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Investigation of ability liberation of metals from printed circuit boards by mechanical processes for physical separation processes

In this study, the liberation of metals from computer PCBs was conducted in detail by mechanical processes including cutting and crushing. The obtained results demonstrate the distribution metallic and non-metallic component weighs as a function of particle sizes. | Journal of Science and Technology 54 (2A) (2016) 237-243 INVESTIGATION OF ABILITY LIBERATION OF METALS FROM PRINTED CIRCUIT BOARDS BY MECHANICAL PROCESSES FOR PHYSICAL SEPARATION PROCESSES Ha Vinh Hung1, *, Dao Duy Nam1, Nguyen Thanh Trung1, 2, Nguyen Duc Quang1, Huynh Trung Hai1 1 School of Environmental Science and Technology, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Vietnam 2 Faculty of Environment, Hanoi University of Natural Resources and Environment, No. 41 A Phu Dien Road, North-Tu Liem District, Hanoi, Vietnam Email: hung.havinh@hust.edu.vn Received: 5 May 2016; Accepted for publication: 26 June 2016 ABSTRACT Physical separation process was widely applied for the separation of metallic component from Printed Circuit Boards (PCBs) due to their advantages as friendly-environment, facilitated control, and low-cost. However, the efficiency of physical separation depends on a level of the liberation between the metallic and non-metallic components which is conducted by mechanical processing. In this study, the liberation of metals from computer PCBs was conducted in detail by mechanical processes including cutting and crushing. The obtained results demonstrate the distribution metallic and non-metallic component weighs as a function of particle sizes. The separation efficiency of metals was conducted by air separation using vacuum sorter equipment. The results showed that the comminution processes using hammer mill for reach the highest efficiency with 92 % recovery and 87 % grade of metallic components in the heavy fraction with particle size 1.0 - 1.4 mm by air separation process. Keywords: Mechanical process, Printed Circuit Boards (PCBs), metallic liberation, 1. INTRODUCTION The products of electric and electronic equipment have rapidly increased year by year. Together with this, large amount of waste from electric and electronic equipment (WEEE) are being generated in worldwide. Globally, more than 50 million tons of .