Changzhou Lihaiyuan has applied for a patent for an ammonium fluoride concentration, crystallization, and separation process that can effectively reduce the content of ammonium hydrogen fluoride in ammonium fluoride

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Changzhou Lihaiyuan has applied for a patent for a process of concentrating, crystallizing, and separating ammonium fluoride, which can effectively reduce the content of ammonium hydrogen fluoride in ammonium fluoride. According to a report from Finance World dated August 16, 2025, information from the Intellectual Property Office shows that Changzhou Lihaiyuan Engineering Technology Co., Ltd. has filed a patent application titled “A Process for Concentrating, Crystallizing, and Separating Ammonium Fluoride”, with the publication number CN120483187A; the application was submitted in May 2025. The patent abstract indicates that the present invention relates to the field of ammonium fluoride concentration technology, and more specifically, to a process for the concentration, crystallization, and separation of ammonium fluoride. The process includes the following steps: S1, the crude ammonium fluoride solution is preheated via heat exchanger 1 to produce primary steam condensate and mixture 1 ； In S2, mixture 1 is fed into a single-effect evaporation chamber where it is stirred and evaporated to produce secondary steam condensate and a concentrated ammonium fluoride solution ； In step S3, the concentrated ammonium fluoride solution is first passed through heat exchanger 2 for pre-cooling, and then fed into a freezing tank for intermittent cold crystallization. Ammonia water is introduced into the freezing tank to adjust the pH value; after that, the product is taken out and centrifuged to obtain the final product. The temperature in heat exchanger 1 is 45–55°C, while the temperature in the single-effect evaporation chamber is 78°C; this helps to reduce the content of ammonium hydrogen fluoride in ammonium fluoride and improves the crystallization efficiency of ammonium fluoride ； Maintaining a pH value of 7–9 and limiting the freezing time to 1.5–2.5 hours at a temperature of –2 to –8°C can improve the purity of ammonium fluoride, achieving levels of up to 98%. According to Tianyancha, Changzhou Lihaiyuan Engineering Technology Co., Ltd. was established in 2021 and is located in Changzhou. It is a company that operates in the field of professional technical services. The registered capital of the company is 2 million RMB. According to the big data analysis provided by Tianyancha, Changzhou Lihaiyuan Engineering Technology Co., Ltd. has 3 patent records; in addition, the company holds 2 administrative licenses.