Reading Mr. Gao Changming's article "Talking about Japanese Ecological Cement Again" , the article gives a brief overview of the origin, evolution and decline of Japanese ecological cement, reminding the domestic industry not to repeat the same mistakes, revealing the old man's love for the domestic cement industry.
Mr. Gao Changming, as a respected elder in China's cement industry and the first batch of self-trained cement experts in New China, still served as a senior consultant of Danish Smith Company after retirement to contribute to China's cement industry. As a young participant in the environmental transformation of China's cement industry, the author deeply admires and studies Gao Lao's articles repeatedly.
However, as a technician who studies the co-disposal of fly ash in cement kilns, he disagrees with some of Mr. Gao's views and expects to discuss them with experts.
First of all, while refuting the Japanese ecological cement, the article also defines that the cement kiln co-processing fly ash of Liulihe Cement Plant in China is the only authentic "ecological cement". The author agrees with the "only", but if this "ecological cement" is equivalent to the Japanese "ecological cement", I do not agree with it. I dare to ask the old gentleman, how to define "ecological cement"?
According to the definition of raw materials, the raw materials of each ton of ecological cement in Japan contain 0.5t of burned ash, 0.3t of sludge, 0.3t of limestone additive, and 0.85t of cement clinker . However, in China's cement kiln co-processing, the amount of fly ash added after desalination treatment is not more than 5%, and the rest is still traditional cement raw materials, which is obviously not the same.
According to the definition of fired cement, Japan's ecological cement can not meet the national standard of OPC cement JISR5210 in Japan, while the cement produced by China's technology fully meets the national standard of cement products in China. Obviously, the two can not be equated.
Therefore, as a layman in the cement industry, the author believes that the definition of the fly ash disposal system of Liulihe Cement Plant as "ecological cement" is open to question. I wonder if anyone dares to use the "ecological cement" of Liulihe Cement Plant. If the cement market is not good, it is not good for someone to blame the old man.
Secondly, the purpose of the cooperative disposal facility of fly ash in Liulihe Cement Plant is to "fully experience, analyze the advantages and disadvantages, and accumulate experience and lessons for comprehensive and scientific evaluation"? Weakly ask, when to judge, we can solve the problem of fly ash disposal in our country after the judgment.
As early as November 2012, Xie Zhenhua, then deputy director of the National Development and Reform Commission, pointed out: Beijing BBMG Liulihe Cement Co., Ltd. has solved a series of problems that the cement kiln disposal of raw ash has an impact on the cement kiln system and the quality of cement. It is a demonstration line for the disposal of incineration fly ash in China, and has played a positive exemplary role in the coordinated resource treatment of urban waste throughout the country.
In fact, the Liulihe fly ash disposal line has been operating so far, safely, efficiently, and continuously disposing of more than 80000 tons of fly ash, becoming a veritable "Beijing urban security enterprise". A cement plant has solved the problem of fly ash disposal in Beijing.
Such a good effect, such a high efficiency, can not bear the word success? Is it just to experience "ecological cement"?
In addition, as an environmental protection worker, I would like to find fault again. Mr. Gao Lao pointed out in his article that the reason why Japan launched the ecological cement project was that in 1996, Japan had accumulated 10 to 15 million tons of deep-buried fly ash, which "unfortunately" had several pollution leakage accidents "one after another", and "under the pressure of public opinion", the government had to hastily launch the ecological cement project.
How can word "unfortunately" be used for the leakage of deep-buried fly ash? What's more, there are several accidents in succession, which shows that the landfill treatment of fly ash has huge potential safety hazards. It is worth sounding the alarm bell and drawing lessons from it. Every year, 4 million tons of fly ash are still in standardized or non-standard landfill. In the future, nearly 10 million tons of fly ash may need to be disposed of safely every year. Fly ash contains a lot of heavy metals and dioxins. Threatening our soil and groundwater all the time, the leakage of fly ash is not "unfortunate" two words can be easily talked about.
Finally, the author would like to reiterate that what we do is not ecological cement, and the cement we make in the process of co-disposal of fly ash is high-quality cement that meets the national and industrial standards. Our sewage is recycled, and our gas emissions meet the relevant national standards.
It's not that we can't do well what Japan or some countries can't do well. You see, our big plane has gone up to the sky. You see, our space station has traveled in the universe. You see, our optical quantum computer is the first in the world. You see, the situation of waste incineration fly ash disposal in China is becoming more and more serious. You see, our cement kiln co-disposal fly ash technology is the world's leading; You see, the cement we produce is high-quality cement that meets the national standards; you see, such a good technology needs the support of national policies. Our technology is independent research and development, not Japan, not the United States, nor Denmark, sincerely ask Mr. Gao Lao to give affirmation and recommendation to China's cement kiln co-disposal of fly ash technology.
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