Materials" pointed out that in 2020, the country will achieve "zero waste" of waste road fabric materials. [0004] At present, waste asphalt materials at home and abroad use cold and hot regeneration treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/02C10G1/00
CPCB01D11/02B01D11/0288C10G1/00C10G2300/1003
Inventor 凌港凌雨赋赵兴元欧阳子文
Owner 凌港
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