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Regarding the starting point for the development of this technology, Zhong Ben disclosed that 80% of China’s phosphate ore is currently processed into phosphate fertilizer, which is used to produce fine chemical products. Therefore, the development of high-value-added phosphorus chemical products is to increase the economic efficiency of enterprises. The main way out. At the same time, the application prospects of industrial-grade, food-grade, and electronic-grade phosphorus chemical products are broad, and both domestic and foreign markets urgently need these high-grade products.
She said that at present, China's phosphate products are dominated by the thermal phosphoric acid process, and it is not yet practical to replace them with advanced wet-process phosphoric acid. However, it is feasible to develop a part of yellow phosphorus to develop high-end products, and it can play a demonstration role. So far, using this new technology invented by Chuanda University and other units, Chongqing Fuling Chemical Industry Co., Ltd. and Anhui Liuguo Chemical Industry Co., Ltd. have successively built a 50,000-ton-level wet-process phosphoric acid purification demonstration device, which has performed well and produced industrial products. Grade and food grade products are currently being tackled at 100,000-ton or even larger units. Hubei Xingfa Group has just reached a technical cooperation intention with Sichuan University. These developments are quietly changing the pattern of traditional phosphorus chemical industry.
According to Professor Zhong Benhe, wet-process phosphoric acid is characterized by many types of impurities, large fluctuations in content, high viscosity of phosphoric acid, and strong corrosion. Therefore, purification of wet-process phosphoric acid is a long-recognized technical problem in the field of phosphorus chemical industry. The solvent extraction wet phosphoric acid purification technology developed by Sichuan University is currently one of the world's advanced phosphoric acid purification production processes. Prior to this, related technologies have been monopolized by foreign companies. This technology with China's independent intellectual property rights adopts a new type of mixed extractant to overcome the technical problems of low extraction of dilute phosphoric acid; the innovative process of deep desulfurization reduces the sulfate in refined phosphorous to below 20ppm, reaching the international leading level; with independent knowledge The large-scale vibration sieve tower technology of property rights solves the problem of equipment amplification; the new process of wet-process phosphoric acid classification can efficiently produce industrial-grade phosphoric acid and salt, and after concentration and purification, it can obtain food grade, pharmaceutical grade phosphoric acid and salt, and further crystallization purification. To produce electronic grade products, raffinate acid can also be used to make fertilizers and achieve phosphorus-free emissions. Particularly gratifying is that the current cost of thermal phosphoric acid is more than 4,500 yuan / ton, while the purification of wet-process phosphoric acid is only 3,500 yuan / ton, the economic benefits are considerable.
The single pattern in which most of China's phosphorus resources are used to produce phosphate fertilizer is quietly changing. At the 13th National Sulphur and Phosphorus Center held in Xiamen last week, Professor Zhong Benhe of Sichuan University revealed that the new technology of solvent extraction and purification of wet-process phosphoric acid developed by Chuanda University has been applied industrially to 3 sets of 50,000-ton devices. At present, we are advancing toward a larger scale, and new installations are also being actively planned. This independent technology will enable the transformation of phosphorus chemical products to refinement and high-grade, and greatly expand the field of phosphorus chemical development.