China Building Materials News

In recent years, Qingdao Grace Road Environmental Protection Co., Ltd. (hereinafter referred to as Qingdao Grace Road) has gradually entered the public eye with its unique advantages in industrial waste and construction waste recycling. They turned "solid waste mountains" into treasures, not only paving the way for the recycling of solid wastes, but also making a strong contribution to the construction of lucid waters and lush mountains.

The "two gaps" in the face of waste recycling

There is a lot of "money" hidden in the garbage around us.

In addition to domestic garbage, there are many garbage that we don't usually pay attention to, such as industrial waste and construction waste, which are generated in our lives and are associated with urban development.

At present, the annual output of construction waste in my country, including construction waste and engineering spoil, is about 3.5 billion tons, of which 1.5 billion tons of construction waste are generated every year only from demolition. my country's construction waste is generally disposed of by stacking and burying, and the comprehensive utilization rate is less than 5%, which is far lower than that of developed countries and regions such as the European Union (90%), Japan (97%) and South Korea (97%). In 2016, the output of general industrial solid waste in my country was 3.092 billion tons. By the end of 2017, the average annual growth rate was more than 10%, and the resource utilization rate was less than 50%. According to relevant materials, every 1.5 million tons of construction waste recycled can replace 1.2 million tons of natural stone, generating about 60 million yuan.

Garbage doesn't exist now. Over the years, hasn't anyone discovered the economic value hidden in garbage?

Of course there is. But the reality is that although the economic value of it has been discovered, it has not been able to comprehensively utilize the garbage, and the consumption and reuse of solid waste have not achieved the desired effect.

Why? Because there are technical barriers to the comprehensive utilization of waste. There are two main problems. One is that there are many types of garbage, and each type of garbage has its own characteristics. It is a problem to reuse these garbage. For example, many industrial wastes are different from construction wastes. Among industrial wastes, terracotta and steel slag think The way to reuse it is also very different. Maybe you can solve the problem of domestic waste utilization, but you can’t handle construction waste, or you can deal with construction waste, but terracotta and steel slag are still a headache. It is very difficult, and it takes time and technology to overcome these rubbish barriers. The second point is the utilization rate of each type of garbage, that is to say, if the garbage is given to you, can you "eat it up and squeeze it clean"? If you only use a part of the garbage, it is undoubtedly a waste of resources.

Is there a good solution to the above problem now?

"We're not good at 'eating wool', but we're specializing in 'eating rubbish'"

Back in September 2016, Jiuyuan District, Baotou City, Inner Mongolia, is different from the prosperous grassland where "the wind blows the grass and sees the cows and sheep low" in people's impressions. There are "mountainous" black solids piled up here, with several rolling hills. .

Baotou is the largest industrial city in Inner Mongolia Autonomous Region and an important basic industrial base of the country. It is rich in mineral resources and contains 54 kinds of metals, non-metals and energy and chemical raw materials such as rare earth, iron, aluminum, gold, niobium and coal. City".

But the black solids piled up here are not mineral resources such as coal, but waste slag.

Since the reform and opening up, Baotou's economic construction has entered a period of sustained and rapid development. In recent years, large-scale smelting enterprises such as Shenhua, Mingtuo, and Huadian have landed. Just like people's "exploitation of the old and the new", in the production process of these large-scale smelting enterprises, as the smelting products are released, a huge amount of waste - smelting slag is continuously produced.

The piles of piles like hills and mountains are the smelting slag produced by large enterprises such as Shenhua, Mingtuo, and Huadian.

The problem of smelting slag was not a big problem in the early stage of urban development. With the passage of time, smelting slag has gradually become a "stumbling block" for the economic development of Baotou City. a puzzle.

After various investigations, the Jiuyuan Municipal Government learned that Qingdao Grace Road Environmental Protection Co., Ltd. (hereinafter referred to as Qingdao Grace Road) has the ability to solve this problem, and then sent an invitation to discuss solutions to the problem.

The work team of Qingdao Grace Road did not hesitate and left for Baotou after receiving the invitation.

The work team first settled in Baotou City, but companies such as Shenhua, Mingtuo, and Huadian are far away from the city, and the daily round-trip time is expensive. In order to solve the problem more efficiently, the team of Qingdao Grace Road chose to rent farm houses in the villages next to the three companies. The stay lasted for 7 months. From the hot summer to the severe cold during the project construction, Qingdao Grace The road team has completed wasteland reclamation, coordinated waste slag and other work, and finally paved the road running through the three factories with the smelting slag from the three factories.

"I still remember that the tenants next to the farm house we rented live by herding sheep. We often cook and eat in time to catch up with the sheep's circle. During that time, our team's meals often consisted of fried vegetables and wool. It was also mixed with the smell of soil and mutton. The food was really hard to swallow. Now I can still remember that scene when I saw the mutton. Fortunately, we persevered and all the efforts were worth it. It turned out that we 'eat wool' No, but we are professional in 'eating rubbish'," said a technician from Qingdao Grace Road.

