Loza, S.; Loza, N.; Korzhov, A.; Romanyuk, N.; Kovalchuk, N.; Melnikov, S. Hybrid Membrane Technology for Acid Recovery from Wastewater in Coated Steel Wire Production: A Pilot Scale Study. Membranes2022, 12, 1196.
Loza, S.; Loza, N.; Korzhov, A.; Romanyuk, N.; Kovalchuk, N.; Melnikov, S. Hybrid Membrane Technology for Acid Recovery from Wastewater in Coated Steel Wire Production: A Pilot Scale Study. Membranes 2022, 12, 1196.
Loza, S.; Loza, N.; Korzhov, A.; Romanyuk, N.; Kovalchuk, N.; Melnikov, S. Hybrid Membrane Technology for Acid Recovery from Wastewater in Coated Steel Wire Production: A Pilot Scale Study. Membranes2022, 12, 1196.
Loza, S.; Loza, N.; Korzhov, A.; Romanyuk, N.; Kovalchuk, N.; Melnikov, S. Hybrid Membrane Technology for Acid Recovery from Wastewater in Coated Steel Wire Production: A Pilot Scale Study. Membranes 2022, 12, 1196.
Abstract
In the present study, the problem of the sulfuric acid recycling from spent copper plating solution was solved using a hybrid membrane technology, including diffusion dialysis and electrodialysis. A real solution from the production of copper-coated steel wire, containing 1.45 mol/L of sulfuric acid, 0.67 mol/L of ferrous sulfate and 0.176 mol/L of copper sulfate was processed. Diffusion dialysis with anion-exchange membranes was used to separate sulfuric acid and salts of heavy metals. Then purified dilute sulfuric acid was concentrated by electrodialysis. Energy consumption for sulfuric acid electrodialysis concentration at a current density of 400 A/m2 was 162 W·h/mol with current efficiency 16 %. After processing according to the hybrid membrane scheme, the solution contained 1.13 mol/L sulfuric acid, 0.077 mol/L ferrous sulfate and 0.022 mol/L copper sulfate. The resulting acid solution with a small amount of ferrous sulfate and copper sulfate met the established requirements for a copper plating bath solution and can be reused in production.
Keywords
diffusion dialysis; concentration; electrodialysis; ion-exchange membrane; separation of acids and salts; acid recovery
Subject
Chemistry and Materials Science, Electrochemistry
Copyright:
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