In the scheme design, Shanghai Shanmei innovatively put forward a reverse resource utilization design concept of “back-end products determine the front-end scheme”. It custom-built an integrated collaborative treatment line for “decoration + demolition waste”, as well as a water-washing crushing sand production line for the project. The project collaboratively processes urban decoration/demolition solid waste with natural and recycled gravel raw materials. It finally produces recycled aggregates of different particle sizes (5–31.5 mm), and further extends to recycled water-stabilized materials and recycled concrete, forming a high-value-added industrial closed loop.
The project boasts numerous outstanding technical highlights:
1. **Screening before crushing to reduce consumption and improve efficiency**: Bar screens and vibrating screens are used to separate soil and fine materials in advance, which effectively reduces invalid work of crushers and significantly lowers equipment wear.
2. **Multi-stage sorting for precise impurity removal**: “Multi-stage air separation + magnetic separation” stations are arranged after primary crushing and secondary crushing respectively to efficiently remove light floating substances and scrap metals and guarantee high quality of recycled aggregates.
3. **Flexible production with dry-wet combination**: For raw materials (dry materials / wet materials) with different moisture and mud content, the production line can flexibly switch between dry and wet processes to save energy consumption and ensure stable all-weather production all year round.
4. **Integration of aggregate, water-stabilized material and commercial concrete**: The project is not limited to crushing and processing. It builds a green building material industrial park integrating aggregate production, commercial concrete and water-stabilized material preparation, greatly improving the resource utilization value.
Environmental Protection and 100% Resource Utilization
The project implements integrated treatment of “dust, sewage and solid waste” throughout the whole process: the crushing and screening section is equipped with negative pressure bag dust removal system; the sand washing line adopts closed-circuit circulation of production water with zero discharge. Meanwhile, magnetic separation and air separation realize precise classification and recovery of metals and light substances to ensure clean production. Ultimately, construction solid waste achieves 100% resource utilization: recycled aggregates are used for building material production, recyclables such as steel bars and plastics are sold externally, light substances can be used for incineration power generation, and muck is used for backfilling or brick making.
Equipment Support and Project Significance
Relying on advanced Sino-German joint venture technology, Shanghai Shanmei provides high-performance equipment for the project, including HC/E-HSI series impact crushers, JC series European jaw crushers, SMW and DAS series air separators, BHFI series belt flotation machines, rotary screens, flip-flow screens, vibrating screens and twin-shaft shredders. As a leading enterprise in China’s solid waste resource utilization industry, Shanmei has served more than 130 projects in over 40 cities nationwide. The Mianyang project is its key layout in Southwest China and another model for practicing the “Zero-Waste City” strategy. In the future, Shanghai Shanmei will continue to drive green development through scientific and technological innovation, contribute professional strength to promote the upgrading of China’s construction solid waste resource utilization industry and achieve the goal of building a Beautiful China.
As a leading enterprise in domestic solid waste treatment and resource utilization, Shanghai Shanmei has served more than 130 projects across many cities and provinces in China. The Mianyang West City Construction Solid Waste Disposal Site Project is an important layout of Shanghai Shanmei in Southwest China and another masterpiece to boost the construction of “Zero-Waste City”. Going forward, adhering to the philosophy of “Scientific and Technological Innovation, Green Development”, it will continue to promote the development of construction solid waste resource utilization industry with advanced technical equipment and mature overall solutions, and contribute more to building a Beautiful China and achieving green, low-carbon and high-quality development.
