TAILIEUCHUNG - Selective and effective recovery of copper from printed circuit board scraps

Electronic waste (e-waste) contains significant amount of valuable metals such as gold, silver, copper, zinc, lead, and etc. [1]. At present, e-waste has been considered as a potential reusable resource for materials mining encompassing from the above listed popular metals to technologically vital and evidently exhausted rare earth elements [2]. Printed circuit board (PCB) scrap as a principal e-waste component, has been recovered for years to produce various metals, among which copper takes the first place. Nevertheless, copper commonly presents at high content in PCB and in e-wastes, its selective and efficient recovery is always considered a challenging issue due to simultaneous occurrence of other elements and substances hindering separation process. | Vietnam Journal of Science and Technology 55 (5B) (2017) 217-226 SELECTIVE AND EFFECTIVE RECOVERY OF COPPER FROM PRINTED CIRCUIT BOARD SCRAPS Nguyen Trung Hai Thinh1, Tran Van Man1, 2, Tran Thi Phuong Thao1, Nguyen Nhi Tru3 1 Department of Physical Chemistry, Faculty of Chemistry, University of Science, VNU-HCM, 227 Nguyen Van Cu street, District 5, Ho Chi Minh City 2 Laboratory of Applied Physical Chemistry, Faculty of Chemistry, University of Science, VNUHCM, 227 Nguyen Van Cu street, District 5, Ho Chi Minh City 3 Department of Energy Materials and Applications, Faculty of Materials Technology, University of Technology, VNU-HCM, 268 Ly Thuong Kiet street, District 10, Ho Chi Minh City * Email: tvman@ Received: 25 September 2017; Accepted for publication: 7 October 2017 ABSTRACT Copper was recovered from printed circuit boards (PCB) scraps by the combined mechanical and electrochemical method using 7M nitric acid as leaching agent followed by metal electrodeposition electrolyzing leachate. The metal recovery selectivity and effectivity were investigated through determination of electrodeposition potentials based on anodic stripping voltammetry (ASV). Linear sweep voltammetry (LSV) and cyclic voltammetry (CV) techniques were also used to reveal the optimized electrolysis parameters. The influence of various process parameters such as current density, pH, and temperature on electrodeposition efficiency was examined. The high recovery efficiency, more than 90 %, was reached for copper electrodeposition from PCB leachate at cathodic current density of 20 mA/cm2, pH=1 and temperature is 40 oC of the electrolyzer solution. Keywords: printed circuit board, electrodeposition potential, copper deposition. 1. INTRODUCTION Electronic waste (e-waste) contains significant amount of valuable metals such as gold, silver, copper, zinc, lead, and etc. [1]. At present, e-waste has been considered as a potential reusable resource for materials mining encompassing

• Hoá học
• Electronic waste (e waste)
• Printed circuit board (PCB)
• The technologically vital
• Evidently exhausted rare earth elements
• Copper recovery process
• Vietnam Journal of Chemistry
• Optimization of the leaching process
• The printed circuit boards productions sludge
• Copper recovery via electrolysis
• The Hanoi Urban Environment One Member Limited Company