It is imperative to control the environmental hazards of construction waste; more than 95% of construction waste after resource treatment can become raw materials for engineering construction, which can fully replace non renewable natural sand and other resources
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03 project construction scale construction scale is based on the output of construction waste and the scheme of recycled products, combined with process technology, raw materials and energy supply, cooperation, project investment and financing, scale economy and other factors
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05 stacking area analysis stacking area is one of the necessary facilities of construction waste resource treatment plant, which is mainly used to adjust the supply and demand balance between construction waste output, construction waste treatment capacity and recycled product aggregate consumption
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09 crushing and screening equipment analysis the common crushing equipment of construction waste include jaw crusher, impact crusher, cone crusher, vertical shaft impact crusher, etc
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In process selection, we should pay attention to the overall optimization, not just the pursuit of the optimization of a certain link
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Site selection is to select the construction site and address according to the requirements of regional planning and urban planning, combined with the nature, function and condition of the proposed project
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Among them, manual separation, magnetic separation and air separation are the necessary steps
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The auxiliary project outside the plant refers to seven connections and one leveling, so as to meet the conditions of water supply, drainage, electricity, access, communication, heating, natural gas or gas and site leveling
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in addition, roller crusher and ball mill are also used
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The regional factors affecting the project location are as follows: (1) natural factors; (2) transportation factors; (3) market factors; (4) labor factors; (5) policy factors; (6) aggregation factors, etc
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The main advantages of first breaking and then stacking: reduce the damage of large materials to subsequent equipment, especially the conveyor belt, reduce the complexity of subsequent unit processing, the broken aggregate composition is relatively pure, and the organized stacking is adopted to reduce the impact of aggregate composition fluctuation on the quality of recycled products, and at the same time, less secondary transportation
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06 process plan construction waste treatment process is usually determined by analysis and comparison according to the composition of construction waste, source waste classification, requirements of recycled products for aggregate, pollutant emission standards and other social and economic conditions
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08 construction waste treatment process analysis the core process of construction waste disposal is the crushing process, and the crushing stage is determined by the particle size and shape of recycled aggregate
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In addition, when the project site has higher requirements for environmental protection emission standards (such as Beijing environmental protection requires that the emission dust management standard from the exhaust outlet should not exceed 10mg / m3), the combination of air separation and flotation is often used It’s the same
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Construction waste has obvious characteristics of regionality and composition complexity
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Therefore, it is very important to reasonably predict the production scale of construction waste
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Each crushing and screening equipment has its own scope of application and should be selected flexibly
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How to correctly select high value-added and market potential recycling products in combination with the local actual situation is the key factor for the normal operation and economic benefits of the construction waste recycling project
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The following factors should be considered: (1) the impact of construction waste output on the handling of the regulation; (2) the impact of market demand on the scale of regenerated products; (3) resource supply and other external construction conditions; (4) the advanced nature and production of production technology and equipment: (5) environmental capacity; (6) social factors and policies and regulations; and (7) industry factors
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01 prediction of construction waste output at present, due to the large prediction scale of some cities, the completed projects can not give full play to their benefits; and due to the lagging prediction scale of some projects, the output is greater than the treatment capacity, resulting in the low treatment rate of construction waste
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The main disadvantages of stacking before breaking are unorganized stacking, large floor area and secondary transportation; in contrast, the method of stacking after breaking has many advantages and strong practicability
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The common screening equipment of construction waste includes vibrating screen, roller screen, bar screen, etc
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The following factors should be considered in the selection of renewable products: (1) market demand of renewable products; (2) national industrial policy and enterprise development strategy; (3) specialized cooperation; (4) comprehensive utilization of resources; (5) environmental constraints; (6) supply of raw materials and fuel; (7) technical equipment conditions; (8) requirements of production, transportation, packaging, storage and other conditions
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This paper shares the key points of the design of the construction waste recycling treatment project, including the output and composition of construction waste, renewable product scheme, construction scale, site selection, process flow, crushing and screening equipment configuration, sorting method, etc
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If any link is not fully considered, it is difficult to achieve the desired effect after the completion of the project, so it still needs a professional evaluation and design team
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The factors affecting the prediction of construction waste production are: (1) the comprehensiveness and accuracy of the basic data of construction waste within the effective transportation distance; (2) the scientificity of the prediction method of construction waste production
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On September 1, 2020, the new solid waste law will come into effect
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At present, the common application directions of recycled product scheme are recycled concrete hollow block, recycled pavement permeable brick, recycled standard brick, recycled road material, recycled aggregate, recycled ready mixed mortar, recycled powder and other recycled products
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Usually, crushing is followed by screening
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Site selection site selection is not only related to the investment and speed of facility construction, but also to a large extent determines the cost of products and services provided, thus affecting the production management activities and economic benefits of enterprises
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The setting of stacking area is generally divided into two forms: stacking before breaking and stacking after breaking
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The main separation methods of construction waste are manual separation, magnetic separation, air separation, flotation, etc
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Specifically, when it is mainly used to produce 50 mm ~ 100 mm coarse orthopedics, single-stage jaw crusher is mostly used; when it is mainly used to produce 37.5 mm ~ 50 mm aggregate, secondary crushing is mostly used; when it is mainly used to produce 4.75 mm ~ 37.5 mm aggregate, secondary crushing or tertiary crushing with circulation is mostly used; when it is used to produce 0 mm ~ 4.75 mm aggregate, secondary crushing and primary grinding (coarse grinding) are mostly used The combined process of secondary crushing and secondary grinding (coarse grinding and fine grinding) is mostly used in the production of 300 to 3000 mesh recycled powder
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07 supporting works scheme supporting works refer to public works, auxiliary works and off-site supporting works
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Public and auxiliary works generally include: Electrical Engineering, instrument and automatic control engineering, water supply and drainage engineering, HVAC engineering, environmental protection engineering, fire engineering, analysis and testing, machine maintenance and storage facilities, etc
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These attributes determine the diversity of technology options in Governance Space and the dependence on the overall technology integration rather than single technology in governance effectiveness
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Construction waste resource treatment project involves a lot of details, this paper only mentioned some matters needing attention
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The selection of crushing and screening equipment should be determined according to the requirements of material composition and aggregate properties
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In most cases, the flotation method is used in combination with other separation methods, which is mainly used in the occasions with higher requirements for the purity of aggregate
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