How to realize the resource utilization of construction waste?

05/07/2024

The resource utilization of construction and demolition (C&D) waste is first to pretreat the construction waste to meet the requirements of recycling. A large amount of construction waste is pretreated mainly by mechanical sorting, supplemented by manual sorting. The pretreated construction waste can be directly recycled, or can be further processed and utilized as required.

The further process of construction waste is mainly finished by professional equipment, such as crushing and screening equipment.

At present, the widely used construction treatment process is as follows: raw material loading → primary crushing → manual sorting of impurities → automatic sorting of impurities → secondary crushing → screening and removal of impurities → finished aggregate.

After the recycling treatment of construction waste is completed, the amount of waste is reduced, and the harm of construction waste is eliminated to achieve harmless treatment.

On site crushing and sorting of construction waste

It refers to the use of demolished old construction waste and newly built construction waste generated in the process of urban and rural construction to realize on-site screening and crushing through relevant technology, so as to provide raw materials for on-site construction. On the one hand, it reduces the space for stacking garbage and the funds for garbage removal; on the other hand, it reduces the purchase of new materials, and further reduces the project cost.

Impurity removal

The construction waste is fed through an excavator, and the waste is removed and pre-screened by the heavy screening station to screen out 30% of the fine material in the construction waste. At the same time, a manual sorting platform is equipped to sort out lightweight materials such as wood blocks, plastics, and fabrics etc. Large diameter materials that need to be crushed enter a mobile crusher for crushing. The screened soil can be used as greening soil for the landscaping department.

Crushing process

The construction waste is transported to the crusher through a heavy-duty screening machine for crushing. The crushed materials are transported to the returned material screening unit through the main conveyor belt. Materials larger than the screen size are transported to the silo by the return belt conveyor and continue to be crushed by the crusher. Materials smaller than the screen size are transported to the mobile screening equipment by the under-screen belt conveyor.

Screening process

For construction waste screening, we can adopt a mobile screening station with three layers. The crushed materials are transported to the silo of the mobile screening equipment and then fed to the vibrating screen through vibrating feeder for screening process. The screened products can be divided into four types of recycled aggregates that can replace natural sand and gravel, namely 0-5mm, 5-10mm, and 10-31.5mm. If there are different needs, the product particle size can be controlled by changing the screen size. Large particle size aggregates can be mixed with water stable graded crushed stones for use, while small particle size aggregates can be used for deep processing, such as making pedestrian walkway bricks, lawn bricks, etc.

Mobile crusher for construction waste treatment

Crushing and screening equipment is the key to the recycling of construction and demolition waste. For construction waste treatment, Liming recommends mobile crusher. Here are the reasons why mobile crusher is the ideal choice:

The use of construction waste has undergone great changes in the past half century. From being simply used for garbage dumping and landfilling, to partially recycled for building backfill, park foundation construction, and road reclamation, to today's processing and reuse as building aggregates. The recycling rate of construction waste is getting higher and higher, and the added value of its reprocessed products is also getting higher and higher.

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