China Cement Net released an exclusive commentary on May 9: "Gao Changming talks about Japanese ecological cement again". In this paper, the development of ecological cement in Japan is explained by Gao Changming.
As soon as this article was published, it was immediately hotly discussed by peers. Li Zhongfeng, general manager of Beijing Zhongke Guorun Environmental Protection Technology Co., Ltd., published an article on May 11: Refuting "Talking about Japanese Ecological Cement Again". The words were tearful and complained: "Our technology is independently developed, not from Japan, not from the United States, nor from Denmark. I sincerely urge Mr. Gao Lao to affirm and recommend the technology of co-disposal of fly ash in cement kilns in China.
On the 13th, Gao Changming sent a letter to China Cement Network to talk to Li Zhongfeng. The original text is as follows:
Comrade Li Zhongfeng:
Seeing your refutation of my article, first of all, I accept your criticism and correction. My article does not solemnly and clearly distinguish the similarities and differences between the (fly ash) ecological cement of Liulihe Cement Plant and the Japanese ecological cement, or will cause ambiguity, which is not well considered. I sincerely apologize to the plant! Set the record straight!
What my article does not agree with is mainly the name and marketing methods of Japanese ecological cement, as well as the technical policy of "single one" in Japan at the beginning.
Obviously, these have nothing to do with Liuchang Cement.
It must be emphasized that I have always been positive about the performance and quality of Ryukyu Cement. Please don't put all my comments on Japanese ecological cement on Ryukyu Cement, and don't equate the two in a far-fetched way. This is a serious distortion of my article!
Criticism and correction from all walks of life are welcome, especially from young people!
Gao Changming 2017.05.13
Mr. Gao Changming, as a respected elder in China's cement industry and the first batch of cement experts trained by himself in New China, reveals his love for the domestic cement industry. As we all know, the contention of a hundred schools of thought in academia is the manifestation of ideological progress, and the confrontation of excellent ideas can collide with brilliant sparks and jointly promote the development of the industry to a better and better quality.
At the same time, we praise Mr. Gao Changming and Mr. Li Zhongfeng for their academic spirit of "breaking the casserole to the end".
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The following is the original text of Gao Changming's "Talking about Japanese Ecological Cement Again":
According to a recent media report (China Building Materials News 2017.04.27), ecological cement has been praised as a model of realizing circular economy in building materials products. Indeed, this is a name that is relatively easy to induce mistakes, especially in commercial publicity. Because this beautiful veil of ecological cement still misleads a large number of Chinese people.
The so-called ecological cement is developed by Japan in 1999 and announced its success in 2002, using fly ash from waste incinerators as raw material. However, due to its complex process, normal cement plants need to add a lot of washing and filtering equipment, the manufacturing process is too long, the production capacity is low, and the production efficiency is low, resulting in the production cost as high as 2 to 3 times that of ordinary cement, which is difficult to accept by the market. Fortunately, from the very beginning, the relevant marketing department gave this kind of cement a fashionable and gorgeous name, which is called ecological cement. After entering the market for many years, Japan began to promote it to the international market in 2005. However, it first hit a wall in Europe (I was working in Europe at that time and witnessed many related scenes), and around 2008, it shifted its focus to mainland China. At that time, our country was in the upsurge of green ecology, and ecological cement became a much-told story in the cement industry for a time. Some people blindly flattered it, and many people imitated it, even today. Beginning in 2010, Japan's ecological cement seems to show a glimmer of business opportunities in China.
It took three to four years to hold a series of promotion, exchange, consultation and negotiation activities in several major cities in China. After several ups and downs, because of the high price of patents, licenses, intellectual property rights and other fees, the investment is too expensive, forcing Chinese enterprises with investment tendencies to withdraw one after another after calm thinking and analysis. After going to Europe to promote sales and returning empty-handed, the Japanese side once again returned from China without success. Since then, this ecological cement has never been out of Japan. Five ecological cement plants were put into operation in succession from 2001 to 2006, with a total maximum capacity of only 850,000 tons per year, accounting for about 2% of Japan's total cement output, and were on the verge of closing down in 2014. Because Japan has learned a lesson, it has begun to transfer part of its domestic waste to cement kilns for co-disposal. It is reported that one or two ecological cement plants have stopped production.
