電池反応を利用したエッチング廃液からの銅回収

概要

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The recovery of copper metal from waste hydrochloric acid with cupric ions was electrochemically demonstrated by the use of a polymer electrolyte fuel cell system. The electrochemical cell used in this study consists of two baths for gas and liquid. Hydrogen gas was fed to a Pt/C anode electrode assembled on the cation exchange membrane (MEA), and Pt mesh for a cathode electrode was immersed in CuSO4 / HCl (1 M / 1 M) solution as a model solution of waste acid with cupric ions. Copper metal was electrochemically recovered on the cathode electrode without chlorine gas evolution on the anode electrode. However, copper deposition on the anode electrode was observed because of penetration of cupric ions through the cation exchange membrane. While this phenomenon damaged the MEA, the electrochemical cell with two baths was improved to that with three baths separated by a cation and anion exchange membrane, which successfully prevented copper deposition on the MEA.
富山大学の論文