After a series of processing procedures such as mixing, metering, crushing and stewing, the residual mud and dregs produced by mining have achieved "qualitative change" and become "hard lumps" of small particles for road construction.
On September 26, the first green zero-discharge sludge recycling production line in China was completed and put into operation in Xiaoaoshan Mining Area, Huangjiabu Town, Yuyao, under Ningbo Traffic Engineering Construction Group Co., Ltd. This shows that Ningbo is in the forefront of its counterparts in the country in solving the problem of mine residual mud and soil absorption in the mining process and reducing the adverse impact of mine residual mud and soil discharge on the environment.
With the continuous advancement of urbanization, the problem of how to effectively dispose of a large number of construction dregs and mud produced by various engineering projects has become increasingly prominent.
Relevant data show that in 2022, 63.12 million tons of engineering dregs were approved in the central urban area of Ningbo, and the pressure of terminal disposal and resource utilization is increasing year by year. Whether it is landfill, foundation backfilling or dumping of mountain ponds, it is easy to cause secondary pollution and other problems. In November
2022, the World Forum on Science and Technology and Development put forward that one of the top ten scientific issues of the year is "sustainable urban development", the core of which is "how to build a green and efficient reuse system of urban waste resources".
In view of the social pain point that Ningbo's construction engineering dregs, waste mud and mine residue are difficult to deal with, Ningbo Traffic Engineering Construction Group Co., Ltd. The exploration of such topics as "Research on Complete Set of Technologies for Resource Utilization of Waste Mud and Drilling Residue in Expressway" and "Development of Key Technologies and Equipment for Harmless Treatment and Resource Utilization of Construction Engineering Residue and Mud" has been carried out, and has been included in one of the major special topics of "Science and Technology Innovation 2025" in Ningbo City. Song Bingquan, chief engineer of the
recycled material pressure test
group, said that in view of the characteristics of dregs and mud in Ningbo soft soil area, after several years of tackling key problems, they developed a suitable curing agent for environmental protection, economy and high efficiency, and developed a complete set of technologies for comprehensive utilization and efficient treatment of resources. Through the treatment technology of physicochemical combination, the large-scale and efficient comprehensive treatment of residual mud and soil can be realized, and the residual mud and soil can be transformed into high-quality filling materials for light embankment of high-grade roads in soft soil areas, which can effectively reduce the additional stress and post-construction settlement of subgrade.
At present, this innovative resource reuse technology has achieved large-scale production and achieved remarkable results: 4 complete technologies and related products for harmless treatment and resource utilization of construction engineering dregs and mud have been developed, about 20 patents have been applied for, 3 technical standards have been formed, 23 papers have been published, and 2 production lines have been built.
Put the "mud cake" into the processing line
. The newly built automatic production line for resource utilization of mine residual mud in Xiaolaoshan mining area of Ningbo covers an area of 6200 square meters, with a total processing capacity of not less than 1200 tons per day. At present, it can process 250000 tons of residual mud and soil for Xiaolaoshan mining area every year. If it is running at full capacity, the production line can handle 500000 tons of residual mud and soil annually. Reporters at the scene saw that the mine residue was first made into filter cake, then processed through the production line, and finally transformed into a new type of green building materials for paving roads.
"This treated recycled material is much harder than ordinary gravel and is very suitable for use as a base material for road building." Song Bingquan calculated that it would cost nearly 100 yuan to transport and dispose of the residual mud and dregs from one side of the mine. On the other hand, the construction unit needed to buy ore aggregates and dregs for road building, which cost more than 80 yuan per side. Now, with the support of recycling technology, the mine residual mud and soil can be "turned into material" on the spot, which not only greatly saves the construction cost, but also solves the environmental pollution problems caused by the previous residual mud and soil absorption and disorderly stacking, with many benefits. It is reported that Jiaogong Group has used about 400000 square meters of this kind of reused dregs in the construction of auxiliary roads and surrounding roads in the first phase of Hangzhou-Ningbo double-track project before, and the effect is very good. Zhang Xudong, secretary and general manager of the Party Committee of
Ningbo Jiaogong Group, said that Jiaogong Group would continue to make innovative explorations in the four aspects of "technology, standards, models and industries" in the research and development of resource regeneration and industrial application, so as to provide solutions for the resource utilization of construction dregs and engineering mud in the whole city. Help Ningbo to build a "waste-free city".
According to expert estimates, if the results of the project are extended to other construction projects in Ningbo, according to the realization of 50% -60% of the resource utilization of construction dregs and mud, the city is expected to produce about 30 million tons of renewable resources per year, with a saving of 30 yuan per ton, the annual cost of construction projects can be saved by nearly 900 million yuan. It will produce huge economic benefits and good social benefits.
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