Wet-process phosphoric acid purification system realizes miniaturization

On June 19, it is understood that the 120,000 tons/year wet-process phosphoric acid purification micro-chemical complete set of technology jointly developed by Wengfu (Group) Co.
, Ltd.
and Tsinghua University passed the scientific and technological achievement appraisal organized by the China Petroleum and Chemical Industry Federation
.
The appraisal committee believes that this technological achievement has broken the foreign monopoly, realized the miniaturization of the wet-process phosphoric acid purification system, and the overall technology is at the international leading level, and the promotion and application should be further increased
.
The appraisal committee is composed of industry experts such as Li Yongwu, former president of the Petrochemical Federation, Academician Duan Xue of Beijing University of Chemical Technology, Academician Li Hongzhong of Chinese Academy of Sciences, Academician Fei Weiyang of Tsinghua University and Professor Zhu Jiahua of Sichuan University
.
The appraisal opinions show that the technology closely follows the characteristics of China's phosphorus chemical resources and processing, and has achieved three innovative results: First, it has laid the foundation for the miniaturization of the wet-process phosphoric acid purification system
.
By revealing the differential synergistic extraction behavior and regulation mechanism of methyl isopropyl ketone (MIBK) on phosphoric acid-water and metal ion-water, invented a single-stage extraction suitable for wet-process phosphoric acid with high impurity content, monoammonium phosphate saturation Single-stage washing of aqueous solution and a simple process of single-stage back extraction based on the critical phosphoric acid concentration
.
? The second is to realize the localization of a variety of micro-chemical equipment
.
This technological achievement breaks through the principle limitations of micro-chemical engineering such as mass production of solid materials and extreme working conditions.
It proposes a design strategy for microstructure equipment, and invents vertical flow micro-flute extraction micro-equipment, double micro-sieve extraction equipment and extreme flow ratio.
High-efficiency micro-mixing equipment and a variety of micro-structure elements have developed a single micro-extractor, micro-back extractor, decolorizing micro-reactor with a processing capacity of 120,000 tons/year, and micro-washing equipment with a capacity of 10,000 tons/year
.
Compared with the imported tower extraction equipment, the micro-equipment developed by this achievement is small in size and high in efficiency, which reduces the risk of investment in technical equipment
.
? The third is to build a flexible, efficient and reliable wet-process phosphoric acid purification microchemical system based on extraction, washing, back extraction, and decolorization processes, and through long-term system operation tests, it reveals the precipitation formation, migration law and feed stability The impact of nature on the performance of micro-equipment, the micro-system integration based on process and conventional equipment characteristics and the control and maintenance strategy of the sensitive points of the whole system are proposed.

.
? It is understood that the world's first 120,000 tons/year wet-process phosphoric acid purification microchemical system built using this technology has achieved industrial production
.
The food-grade phosphoric acid produced by using this technological achievement reduces the cost of the thermal process by 23.
8%, and the cost of the imported wet-process phosphoric acid purification technology is reduced by 4.
2%.
The equipment operation does not emit VOCs-containing tail gas, the extractant inventory in the system and the corresponding Safety and environmental protection pressure is significantly reduced
.
? In addition, this technology also helps to improve the comprehensive utilization level of phosphate rock resources
.
Based on the annual output of 1 million tons of purified phosphoric acid, it can reduce carbon dioxide emissions by 1.
2 billion cubic meters per year and save 4.
8 billion kilowatt-hours of electricity compared with thermal acid
.
This technology has been authorized with 12 national invention patents and 64 utility model patents
.