Construction Solid Waste Resource Recovery Crushing: Multi-stage Sorting and Recycled Aggregate Quality Control Technology

Construction Solid Waste Resource Recovery Crushing: Multi-stage Sorting and Recycled Aggregate Quality Control Technology

Construction solid waste resource recovery crushing technology is a core link in promoting the recycling of construction waste and realizing "turning waste into treasure." This technology system transforms mixed construction waste into high-quality recycled building materials that meet the requirements of different engineering projects through efficient multi-stage sorting processes and refined recycled aggregate quality control.

Multi-stage sorting is a prerequisite for resource recovery. Construction waste has a complex composition, usually mixed with concrete blocks, bricks, wood, plastics, metals, and other materials. Modern production lines adopt a "crushing-sorting" collaborative process: first, large debris is removed through manual pre-inspection and preliminary screening, followed by primary crushing using a jaw crusher. Subsequently, various physical sorting technologies are comprehensively used, including air separation (separating lightweight plastics and paper), magnetic separation (extracting ferrous metals), and eddy current separation (recovering non-ferrous metals). To address the challenge of separating concrete and bricks, intelligent image recognition sorting or selective crushing technology can be used to significantly improve aggregate purity, creating favorable conditions for subsequent deep processing.

Quality control of recycled aggregates is crucial to their application value. After sorting, the material enters secondary or tertiary crushing (commonly using impact crushers or vertical shaft impact crushers) and multi-stage screening processes to produce recycled aggregates of different particle sizes. Quality control focuses on three core objectives: first, strictly controlling impurity content by optimizing the sorting process to minimize harmful impurities such as wood, plastic, and gypsum; second, optimizing particle shape and gradation by adjusting crushing equipment parameters and screen configuration to reduce needle-like and flaky particles and obtain a good particle size distribution that meets engineering requirements; and third, improving aggregate performance stability by optimizing the crushing process to reduce internal micro-cracks and control high water absorption. Simultaneously, online monitoring and automatic control systems are used to monitor and adjust key indicators in real time to ensure a continuous and stable output of qualified products.

Through the systematic integration of these technologies, construction solid waste can be transformed into recycled materials suitable for diverse applications such as road base layers, concrete admixtures, and environmentally friendly bricks. This not only effectively reduces the consumption of natural resources and the pressure of waste landfill, but also promotes the transformation of the construction industry towards a green, low-carbon, and sustainable circular economy model, with significant environmental, social, and economic benefits.