We will improve the level of technology and equipment to facilitate the hierarchical utilization of construction waste resources.
The reusability of construction waste is well known. However, there are still many drawbacks to the utilization of construction waste resources and recycled aggregate:
1. The composition is complex
When construction waste is processed into recycled aggregate, inorganic materials such as concrete, ceramics, glass, and bricks become "escaped fish" and penetrate into the finished materials, affecting the overall performance of recycled aggregate.
2. Particle surface rough
The surface of recycled aggregate particles is mostly attached to the secondary particles of waste mortar, and a small part is the original particles and waste mortar particles completely separated from the waste mortar.
3. Low packing density and apparent density
The porosity of recycled aggregate cement mortar is large, coupled with a large number of cracks in the interior when broken, so its bulk density and apparent density are relatively low.
4. High crushing index
It fluctuates greatly with the strength of raw materials. Its characteristics are closely related to the parent concrete, composition, strength, processing, crushing method, and crushing index.
5. High water absorption rate
The content of cement mortar in the recycled aggregate is high, and after the equipment is broken, there is certain damage, the surface is much rougher than the natural aggregate, and the water absorption rate is relatively large.
In view of the drawbacks of recycled aggregate, Qunfeng Heavy Industry believes that it is the top priority to do a good job in the classification of construction waste, and improve the processing technology and equipment level, so as to realize the classification and utilization of construction waste resources.
1. Do a good job of classification
Foreign buildings are more classified as demolition, construction waste in steel, wood, and plastic and other impurities are relatively less. When the domestic building is demolished, various impurities and even household waste are mixed in it, and the composition is complex. This requires classification to improve the purity of recycled aggregate.
Qunfeng Heavy Industry's construction waste resource treatment solution is designed with a pre-sorting treatment line, picking up the table, etc., so that the construction waste can be basically classified before formally entering the crushing link, the source of impurity removal, and the purity and economic added value of recycled aggregate can be improved.
2. Improve the level of treatment technology
Traditional mechanical sieving methods of recycled aggregates are often mixed with red brick, tile, wood, plastic, and other debris, which do not accord with standards, the production of recycled concrete has clearly has a high economic value of recycled aggregates, but because of the high rate of impurity and can not sell a good price, greatly dampened the initiative construction waste treatment unit of production.
Peaks heavy industry in a different part of the recycling of the construction waste crushing, magnetic separation, screening, has been designed reasonably lightweight material separation, artificial collecting process line, the construction waste recycling processing technological level to a new height, pull to lightweight in construction of mixed waste material, black metal, other stuff (non-ferrous metal, cable, wood, etc.) for separation, Then the concrete blocks, waste bricks, stones, etc. are crushed and screened. This can not only produce recycled aggregate with high cleanliness, but also increase the recycling proportion of materials such as metals and fuel, and indeed improve the resource utilization rate of construction waste.
Effective treatment of sieved fine-grained materials can further reduce the amount of waste entering landfills. The fine material under the roller screen contains some inert substances, such as stone, concrete, glass, and soil, which also contains fiber products, films, plastics, wood, and textiles. These lighter non-inert particles can be effectively separated from inert materials by using the latest sorting systems and relaxation screens.
Inert material will be effectively sieved and thoroughly divided into different sizes, and inert material can be used as refuse Derived FUEL (RDF).
3. Upgrade equipment level
With good equipment, the recycled aggregate with good gradation can be obtained to enhance the application value.
Qunfeng Heavy industry multistage composite screens can be screened twice in one operation. The equipment can screen the untreated garbage, and at the same time through the underlying relaxation screen, to provide excellent coarse separation function for materials that are difficult to screen.
Key Highlights:
ㆍReduce screen blockage;
ㆍ10 % faster than other tension screening;
ㆍCombined with a unique stepped screen plate and innovative multistage composite screening technology;
ㆍNot affected by the weather, the operator can complete the strict material screening task in any weather environment;
ㆍAn intelligent modular roof system can quickly and easily install a variety of different types;
ㆍBolt-free bottom screen can be quickly replaced;
ㆍWith the modular design, the top screen can be quickly and easily replaced;
ㆍThe dead space at the feed rack and the top screen beam is reduced to maximize the screen area.
Recycled aggregate is an important product of construction waste resource treatment and also an important content for promoting urban sustainable development. In the future, Qunfeng Heavy Industry will continue to study new technologies and equipment for the utilization of construction and waste resources, improve the quality and utilization rate of recycled finished materials, and contribute to the development of the comprehensive utilization of construction waste industry, improve the living environment, promote urban economic circulation and ecological civilization construction.
