Fluorine resource recovery and utilization in phosphorus chemical industry

In the production of wet-process phosphoric acid and phosphate fertilizers, a byproduct called "fluorosilicic acid" is generated. In the past, its disposal was a major challenge. Now, through mature chemical processes, fluorosilicic acid can be efficiently converted into an extremely important basic chemical raw material—anhydrous hydrogen fluoride (AHF). This process essentially involves the recovery and purification of fluorine elements associated with phosphate rock. AHF is the starting point for the preparation of high-end refrigerants, fluoropolymers, and even key electrolytes (lithium hexafluorophosphate) in new energy batteries. Therefore, this technology not only solves environmental problems but also achieves resource recycling and value-added processing, making it a crucial link in the extension and green upgrading of the phosphate chemical industry chain.