Production process for preparing battery-grade iron phosphate from wet-process phosphoric acid and related acid thereof

The invention relates to a production process for preparing battery-grade iron phosphate from wet-process phosphoric acid and related acids thereof, and belongs to the technical field of wet-process phosphoric acid production. The technical problem to be solved by the invention is to provide a low-cost production process for preparing battery-grade iron phosphate from wet-process phosphoric acid and related acids thereof as raw materials. According to the process, battery-grade iron phosphate is obtained through extraction, concentration defluorination, chemical defluorination, NH4H2PO4 solution preparation, reaction, oxidation, pH adjustment, precipitation separation, washing and drying. The method provided by the invention is low in production cost, and can realize recycling of fluorine resources. According to the method, the NH4H2PO4 solution is extracted and separated from the purified wet-process phosphoric acid by adopting a specific extraction and reverse extraction method or a specific two-time neutra