No.16 Recovery system of Cu included in waste etching liquid using brown coal

Abstract

Brown coal has many oxygen-containing functional groups such as carboxyl groups and it is ion-exchangeable with metal species. The experimental was carried out by following 3 steps: (1) Cu was separated from Fe included in waste etching liquid adding NH_3. (2) Cu was recovered by ion-exchange with brown coal. (3) The residue after ion exchange was used instead of NH_3 to separate Cu and Fe.