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Method for preparing recycled aggregate through construction waste

A technology of recycled aggregate and construction waste, which is applied in the direction of construction waste recycling, recycling technology, and furniture waste recycling. Ineffective and other problems, to reduce heat transfer, reduce insufficient contact, reduce the effect of strength

Active Publication Date: 2020-06-23
深圳绿景环保再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above existing technical solutions have the following defects: the ball mill mainly removes the cement mortar through the impact grinding process of the steel ball on the recycled aggregate, but the surface of the recycled aggregate is usually uneven. The removal effect of the cement mortar on the protrusion is better; for the cement mortar on the smooth surface of the recycled aggregate or even the depression, it is mainly removed by the impact of the steel ball, and the connection between the cement mortar and the recycled aggregate is strong. , so that the effect of steel ball impact removal is not good; this makes the overall effect of recycled aggregate removal of cement mortar not very good, although the removal effect of cement mortar can also be improved by increasing the grinding time of the ball mill for recycled aggregate, but Cracks may occur inside the recycled aggregate due to the steel ball impact grinding time being too long, reducing the structural strength of the recycled aggregate

Method used

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  • Method for preparing recycled aggregate through construction waste

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Effect test

Embodiment 1

[0042]refer to figure 1 , is a kind of method that utilizes construction waste to prepare recycled aggregate disclosed by the present invention, comprises the following steps:

[0043] S1: Pre-shredding and pre-screening the construction waste generated by the demolition of an abandoned factory to remove steel bars, wood, glass, plastics and wires to obtain waste solid materials with a particle size of less than 200mm.

[0044] Specifically, the pre-crushing and pre-screening in step S1 are all carried out manually, mainly by hammering, cutting and sorting to remove steel bars, wood, glass, plastics and wires to obtain particles with a particle size of less than 200 mm. The waste solid materials are transported to the crusher by plate chain conveyor.

[0045] S2: Use a crusher to crush waste solid materials for the first time to obtain primary materials with a particle size below 40mm;

[0046] Specifically, the crusher used in step S2 is a jaw crusher.

[0047] S3: Sorting...

Embodiment 2

[0058] refer to figure 1 , is a method for preparing recycled aggregates from construction waste disclosed in the present invention. The difference between this embodiment and Embodiment 1 is that the processing process of step S5 is different from that of step S6. details as follows:

[0059] S5: Put the secondary material obtained in step S4 into the airtight container, and keep the volume ratio of the volume of the secondary material and the airtight container at 0.5:1, that is, the filling factor of the secondary material is 0.5; drive the airtight container at 45n Rotate at a speed of 1 / min, and pass in water vapor mixed with acetic acid molecules through the steam valve of the airtight container. Specifically, the amount of acetic acid molecules in the water vapor accounts for 5%; until the temperature in the airtight container reaches 200°C , Atmospheric pressure reaches 1.5MPa, stop feeding water vapor, close the steam valve, after the pressure is constant, keep const...

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Abstract

The invention relates to the technical field of construction waste recovery processing, in particular to a method for preparing recycled aggregate through construction waste. The method comprises thefollowing steps that construction waste is pre-crushed and prescreened to obtain a waste solid material, the waste solid material is subjected to primary crushing, a recycled aggregate primary productand crushed aggregates are obtained after impurity removal and vibration screening, and the recycled aggregate primary product is subjected to secondary crushing and vibration screening to obtain a second-stage material and crushed aggregates; the a second-stage material is loaded into a sealed container and heated after water vapor is injected, and coarse recycled aggregate and fine recycled aggregate are obtained through grinding, screening and winnowing. Through the method, cement mortar at the smooth position and the concave position of the surface of the recycled aggregate can be conveniently removed, and accordingly, the integrated removal rate of the cement mortar on the surface of the recycled aggregate is increased, the heat dissipation effect of the mode of conducting heating through the water vapor is good, and the follow-up sewage treatment problem is avoided.

Description

technical field [0001] The invention relates to the technical field of recycling and processing of construction waste, in particular to a method for preparing recycled aggregates from construction waste. Background technique [0002] With the steady advancement of urbanization in our country, many urban and rural buildings have been demolished, resulting in a large amount of construction waste, which has caused a bad impact on my country's environmental protection. At the same time, a large amount of natural sand and gravel is consumed in the process of urbanization, and our country's natural sand and gravel aggregate resources are increasingly scarce. If the construction waste is recycled, it can not only save a lot of construction funds and resources, but also reduce the consumption of natural resources and reduce the environmental load, which is in line with my country's sustainable development strategy. [0003] At present, the recycling scheme for construction waste is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C04B18/16
CPCB09B3/00C04B18/16Y02W30/58Y02W30/78Y02W30/91
Inventor 康洪君
Owner 深圳绿景环保再生资源有限公司
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