▎ 摘　　要

NOVELTY - Recycling lithium/sodium ion battery anode material production waste liquid, comprises (a) adding dilute sulfuric acid into production waste liquid after ammonia extraction treatment to adjust pH value to neutral to obtain sodium sulfate solution; (b) adding ferrous sulfate into sodium sulfate solution, so that molar ratio of elements in solution is sodium, iron, and sulfur = 2.7-3:1.5-1.65:3, passing inert gas into solution, adding antioxidant to inhibit oxidation of ferrous ions, and stirring to obtain a mixed solution; (c) slowly adding the carbon source into the mixed solution under ultrasonic conditions, and stirring to obtain the precursor solution; (d) transferring the above precursor solution to a spray dryer for spray granulation to obtain a precursor powder; and (e) placing the precursor powder obtained by spray drying under an inert atmosphere, and performing heat treatment to obtain a conductive carbon-modified sodium ferrous sulfate composite anode material. USE - The sodium ferrous sulfate anode material is used as the anode material of the sodium ion battery in the sodium ion battery (claimed). ADVANTAGE - The method provides high economic benefit of lithium/sodium ion battery material anode waste liquid recycling method and obtained material and application. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for sodium ferrous sulfate anode material i.e. Na2+2xFe2-x(SO4)3/C (x=0.35-0.5).