▎ 摘　　要

NOVELTY - Zero-discharge treatment method for full resource utilization of waste acid in the production process of graphene comprises: e.g. stirring high-salt residual liquid obtained by high-salt dialysis and precipitated manganese by adding potassium hydroxide and PAM, press-filtering precipitated manganese mud to obtain manganese filter cake, and conveying precipitating supernatant into the subsequent mechanical vapor recompression (MVR) evaporation crystallization system; conveying the nanofiltration membrane purified acid into the multi-effect waste acid evaporating and concentrating system to obtain the sulfuric acid with the satisfied concentration; stirring filtrate and precipitate supernatant by adding sulfuric acid to adjust the pH value to neutral, and then evaporating and concentrating by MVR, crystallizing to obtain potassium sulfate, circulating and recycling distilled water. USE - Zero-discharge treatment method for full resource utilization of waste acid in the production process of graphene. ADVANTAGE - The method realizes the classification recycling treatment of sulfuric acid, manganese, potassium, water resource in the waste acid, realizes resource zero discharge, satisfies environmentally friendly requirement, and solves the problem of the enterprise. DETAILED DESCRIPTION - Zero-discharge treatment method for full resource utilization of waste acid in the production process of graphene comprises: (1) collecting the graphene waste acid in the adjusting tank, uniformly homogenizing the waste acid, reducing the waste acid index fluctuation, ensuring the stability of the subsequent process flow; (2) using carbon particles, manganese sand medium filtering or ultra-micro filter membrane filtering to remove the suspension and colloid particles in the waste acid; (3) using nano-filtration membrane process to separate the waste acid, concentrating, conveying the purified and filtered acid into the subsequent waste acid concentrating system; conveying nanofiltration membrane concentrated solution into the high-salt dialysis membrane system, realizing effective separation of potassium, manganese sulfate and sulfuric acid component, recycling the acid and returning to the nanofiltration membrane feeding device, conveying the high-salt residual liquid into the subsequent materialization precipitation process; (4) stirring high-salt residual liquid obtained by high-salt dialysis and precipitated manganese by adding potassium hydroxide and PAM, press-filtering precipitated manganese mud to obtain manganese filter cake and conveying precipitating supernatant into the subsequent Mechanical vapor recompression (MVR) evaporation crystallization system; (5) conveying the nanofiltration membrane purified acid into the multi-effect waste acid evaporating and concentrating system to obtain the sulfuric acid with the satisfied concentration; (6) adjusting filtrate and precipitated supernatant pH to neutral by adding sulfuric acid, and then evaporating and concentrating by MVR, crystallizing to obtain potassium sulfate, circulating and recycling distilled water.