Normal construction waste treatment requires a whole process. From the collection and transportation of construction waste to the disposal and resource utilization of construction waste and the reprocessing and promotion of the final recycled products, it is a complete industrial chain. Every link is crucial. Reprocessing and sorting can effectively increase the added value of construction waste recycled products, greatly alleviate the supply problem of construction raw materials, and form a closed loop in a certain sense.

Treatment methods for urban construction waste

Step 1. Separate large flexible film materials, large wood materials and special garbage in the raw materials.

Step 2. The loader pours the construction waste into the buffer bucket. The lower part of the buffer bucket is a vibrating feeder, and the material is evenly fed into the bag breaker through the vibrating feeder. At the same time, a spray dust collector is used for dust suppression.

Step 3: Since a large amount of construction waste will be bagged for easy transportation, the bag breaker automatically cuts the nylon bag containing the construction waste to expose the construction waste. The bagged construction waste is sent to the bar screen through the conveyor belt. The conveyor belt is equipped with a weighing sensor, which can continuously weigh the material during the material transportation process.

Step 4: The screening machine divides the material into materials below 5mm and materials above 5mm. The materials above 5mm are sent to the vibrating feeder through the conveyor belt. The sorting table is set on the feeding belt of the jaw crusher. At the same time, an automatic iron removal belt conveyor and a negative pressure specific gravity light material air separator are set to sort and classify large pieces of light materials and long metal strips.

Step 5: The material processed by step 4 enters the jaw crusher, and the crushed material is sent to the primary circular vibrating screen through the conveyor belt. The jaw crusher is equipped with a bag dust removal system for dust suppression.

Step 6: The primary circular vibrating screen screens the material delivered in step 5, separates the powder (fine aggregate) below 5mm from the raw material, and sends the powder (fine aggregate) below 5mm to the powder storage bin through the conveyor belt. The material above 5mm is sent to the flotation system through the conveyor belt.

Step 7: The flotation system mainly removes the light materials that are not suitable for air separation for a second time to ensure that the content of light materials in the aggregate is not more than 1%. The material processed by the flotation machine enters the linear dewatering screen, and the linear dewatering screen controls the moisture content of the aggregate after flotation.

Step 8: The dehydrated material is sent to the brick-concrete sorting system group through the conveyor belt.

Step 9: The soft/hard aggregate sorting system group intelligently sorts the mixed aggregate into soft (brick) aggregate and hard (concrete and tile) aggregate.

Step 10: The sorted brick aggregate is sent to the impact crusher through the conveyor belt, and the crushed brick aggregate is sent to the circular vibrating screen through the conveyor belt. The circular vibrating screen screens the material into three types of aggregates: 0-10mm, 10-25mm, and above 25mm. The three types of aggregates are sorted and sent to the storage bin through the conveyor belt.

Step 11: The sorted hard aggregate is sent to the impact crusher through the conveyor belt, and the crushed hard aggregate is sent to the circular vibrating screen through the conveyor belt. The circular vibrating screen screens the material into three types of aggregates: 0-10mm, 10-25mm, and above 25mm. The three types of aggregates are sorted and sent to the storage bin through the conveyor belt.

The intermediate recycled materials have been prepared and entered the reserve silo, ready to enter the production system of recycled products or ready to be sold.