The ammonium phosphate "slurry method" has been backed up for 27 years. At the beginning of this year, the international phosphate fertilizer market experienced unusually high prices. In stark contrast to this, China's high-concentration phosphate fertilizer prices have maintained a relatively low price. This should be attributed to the rapid development of domestic high phosphate fertilizer industry in the past decade or so. According to the China Phosphate Fertilizer Industry Association, the total phosphate fertilizer production this year will reach around 13 million tons, which will account for 70% of the total output. China's phosphate fertilizer production can basically meet the needs of the domestic market.
In the history of the development of China's phosphate fertilizer industry, the “New Technology of Ammonium Phosphate Production by Slurry Concentration Method†(hereinafter referred to as “Slurry Lawâ€) developed by Professor Zhong Benhe of Sichuan University is absolutely worthwhile for independent innovation by the Chinese people. The process, which uses medium-grade phosphate rock for the direct production of monoammonium phosphate, provides a strong raw material support for the rapid development of the compound fertilizer industry. At the same time, monoammonium phosphate is also suitable for high nitrogen and low phosphorus soil characteristics in China.
Birth and growth of the "slurry method": The development of a single seed in a 27-year-old forest "slurry" process is the product of a reverse thinking. The original traditional process has been concentrating phosphoric acid in various ways, and there have been countless twists and turns. Traditional techniques require high quality of phosphate ore. The vast majority of domestic phosphate rock is a refractory phosphate rock with high impurity content, which is difficult to directly use to produce high-concentration phosphate fertilizer. For this reason, many technical workers have racked their brains and failed to industrialize.
At the beginning of the 1980s, Prof. Zhong Benhe, who was in charge of the process research, was struggling to read the literature on the production of high-level phosphate fertilizers from the then Soviet Union. Her brain. This sentence is: concentrated ammonium phosphate slurry easier than the concentration of phosphoric acid. But how to do it, there are no words in the literature.
However, this sentence eventually became the original seed of the "slurry method", and after a series of solid scientific research workers applying scientific research, application and promotion of the "slurry method", after 27 years of sunshine, rain, and wind. Blowing rain, it finally became a forest. This forest is still constantly bred and expanded.
The "slurry process" process technology has undergone roughly three stages from the development, the completeness of the industrial installations, to the formation of high-level, large-scale domestically produced devices. Three consecutive jumps have enabled this process technology to leap onto the high ground of China's development of a high concentration of phosphate and compound fertilizer industry.
Before 1988 was the first stage, which was the theory to the pilot process. Sichuan University and Yinshan Phosphate Fertilizer Plant in Sichuan Province jointly carried out research on the development of the "Slurry Method" laboratory and the scale of intermediate tests. This stage established the theoretical basis of the core part of the "slurry law" and preliminary opened the process in the intermediate experiment. The preliminary basic research and 4,000 tons of scale pilot test results won the National Science and Technology Progress Award in 1988.
From 1988 to 1999 was the second stage, which was the process of industrialization of "slurry law." The most noteworthy are: National key industrial test for ammonium sulfate with an annual output of 30,000 tons, and the completion of large-scale and localized projects for the “Eighth Five Year Plan†and “Ninth Five Year Planâ€. In the meantime, the masterpieces are: Relying on the 60,000-ton “slurry method†ammonium phosphate plant of Sichuan Sulfate Plant and the original 30,000-ton ammonium phosphate plant of Chongqing Fuling Chemical Company, the key technologies and equipment for large-scale research will be tackled. The scale of the slurry method has been expanded to 120,000 tons, and it has been named by the State Development Planning Commission as one of the five major achievements in the “Eighth Five Year Plan†of the country.
From 1999 to the present, it is the third stage, and the large scale and localization of the device have been promoted in large areas. During this period, a large number of small and medium sized ammonium phosphate enterprises achieved a doubling of production capacity by integrating various technological achievements of the “slurry law†and only investing a small amount of funds. Some excellent companies currently active in the phosphate fertilizer industry benefit from the application of this process, such as Chongqing Win-win, Guizhou Hongfu, Hubei Xiangyun and Yihua, among others. At present, Hongfu’s “slurry method†phosphate rock localization unit is 200,000 tons/year and 240,000 tons/year, Yunnan Furui 300,000 tons/year, and Sinochem’s phosphorous is 200,000 tons/year. Yihua (Chuxing) is 200,000 tons, all using local colloidal phosphate rock, with a total investment of less than 60 million yuan, and also includes the extraction of phosphoric acid systems.
