Method for preparing lithium iron phosphate from pyrite and lithium iron phosphate material

• Main Authors: ZHAO XIAOLIAN, XU JIAN, LI SHIWEN, FANG GANG, SHEN JIAHUA
• Format: Patent
• Language: Chinese; English
• Published: 08.02.2022
• Subjects: AMMONIA; CHEMISTRY; COMPOUNDS THEREOF; CYANOGEN; FERTILISERS; INORGANIC CHEMISTRY; MANUFACTURE THEREOF; METALLURGY; NITROGENOUS FERTILISERS; NON-METALLIC ELEMENTS

The invention discloses a method for preparing lithium iron phosphate from pyrite and a lithium iron phosphate material. According to the preparation method, the pyrite is directly used for preparing ferric sulfate, so that production and transportation of a byproduct sulfuric acid are reduced; meanwhile, phosphoric acid is directly used for preparing iron phosphate, compared with direct use of phosphate, the process of preparing phosphate with phosphoric acid is omitted, and the price of phosphoric acid is lower than that of phosphate; the iron phosphate is prepared by using a coprecipitation method, the generated waste liquid can be used for preparing ammonium sulfate, the ammonium sulfate is a very good nitrogen fertilizer, harmful byproducts generated in the preparation process are few, and the pollution to the environment is reduced; and the lithium iron phosphate is prepared by using iron phosphate and lithium carbonate through a carbon thermal reduction method, the process is simple, the product is con