▎ 摘　　要

NOVELTY - A processing and recycling device of graphene wastewater includes a graphene acid wastewater inlet, a sodium hydroxide neutralization tank connected to the graphene acid wastewater inlet, and an air flotation tank connected to the sodium hydroxide neutralization tank. The air flotation tank is also connected with a gas flow dryer and a super magnetic separator respectively. The airflow dryer is connected to a first graphene recovery box through a first precision screen. The super magnetic separator is connected with a drum dryer. The drum dryer is connected to a second graphene recovery box through a second precision screen. The super magnetic separation system is also connected with treated water outlet. USE - Processing and recycling device of graphene wastewater. ADVANTAGE - The device has characteristics of reasonable structural design and convenient and efficient treatment, and can improve treatment effect of graphene wastewater and recovery rate of graphene. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for usage method of the processing and recycling device of graphene wastewater, which involves: (a) entering graphene acid wastewater to be treated with pH of 12-14 to the sodium hydroxide neutralization tank through the graphene acid wastewater inlet and using 5-15% sodium hydroxide solution in the sodium hydroxide neutralization tank to adjust the pH value of the graphene acid wastewater to be treated to pH of 6-8; (b) entering treated wastewater to air flotation tank, where the surface solid load of the air flotation tank is 15-25 kg/(m2.h), the gas-solid ratio is 0.001-0.06, the drainage turbidity is 3-10 NTU, the graphene removal rate of the air flotation tank is 80-90% and the graphene content of the effluent of the air flotation tank is 200-500 mg/L; (c) entering portion of the graphene wastewater treated by the air flotation tank to airflow dryer and other portion to supermagnetic separator; (d) filtering obtained graphene by first precision screen, turning on blower and preheater, adding solid wet graphene material from hopper, pushing solid wet graphene material into air drying tube by screw feeder to be dried, separating dried material by cyclone separator and discharging dried graphene particles; (e) sieving by first precision screen, obtaining graphene particles with particle size of less than 75 microns and purity of 99-99.2%; (f) connecting supermagnetic separation system with the air flotation tank, for further reducing the graphene content of the effluent of the air flotation tank, where the graphene content of the effluent of the air flotation tank is 200-500 mg/L, the graphene content of the effluent of the air flotation tank of the supermagnetic separation system is less than 10 mg/L and the graphene removal rate is 95-98%; and (g) discharging water through water outlet and transporting sludge containing magnetic powder to magnetic seed mixing tank, entering remaining particles to drum dryer and obtaining graphene through second precision screen. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view explaining process of the processing and recycling device of graphene wastewater. (Drawing includes non-English language text).