▎ 摘　　要

NOVELTY - Preparing waste liquid absorbing material comproses dispersing ferric salt, graphene, and additive in an aqueous solution to form a solution A, dissolving organic complexing agent in organic solvent to form a solution B, and transferring solution A to solution B, mixing evenly, adjusting pH of the solution by dropping ammonia solution, and transferring solution into a sealed reactor, carrying out hydrothermal reaction, washing with water and alcohol, and drying to obtain waste liquid absorbing material USE - The waste liquid absorbing material is useful in field of lithium-ion battery sewage treatment. ADVANTAGE - The waste liquid absorbing material removes organic matter, recycles ammonia and metal ion, improves environmentally friendly performance, and is economical. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a waste liquid adsorption system comprising waste liquid pool, ozone oxidation reactor, adsorption device, vacuum deamination kettle, gas recovery condensing device and metal salt recovery device, waste liquid pool, ozone oxidation reactor, adsorption device, and vacuum deamination tank are connected in sequence, and vacuum deamination tank includes a gas outlet connected to a gas recovery condensing device and a liquid outlet connected to a metal salt recovery device, adsorption device is filled with the waste liquid adsorption material; and a method for processing waste liquid comprising (1) passing waste liquid in the waste liquid pool into ozonation reactor to degrade organic matter in waste liquid, (2) entering adsorption device to adsorb aromatic, aliphatic, organic matter containing nitrogen, oxygen, and sulfur polar functional groups, and adsorbing trace doping metal sources and large-size sodium ions, and (3) passing vacuum deamination kettle, heating under reduced pressure until boiling, and ammonia gas is further led to the gas recovery condensing device to collect high-concentration ammonia water, liquid below the autoclave is the concentrated liquid of the metal salt, and collecting by the metal salt recovery device and re-mixed to be used as the raw material liquid for preparation of the precursor. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of waste liquid processing system of waste liquid absorbing material (Drawing includes non-English language text).