▎ 摘　　要

NOVELTY - Method for preparing lithium ion sieve and graphene oxide involves (a) soaking lithium salt in aqueous solution of sulfuric acid, leaching graphite powder and insoluble substance in leaching solution, and converting to soluble lithium salt; (b) filtering organic matter and carbon black in leaching liquid, washing and drying, roasting, and high-temperature gasifying; (c) leaching the graphite powder in 95 % concentrated sulfuric acid, using potassium permanganate to oxidize graphite powder to generate graphene oxide, using hydrogen peroxide to decompose excess potassium permanganate and generate manganese dioxide precipitate, converting into soluble manganese sulfate, filtering and separating nano graphene oxide precipitate; (4) using titanium anode electrolytic oxidation waste sulfuric acid liquid in manganese sulfate; and (5) mixing recovered electrolytic manganese dioxide (MnO2) and recovered lithium carbonate (Li2CO3) product, roasting, reacting, and eluting. USE - The method is useful for preparing lithium ion sieve and oxidized graphite alkene, which is useful in a lithium ion battery. ADVANTAGE - The method utilizes a large amount of waste sulfuric acid and waste manganese sulfate in graphene oxide production, which not only can solve the problem of waste acid and heavy metal pollution produced by graphene oxide, but also improves the technical economical efficiency of lithium ion sieve production process; and provides graphene oxide with good conductivity, which can be used as lithium ion battery and super capacitor electrode material. DETAILED DESCRIPTION - Method for preparing lithium ion sieve and graphene oxide involves (a) soaking lithium salt in aqueous solution of 0.5-1 mol/l sulfuric acid at 20-50?oC for 4-12 hours, completely leaching the graphite powder and the insoluble substance in a leaching solution, and converting it to a soluble lithium salt, using lithium ion sieve adsorption method for selectively absorbing lithium; using 0.5 mol/L sulfuric acid water solution to elute, concentrating, then adding sodium carbonate solution, depositing and separating to obtain micro-soluble battery level Li2CO3 product; (b) filtering organic matter and carbon black in leaching liquid, washing and drying, roasting at 600-800degrees Celsius for 0.5-2 hours, and high-temperature gasifying to obtain remaining sheet graphite powder; (c) leaching the graphite powder for 8-12 hours in 95 % concentrated sulfuric acid with mass of 3-10 times, using potassium permanganate to oxidize graphite powder for 3-6 times mass to generate graphene oxide, using hydrogen peroxide to decompose excess potassium permanganate and generate manganese dioxide precipitate, converting into soluble manganese sulfate, filtering and separating the nano graphene oxide precipitate, and ultrasonic dispersing in aqueous solution to obtain nano graphene oxide suspension product; (4) using titanium anode electrolytic oxidation waste sulfuric acid liquid in manganese sulfate, where electrolyte temperature is 90-100degrees Celsius, and controlling the anode current density at 40-80 A/m2 to deposit MnO2 on anode surface; and (5) mixing recovered electrolytic MnO2 and recovered Li2CO3 product at Li/Mn mol ratio of 0.8-1: 1, roasting at 600-700degrees Celsius for 1-4 hours, subjecting lithium salt and manganese dioxide to thermal chemical reaction to obtain manganese series lithium ion (Li1.33Mn1.67O4) sieve precursor; and eluting lithium salt using 0.5 mol/L sulfuric acid solution, obtaining manganese based lithium ion sieve manganese dioxide dihydrate (MnO2.0.4H2O) measured in 0.5 g/L lithium chloride aqueous solution, where lithium adsorption capacity is 40-45 mg/g and the dissolution rate of lithium ion sieve is 0.6-0.9 % after circulating for 10 times, and where the waste sulfate solution can be recycled for leaching the cathode material of waste lithium ion battery.