Method for producing vanadium-doped lithium iron phosphate from vanadium industrial wastewater and vanadium-doped lithium iron phosphate

• Main Authors: SONG MINGMING, WANG LU, DU NAIXU, ZHOU ZHENYANG, LI ZONGLIN
• Format: Patent
• Language: Chinese; English
• Published: 14.04.2020
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention provides a method for producing vanadium-doped lithium iron phosphate from vanadium industrial wastewater and vanadium-doped lithium iron phosphate. The method for producing vanadium-doped lithium iron phosphate from vanadium industrial wastewater comprises the following steps: adding a reducing agent into vanadium industrial wastewater to reduce vanadium to tetravalent or trivalent;adding an iron source and a phosphorus source, stirring to form a solution; adding an alkaline substance into the solution under the protection of an inert atmosphere, filtering, washing to remove sodium to obtain vanadium-doped ammonium ferrous phosphate; carrying out primary calcination on the vanadium-doped ammonium ferrous phosphate to obtain vanadium-doped iron phosphate; mixing the vanadium-doped iron phosphate with a carbon source and a lithium source, carrying out ball milling, carrying out secondary calcination to obtain carbon-coated lithium iron vanadium phosphate; adding sodium hydroxide into the filtrate