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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