Construction waste refers to the collective name of muck, waste concrete, waste masonry and other wastes generated by people in the production activities of construction industry such as demolition, construction, decoration and repair. According to the source classification, construction waste can be divided into engineering slag, decoration waste, demolition waste, engineering mud, etc. According to the composition of components, construction waste can be divided into slag, concrete blocks, crushed stones, bricks, Waste mortar, mud, asphalt block, waste plastic, waste metal, waste bamboo and wood, etc.
As of 2011, China's urban solid domestic solid waste stock has reached 7 billion tons, and the total amount of construction waste can be estimated to be 2.1 billion to 2.8 billion tons, and more than 300 million tons of new construction waste are generated each year. If simple stacking is adopted, the new construction waste disposal will occupy 150 million to 200 million square meters of land every year.
The amount of construction waste in China has accounted for 30% -40% of the total urban waste. Based on the standard of 500-600 tons / 10,000 square meters, by 2020, China will also add about 30 billion square meters of construction area, and the newly generated construction waste will be a shocking figure.
Most of the materials are mainly landfilled with mobile equipment. The main products are low-quality sand and gravel. The environment is seriously polluted during the disposal process. It has not formed a market-recognized business model or received public support.
That is, the disposal is mainly at fixed facilities. The main products are qualified sand and gravel, various bricks, non-load-bearing plates, and inorganic materials. The resource utilization rate is generally below 80%, and the unresourced parts cause serious secondary pollution. The profit model is based on Government subsidies and policy support are the mainstays, and normal operations cannot be performed without subsidies.
That is, the disposal of fixed facilities is the main, and the renewable products are developing in a variety of types, high quality, and high value-added. The resource utilization rate is above 95% on average. The resource process has basically achieved pollutants standards. The profit model can no longer rely on government subsidies. Market-oriented operations.
With the introduction of the Industry 4.0 model, it is also necessary to have a 4.0 stage in the disposal of construction waste. Utilizing the "Internet +" operating model, digital design, digital construction, digital manufacturing, network integration, intelligent production and management, and material technology, energy technology, biotechnology, 3D printing technology are highly integrated with the construction of waste resources Gradually approaching a zero-pollution production model and continuously increasing the added value of recycled products will definitely become an important growth point for the green circular economy.
Shanghai Jianye Heavy Industry Machinery Co., Ltd. has been committed to the research and development of construction waste recycling technology in 2006, and it has been nearly 10 years. In the beginning, Jianye won a bid for Baoshan's dust-free construction waste treatment project. The project was undertaken by Shishiye and mainly provided roadbed materials and cement and asphalt mixtures for Hutai Highway. Since then, it has successively provided equipment and technology for many construction waste treatment projects.
On the one hand, as the concept of environmental protection is gaining popularity, the market for construction waste resources has been repeatedly affirmed and given high expectations by the industry; on the other hand, the solid waste utilization technology owned by the market is not complete, and the added value of recycled products is low. Profit model, and it will cause secondary pollution to the environment, which cannot fundamentally solve the problem of construction waste. In short, the state and industry still have higher expectations and aspirations for the recycling of construction waste. Against this background, China Construction Metallurgical Co., Ltd. and Guoxun Co. reached a strategic cooperation in 2013, and established Guozhen Construction Metallurgical Environmental Protection Equipment Co., Ltd., which specializes in the promotion of construction waste resource recycling technology and concepts. Customers are endless. However, in view of the severe market situation, many users are still on the sidelines and are unwilling to invest in building factories immediately. However, it is gratifying that most visitors to the construction and recycling company's construction waste recycling technology gave a good evaluation and encouraged us to persist.
Although the market is still urgent, the recycling of construction waste will benefit the country and the people, and we are confident that it will bear fruit. In addition, this research and development bears the dream of Jianye for many years. If it is easily abandoned, the spirit of Jianye will be gone. So at the beginning of 2016, the Construction and Metallurgical Company established a new building materials division to increase the promotion of construction waste resources and renewable green building materials. It is believed that after the precipitation, the building materials business department is more fighting spirit, washed away that flashy layer, and left the user with more appropriate services, more complete, efficient and environmentally friendly construction waste resource recycling technology.
In the process of crushing construction waste, because the properties, specific gravity, density, and hardness of various materials are different, the external force (energy consumption) required to crush these materials is also completely different. The previous fragmentation was simply a collision of particles, that is, a point-to-point collision of matter and matter. To achieve the ideal crushing method depends on two aspects: 1. The external force is large enough; 2. The material mass is heavy enough. Therefore, when crushing concrete, this crushing method is fully capable; but when crushing sintered bricks, due to the light weight and small kinetic energy of the sintered bricks, the collision force between the bricks is difficult to crush the bricks to the sand powder state. Traditional crushing is particle crushing.
The lamination regeneration technology uses the different characteristics of various substances to mix the substances together. Through external force (energy consumption), spherical contact occurs between the substances and the layers are extruded layer-by-layer and collide with each other. Multi-angle pressure transmission. High-density, high-hardness materials form a pressure medium. The low-density, low-hardness materials (sintered bricks, cement stones) are crushed to form sand powder; the remaining strong and high-density materials are natural sand and natural stones. Can be well separated and utilized. Laminated recycling technology crushing belongs to group crushing.
The advantages of laminated recycling technology are: 1. low energy consumption; 2. high efficiency; 3. can effectively regenerate the main substances in construction waste into sand powder and increase value.
The deep processing of brick-concrete construction waste highlights the need to solve the uneven moisture content of brick-concrete construction waste and the imbalance of brick-concrete construction waste and concrete construction waste entering the plant. Therefore, “Industrial Construction Waste Disposal System and Process Flow Layout” was specially invented. Its characteristics are crushing-homogenizing air-drying-grinding, entering the construction waste and pretreatment, and then entering the homogenizing air-drying warehouse for air-drying for 15 days. , And then resource processing. The harmless treatment and the resource treatment are disconnected without affecting each other, and the balanced production is completely realized. The traditional construction waste treatment is pile-and-treat. The problems are that the random pile occupies a large area and the composition of the construction waste changes greatly, which is an unfavorable factor for deep processing.
Recycled coarse aggregate (> 50mm)
Recycled coarse aggregate (<50mm)
Recycled fine aggregate (sand)
Recycled fine powder
Regenerated superfine powder
Aerated cement block
|project name||Recycled powder (10,000 tons)||Recycled sand (10,000 tons)||Recycled aggregate (10,000 tons)||Subgrade material (10,000 tons)||Power (KW)||Labor force||Total land area (mu)||Construction period (days)|
|200,000 tons / year project||6||6||6||2||700||8 * 2||10||90|
|500,000 tons / year project||15||15||15||5||1700||12 * 2||30||120|
|1 million tons per year||30||30||30||10||3000||20 * 2||50||180|