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Technology for the Purification of Electroplating Washwater from Cadmium Ions by Membrane and Membraneless Electrolysis

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Abstract

A technology for removing toxic Cd2+ from electroplating process electrolytes and washwater containing \({\text{SO}}_{4}^{{2 - }}\) or Cl– is proposed. This technology makes it possible to decrease the concentration of Cd2+ in treated solutions to 0.1–0.07 g/L and the Cd2+ ingress into plant waste waters by 288–366 times and attain a Cd2+ recovery of 99.7%. Electrolysis in a dual-chamber cell with an anion-exchange membrane makes it possible to return Cd and a H2SO4 solution back into the process. The removal of Cd2+ from Cl– containing solutions is recommended to be performed by membrane electrolysis, separating the insoluble anode with a chemically stable cation-exchange membrane to prevent the migration of Cl– from the catholyte into the anolyte and, correspondingly, their oxidation on the insoluble anode with the liberation of toxic Cl2.

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Authors and Affiliations

  1. Mendeleev University of Chemical Technology of Russia, 125047, Moscow, Russia

    D. Yu. Turaev, V. A. Kolesnikov & N. A. Popov

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  1. D. Yu. Turaev
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  2. V. A. Kolesnikov
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  3. N. A. Popov
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Correspondence to D. Yu. Turaev.

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Translated by E. Glushachenkova

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Turaev, D.Y., Kolesnikov, V.A. & Popov, N.A. Technology for the Purification of Electroplating Washwater from Cadmium Ions by Membrane and Membraneless Electrolysis. Theor Found Chem Eng 54, 200–207 (2020). https://doi.org/10.1134/S0040579520010224

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