Selective separation of copper and zinc and regeneration of polymer from electroplating effluent using shear induced dissociation coupling with ultrafiltration

• Published in: The Korean journal of chemical engineering 2019, 36(8), 233, pp.1321-1327
• Main Authors: Tang, Shu-Yun, Qiu, Yun-Ren
• Format: Article
• Language: English
• Subjects: Biotechnology; Catalysis; Chemistry; Chemistry and Materials Science; Coordination compounds; Copper; Coupling; Effluents; Electroplating; Industrial Chemistry/Chemical Engineering; Materials Science; Polymers; Regeneration; Separation; Separation Technology; Shear rate; Thermodynamics; Ultrafiltration; Zinc; 화학공학
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-019-0310-2

Shear-induced dissociation coupling with ultrafiltration (SID-UF) was used to remove and separate copper and zinc from both simulative effluent and real electroplating effluent using polyacrylate sodium (PAAS) as complex-ant. The effects of pH and the mass ratio of polymer on metal ions (P/M) on the removal of copper and zinc were investigated in the ultrafiltration tests, and the optimum pH and P/M were 7.0 and 25, respectively. The shear rate distributions on the membrane surface at various rotating speeds were simulated by CFD software. The shear stabilities of the polymer-metal complexes studied at various pHs indicated that the complexes would dissociate when the shear rate exceeded the critical shear rates (γ c ), and the order of critical shear rate was PAA-Zn>PAA-Cu at the same pH. The contrast between these two complexes shear stabilities was used to separate copper and zinc and recovery complexant from electroplating effluent by SID-UF. The results show that copper and zinc can be separated at 1.06×10 5 s -1 1.58×10 5 s -1 . Compared to conventional complexation-ultrafiltration, SID-UF is a green and efficient method for the separation of metals and the regeneration of complexant.