The achievements and contributions of the “slurry methodâ€: from the theory to the application, a chain of interlocking observations observes the research and application of this process, and we can clearly see a chain of interlocking growth. We can determine 1999 as a watershed for the "slurry law." Prior to this, this technology was in the period of winning prizes and successively won the first prize for scientific and technological progress at the national, provincial, and chemical departments. After this, it entered a period of comprehensive promotion and application. In 2003, the Phosphate Fertilizer Industry Association made a statistics. At that time, there were 22 sets of large-to-medium-sized slurry ammonium conversion or new installations. By the end of 2006, the Phosphate Fertilizer Industry Association confirmed that at the time nearly 7 million tons of monoammonium phosphate (in-kind) products were used in most of the country. The prizes for this process since then are almost always due to its constant application in the practice.
Among the prizes awarded at the various levels, Professor Zhong Benhe who presides over the “Slurry Method†research has a lot of emphasis on such a prize: National Key Industrial Pilot Project for Annual Production of 30,000 Tons of Ammonium Slurry by the State Planning Commission The evaluation was "one of the best projects completed in 100 industrialized pilot projects." The reason why this prize is valued is because it fully affirms the great transcendence of technology from theoretical research to practical application.
—— According to statistics, the state has invested more than 13 million yuan in scientific research funds for this process. This process has been promoted in the phosphate fertilizer industry for more than 20 years and has become almost the best process technology for the production of monoammonium phosphate. According to the statistics of the Phosphate Fertilizer Industry Association, in 2006, the monoammonium phosphate produced by this process together with a small amount of diammonium phosphate (in kind) was close to 7 million tons, and the output value reached more than 9 billion yuan.
There is such a piece of information that can explain the problem: In the fall of 2003, there were statistics on the economics of applying the “slurry method†device. Only six enterprises in Chongqing, Fuling, Hubei Xiangyun, Yihua, and Guizhou Hongfu issued it in written form. Statistics on economic benefits from January to August 2003 showed that 6 companies produced more than 800,000 tons of ammonium phosphate, the output value exceeded 1 billion yuan, and the profits and taxes exceeded 150 million yuan.
I. Economic benefits (based on MAP production in 2005):
(1) Production value MAP production value table
Output Market value Output value (10,000 tons) (10,000 yuan/ton) (100 million yuan)
552 0.18 99.36
552 0.17 93.84
According to the 2005 data statistics of the Phosphate Fertilizer Association, a total of 5.52 million tons of ammonium phosphate was produced. According to the market price of 0.18 million yuan per ton in January 2007, the output value was 9.936 billion yuan, and the lowest value of the market was 0.17 million yuan per ton, with an output value of 9.384 billion yuan.
(2) Profit MAP Profit Statement Output Profit Total Profit (10 thousand tons) (yuan/ton) (100 million yuan)
552 200 11.04
552 300 16.56
552 400 22.08
According to the profit of 200 yuan per ton, the profit is 1.104 billion yuan; if the profit is 300 yuan per ton, the profit is 1.656 billion yuan; if the profit is 400 yuan per ton, the profit is 2.208 billion yuan.
- According to calculations by agricultural experts, the production of ammonium phosphate per ton was calculated at 3 tons, when ammonium phosphate and grain prices were 0.17 million yuan/ton and 0.15 million yuan/ton respectively, and the profit from agricultural revenue was 15.454 billion yuan; when ammonium phosphate and grain prices were used They were RMB 0.17 million per ton and RMB 0.18 per ton, and agricultural profits increased by RMB 20.424 billion; when ammonium phosphate and grain prices were RMB 0.18 million per ton and RMB 0.15 million per ton respectively, agricultural profits increased by RMB 14.904 billion. When ammonium phosphate and grain prices were 0.18 million yuan/ton and 0.18 yuan/ton, respectively, agricultural profits increased by 19.872 billion yuan.
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