Mesda Mobile Crushing and Screening Equipment is widely used in the field of construction waste treatment.
The frequent occurrence of environmental pollution events shocked the world has resulted in the emergence of abnormal death, disability and illness of the population. Among them, eight pollution incidents are the most serious, which are called "eight major hazards". The environment on which human beings depend for survival and development has been challenged severely. The rapid development and effective utilization of resources have made it increasingly exhausted and seriously damaged the ecological environment. Environmental problems have become one of the global problems facing human beings today, which has aroused widespread concern in various countries. As a developing country, in recent years, with the intensification of infrastructure construction by the state, the level of urbanization of industrial and civil buildings, mine construction, highway construction and so on has been rapidly developed and constantly improved, but at the same time, China is also facing the big problem of mutual restriction of land, resources, population and environment. Construction waste aggravates the tension of land and resources, which seriously affects the coordinated development of social economy and ecological environment. It is urgent to strengthen the comprehensive utilization of construction waste. Therefore, comprehensive utilization of construction waste must be considered as a major strategy. At the same time of civil engineering construction, we should protect the ecological environment, save land, and deal with the relationship with society and economy, so as to realize the sustainable development of traffic environment.
I.Types and Distribution of Construction Waste
Construction waste refers to sludge, residue, mud and other wastes produced by construction, construction units or individuals in the process of construction, demolition, repair and decoration of various buildings and structures. According to source classification, construction waste can be divided into five categories: land excavation, road excavation, demolition of old buildings, construction and construction materials production waste. According to the nature of construction waste, it can be divided into inert part and non-inert part. With the acceleration of urbanization process, the generation and discharge of construction waste in cities are also growing rapidly. While enjoying urban civilization, people are also suffering from the troubles caused by urban garbage, of which construction garbage accounts for a considerable proportion, accounting for about the total amount of garbage.
II. Present Situation of Construction Waste Treatment in China
For a long time in the past, the construction industry in our country used traditional construction methods, which consumed a lot of raw materials, coupled with backward management, resulting in a large amount of construction waste.Although the development and utilization of new building materials have begun, the scale and quantity are still very limited. Construction waste is widely distributed and varies in scale. With the constant change of construction projects, the generation time of construction waste is uncertain. Although the total amount of waste generated in a relatively long period of time is basically fixed, it can not accurately predict the time and quantity of each construction waste site in advance.
On the one hand, there is a lack of effective management of construction waste. There are still some phenomena of construction waste piled up and dumped in disorder. The construction waste is not dynamically monitored, classified and counted, which leads to insufficient understanding of the production, disposal, backfill and utilization of construction waste. On the other hand, the treatment method is backward, usually without any disposal, it is transported to the suburbs or rural areas, using open-air stacking or landfill to deal with, consuming a lot of construction costs such as land requisition fees, garbage clearance and transportation. At the same time, the dust and fly ash during the cleaning and stacking process have caused serious environmental pollution. In addition, the state has not yet established perfect laws and regulations to prohibit the landfill of available construction waste, stipulating that construction waste must be classified collection and storage. China passed the Law on the Treatment of Municipal Solid Waste in January, requiring the garbage-producing departments to pay garbage treatment fees. However, this charging method can not fundamentally block the source of construction waste, and does not involve the recycling and reuse of construction waste, lack of recycling concept of construction waste, and lack of comprehensive utilization facilities.
III. Use of Construction Waste
Construction waste is not "garbage", but a renewable resource. The main components of construction waste are: soil, dregs, waste reinforcing bars, scrap wire and various scrap steel accessories, scrap metal pipeline scrap, scrap bamboo, wood chips, particles, packaging boxes of various decorative materials, packaging bags, scattered mortar and concrete, broken bricks and concrete blocks, yellow sand, stones and stones scattered during transportation, etc. These materials account for about 80% of the total construction waste. The proportion of garbage is slightly different in construction sites with different structural forms; the level of construction management is different, and the amount of garbage varies greatly. After sorting, removing or crushing, most of the wastes in construction waste can be reused as renewable resources, such as scrap steel bar, scrap iron wire, scrap wire and various scrap steel fittings. After sorting, centralization and re-furnace, they can be processed into various specifications of steel; scrap bamboo and wood can be used for production. Man-made wood; Waste materials such as bricks, stones and concrete can be used instead of sand after crushing, for masonry mortar, plastering mortar, laying concrete cushion, and for building materials such as bricks, paving bricks and plaid bricks; bricks and tiles can be reused after cleaning; waste bricks, tiles and concrete can be broken, screened and cleaned. It can be used as recycled aggregate to prepare low-grade recycled aggregate concrete for foundation reinforcement, road engineering cushion, indoor floor and floor cushion, non-load-bearing concrete hollow block, concrete hollow partition board or autoclaved fly ash brick, etc.
IV. MASTER CONSTRUCTION WASTE TREATMENT PROCESS
MSD Mobile Crusher Construction Waste Treatment Scheme
V. MSDA Construction Waste Treatment Equipment
_At present, China's construction waste disposal is mainly broken and reused. There are usually two kinds of equipment used, one is fixed construction waste disposal equipment, the other is mobile construction waste disposal equipment - Mobile crusher, mobile crusher is divided into tracked mobile crusher and tire mobile crusher according to its movement mode. Crusher and mobile crusher have gradually become the main equipment for construction waste treatment because of their flexibility. In addition, mobile screening stations are generally used to classify and screen the crushed materials of mobile crushers. Mesda Mobile Crushing and Screening Equipment is equipped with special dust removal and noise reduction equipment, which will not pollute the environment in the production process.
MSD Mobile Crusher is Handling Construction Waste
VI. Output and Equipment Operation
The crushing ratio of mobile crusher manufactured by Nanning Meista can be adjusted according to the use of recycled materials, and users can choose the type of mobile crusher according to the demand of production capacity.
MSD Mobile Crusher is Handling Construction Waste
VII. Material of finished products after recycling of construction waste
Construction waste materials after crushing can be divided into 0-4.5 mm, 4.5-10 mm, 10-32 mm and more than 32 mm.
Processing efficiency of MSD mobile crusher
VIII. MSDA Mobile Crusher at Construction Site for Recycling Construction Waste