It was in such an environment that the work team of Qingdao Grace Road, after 7 months of coordinated efforts, finally got everything ready. In just one day of construction, the smelting slag was converted into materials that can be paved, and the road was completed. layout.

This test road, which uses a large amount of smelting slag and a small amount of "environmentally friendly coagulant" mixture, is directly paved and formed by rolling. Under the circumstance, it has achieved the excellent effect of no collapse, no cracking, no stagnant water in summer, and snow in winter. After testing by the National Testing Center of Inner Mongolia Autonomous Region, building materials and roads made of industrial wastes such as smelting slag and gasification slag have physical indicators such as leachables, radioactivity and strength that have reached or exceeded national standards, and have low cost, solid The amount of waste added has reached a world-leading level of 91.6%.

This is a glimpse of the project of Qingdao Grace Road in Jiuyuan District, Baotou, Inner Mongolia.

Master core technology and form a complete technology system

In addition to using industrial waste construction waste to produce road paving materials, Qingdao Grace Road can also use industrial waste construction waste to produce high-end sponge bricks, etc. Compared with similar products, it not only has high water permeability, but also water retention and frost resistance Melting, high strength, long life, and low price, it is a green building material product that can meet the needs of large-area permeable pavement for sponge city construction.

With such a variety of waste residues and such a high utilization rate, how did Qingdao Grace Road achieve it?

In fact, Qingdao Grace Road has been concentrating on research and development for more than ten years for this technology, and the key to all this lies in the "environmentally friendly coagulant". The research and development of "coagulant" is the result of the joint research and development of Qingdao Grace Road and the scientific research team of Yale University in the United States. .

The China Academy of Building Materials Research conducted an analysis on the solidification mechanism of the solidified raw material core samples of Grace Road's "environmentally friendly coagulant", and found that its solidification effect on raw materials is a comprehensive behavior, including physical adsorption, entanglement and chemical reaction. The coagulation effect produced by the mixed raw materials is very effective, has excellent strength and water stability, and also has good freeze-thaw resistance. Whether it is soil, sand (sand) stone, stone powder, or slag, tailings powder, weathered stone, mountain spleen soil, domestic waste incineration slag, construction waste, fly ash, coal gangue, river and lake municipal sludge, glass powder, etc. , and even high-risk chemical waste residues, only need to add 0.2% "environmentally friendly coagulant" to "turn waste into treasure", avoid burning into green building materials products, build roads and pave roads. And 91.6% of the solid waste mixing amount has broken the current industry record and has become an innovative technology for solid waste recycling with the world's advanced level.

In addition, in order to better realize the utilization of solid waste, the high-efficiency new mixer developed by Qingdao Grace Road has won a number of international patents for its superior performance. It is understood that the mixture takes only 3.7 seconds to stir from the inlet to the outlet of the mixer, and the uniformity of the mixture is nearly 100% qualified.

With "core technology" in hand, Qingdao Grace Road has gradually formed a complete technical system. In recent years, it has been successively used in highways, road paving, ecological ridge paving, ecological farmland waterway paving, solid waste recycling and reuse type construction and paving, and ecological soil environmental protection bricks, river cleaning and recycling bricks, and solid waste recycling. A complete technical system has been formed in the fields of reuse of environmentally friendly bricks, desert treatment and recycling and construction, and has passed ISO9001 quality management system, ISO4001 environmental management system, and OHSAS18001 occupational health and safety system certification. The products produced have been tested by authoritative testing units, and have obtained the ten-ring certification of China's environmental label, the EU CE safety certification, the EU Rohs environmental protection certification, the US UL safety and environmental protection certification, and the US FCC quality standard certification. After testing by domestic authoritative institutions, all products meet and exceed national standards. "Environmental coagulant" was awarded the "National Key New Product Certificate" by the Ministry of Science and Technology in 2016, and environmentally friendly brick series products were selected as "China's Independent Innovation Products". The Quality and Technical Supervision Center and the National Federation of High-quality Brand Strategy Promotion have awarded the titles of "China Energy Conservation and Environmental Protection Products" and "International Famous Brands". The field of waste treatment has had a huge impact.

With its achievements in the field of industrial waste and construction waste recycling, Qingdao Grace Road has successively become strategic partners with Venice Hotel Group, Morgan Stanley, Goldman Sachs Group and other international companies. In the past two years, domestic partners and agent teams It has also begun to take shape, and Qingdao Grace Road will provide it with technical support.

It is understood that "environmentally friendly coagulants" and green building materials and paving technology have been applied or will be applied in Shenzhen, Zhuhai, Singapore, Malaysia, Australia and other engineering projects.