Separation and Purification Technology
The large amount of Cu present in printed circuit boards (PCBs) residues, usually about ten times more than the Cu amount present in rich-content minerals, makes these residues an attractive secondary source of Cu. Thus, the main aim of this work was to develop a simple and nearly-closed two-step process to recover Cu from PCBs residues with high purity. Firstly, a multi-element leaching solution, containing 78% of the total amount of Cu present in the residue together with other metals, was obtained using acidic (HNO3 2 mol/L for 210′ at 50 °C) conditions. In a second step, a bispicolylamine resin was used to recover Cu with high selectivity from the multi-element (59.0% Cu) leaching solution and a final Cu solution with high purity (99.0%) was obtained after eluting, with H2SO4 4 mol/L, the Cu retained in the column. Additionally, the amount of Al (85%) leached from the residue, present in the raffinate, was totally recovered as a solid of Al(OH)3. © 2016 Elsevier B.V. All rights reserved.
Year of publication: 2016