China's BBMG Liulihe Cement Plant refers to the idea of Japanese ecological cement, and the cement produced by the complete set of production technology and equipment independently developed has inherited the good name of Japan. In 2015, it became the first ecological cement plant in China and the only authentic ecological cement plant in China so far. The Beijing Municipal Government's waste utilization subsidy to the plant is 1500 yuan per ton of fly ash. The main purpose of building the plant is to fully experience, analyze and study the advantages and disadvantages of this technical route from long-term production practice, so as to accumulate rich first-hand experience and lessons, and make a comprehensive and scientific evaluation of it. Undoubtedly, this is a contribution to China's cement science and technology.
Reflecting on the origin and evolution of ecological cement in Japan, we can see that the project of ecological cement is in such a situation today, mainly because Japan hastily decided to incinerate 100% of the national domestic waste in 1986, and nearly 2500 incinerators of different sizes were built and put into operation in all parts of the country in more than a year. Toxic fly ash of 1 to 1.5 million tons is produced every year, all of which are sealed and buried deeply, thinking that it can be done once and for all. Although waste incineration can be reduced by 95%, 5% of fly ash and slag need to be disposed of strictly. After all, after decades of continuous accumulation, land occupation and hidden risks are also increasing year by year. Facts have proved that this single-handed technical decision is a mistake (Europe is not like this, in the long run, we must avoid or eliminate the hidden dangers of secondary pollution as soon as possible, and we should also pay attention to the need to properly disperse risks, not "put all eggs in one basket").
Ten years later, Japan accumulated 10-15 million tons of fly ash in 1996. Unfortunately, there were several pollution leaks from fly ash landfill sites at that time, and the public's concern about its environmental safety increased. Under the pressure of public opinion, in order to solve the problem of fly ash as soon as possible, the government decision-making department rushed to launch the ecological cement project. This is the result of many failures caused by mistakes in early decision-making and improper handling in later stages, driven by the desire for quick success and instant benefit.
International experience shows that comprehensive and systematic R & D projects such as ecological cement are expected to achieve overall success in technology, economy and commerce in the near future, which is a small probability event. Now eco-cement is basically a technical success, an economic failure and a commercial failure. The overall situation should be normal and beyond reproach. The problem is that its commercial marketing methods are not appropriate, its technical content and publicity content are flashy and exaggerated, its expectations are too high, and its mood is too strong. Unfortunately, after hitting the wall everywhere, the drop is too great to bear, and it is not possible to recover the cost in a hurry. On the contrary, the research and development projects that basically conform to the law of scientific and technological research and development, and whose final results are normal and not very successful, have become a bitter fruit; If the mentality is not correct, it will become more and more bitter, which is also the natural law of development of things.
Now it seems that the initiators of the commercial promotion of ecological cement have been adjusting their mentality for many years, and may be facing the reality and further summing up the experience and lessons. After understanding the whole process of the origin and evolution of ecological cement in Japan, it is believed that the cement industry and the media in China will add a large number of people who know the truth, and at the same time reduce a large number of colleagues and the public who have been misled, so as to draw useful lessons from it. More importantly, it is hoped that China's relevant technological policies, as well as the relevant industries, can seriously study its experience and lessons for our use and draw lessons from them! (See also the 6th edition of China Environment Daily on July 18, 2013. Ecological cement is a bitter fruit.)
The following is the original text of Li Zhongfeng's refutation of "Talking about Japanese Ecological Cement Again":
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 does not agree with some of Mr. Gao's views and hopes 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 cement quality. 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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