Method for producing lithium iron phosphate by taking iron phosphate dihydrate as raw material through one-step method

• Main Authors: LIU LEI, YANG LIANZHI, XIE HAOJIANG, QIU SHIWEI
• Format: Patent
• Language: Chinese; English
• Published: 18.11.2022
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention discloses a method for producing lithium iron phosphate by taking iron phosphate dihydrate as a raw material through a one-step method. The method comprises the following steps: S1, adding iron powder into dilute phosphoric acid for dissolving; performing solid-liquid separation; s2, oxidizing the pure ferrous dihydrogen phosphate solution and hydrogen peroxide; s3, carrying out solid-liquid separation and solid-phase washing on the iron phosphate dihydrate crystal slurry; s4, adding a conditioning agent and pure water into the washed slurry to prepare slurry with the solid content of 30%-40%, measuring the specific gravity of the slurry, determining the water content of the slurry according to a relation curve of the water content and the specific gravity of the iron phosphate slurry, calculating the amount of water needing to be supplemented according to the water content, and supplementing pure water to control the solid content of the slurry to be 30%-35%, then calculating the actual mass of