Construction waste treatment plant is a comprehensive system, including multiple process links, systematically transforming construction waste from a solid waste at the beginning to a recycled material that can be reused. Construction waste crushing and processing equipment mainly consists of the following 4 major systems:

(1) Crushing System

The stationary crushing system is mainly used for large-scale crushing and screening. The mobile crushing and screening system is flexible and convenient, suitable for multiple scenes of construction waste crushing site.

(2) Dust Control System

During the production process, some of the equipment raises dust seriously, which affects the production and environment, so the dust control system needs to be set up at the dust raising point.

(3) Light matter separation system

In the vibrating screen with a sealed cover using negative pressure, the vibrating screen on the plastic bags, foam and other objects sucked away, there are some small pieces of wood (large pieces of wood also need to be separated manually, such as in more than 1m) mixed in the coarse aggregate, can be in the coarse aggregate of the belt machine at the discharge, add a gravity classification system, through all the materials in the waterfall like in the classifier inside the scattering, through the negative pressure of the wind, can be small gravity Through the negative pressure of the wind, the material with small gravity can be separated into another bin, while the one with large gravity falls into another bin, so as to achieve the purpose of separation.

(4) Iron removal system

There is a considerable part of reinforced concrete in the construction waste, and this part of reinforced concrete will be separated when it is crushed, and the steel is an important economic source in the process of house demolition. Therefore, the addition of iron removal system in the crushing process, which has automatic suction and automatic unloading function, greatly improves the economic value and eliminates the tediousness of manual sorting.

No matter fixed or mobile construction waste crushing and screening plant, the process flow of crushing process is commonly used at present as shown in the figure below:

The construction waste to be treated is disinfected by chlorine dioxide disinfectant → the obtained construction waste is loaded into the hopper → transported to the sorting platform, sorting out waste boards, cardboard boxes and waste paper, waste paint buckets, waste plastic pieces, waste plasterboard and other miscellaneous items → the sorted construction waste is sent to the primary sieve and magnetic separation by vibrating feeder, the large pieces of construction waste flow into the post equipment, and the fine material is used as the final product → the jaw crusher for primary crushing → after the primary crushing by Magnetic separation by magnetic separator and sent to the impact crusher hopper for final crushing → magnetic separation and screening out different particle sizes of crushed materials, sorted and stored for use. The "usable material" is ferrous material, which is returned to the furnace for treatment.

Construction waste should be processed to ensure that the following requirements are met:

(1) In order to ensure the construction period of the construction waste application project, the processing of construction waste must reach the required productivity;

(2) When the construction waste recycled aggregate is used in projects with high standard requirements, the content of soil and the content of needle-shaped particles in the recycled aggregate should be reduced as much as possible;

(3) Producing cubic shaped aggregates that meet the specification size;

(4) The consistency of the properties of the produced recycled aggregates should be ensured to avoid the non-uniformity of the recycled aggregates.

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