Method for preparing battery-grade iron phosphate from fertilizer-grade monoammonium phosphate

• Main Authors: GUO XIAODONG, LI HAODONG, SONG YANG, ZHONG BENHE, WU ZHENGUO
• Format: Patent
• Language: Chinese; English
• Published: 25.08.2023
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention belongs to the technical field of lithium battery materials, and particularly relates to a method for preparing battery-grade iron phosphate from fertilizer-grade monoammonium phosphate. The preparation method comprises the following steps: step 1, dissolving fertilizer grade monoammonium phosphate with water at 95-110 DEG C, and carrying out solid-liquid separation to obtain a monoammonium phosphate solution; and 2, co-precipitating the monoammonium phosphate solution obtained in the step 1 with iron salt, or carrying out oxidation co-precipitation with ferrite, carrying out solid-liquid separation, and purifying to obtain the battery-grade iron phosphate. By adopting the method disclosed by the invention, the production cost of the battery-grade iron phosphate can be remarkably reduced, and the method has a very good application prospect. 本发明属于锂电池材料技术领域，具体涉及一种采用肥料级磷酸一铵制备电池级磷酸铁的方法。本发明的制备方法包括如下步骤：步骤1，将肥料级磷酸一铵用95-110℃的水溶解，固液分离，得到磷酸一铵溶液；步骤2，将步骤1得到的磷酸一铵溶液与铁盐进行共沉淀，或与亚铁盐进行氧化共沉淀，固液分离，纯化，即得电池级磷酸铁。采用本发明