NDLI: Study on metals recovery from discarded printed circuit boards by physical methods

Content Provider	IEEE Xplore Digital Library
Author	Xuefeng Wen Yuemin Zhao Chenlong Duan Xiaohua Zhou Hongguang Jiao Shulei Song
Copyright Year	2005
Description	Author affiliation: Dept. of Environ. Sci. & Eng., Tsinghua Univ., Beijing, China (Xuefeng Wen)
Abstract	Study on discarded printed circuit boards (PCBs) reutilization has important significance and application values, which can not only achieve secondary resources recycling, but also prevent environment pollution. Physical methods show great potential and advantages on discarded PCBs reutilization comparing with chemical and biological methods. In the paper, an effective physical method was introduced to recover metals from discarded PCBs. A double-toothed roll shear and a hammer crusher were employed to achieve liberation of metals from other components contained in the PCBs. Metals of -2+0.074 mm in PCBs were recovered by a conventional high tension electrostatic separator, while metals in the -0.074 mm were reclaimed by enhanced gravity concentrator (Falcon concentrator). Experimental study indicates that the liberation mechanism of printed wiring boards (PWBs) and integrated cards (ICs) can be explained by dispersion liberation accompanied disengaging liberation and ideal metal liberation degree is around 0.5 mm, while the liberation mechanism of slots can be explained by disengaging liberation. For -2+0.5mm feed PCBs, the integration efficiency of 89.32% can be achieved when power supply voltage is 27 KV, roller rotation speed being 80 rpm and three corona electrodes and one static electrode applied; for -0.5+0.074 mm feed, the corresponding integration efficiency is 71.14 % when power supply voltage is 22 KV, roller rotation speed 150 rpm and one corona electrodes and one static electrode used; the integration efficiency of -0.074 mm PCBs is 80.77 % if slurry concentration is 40 g/l with water pressure of 0.01 MP and rotation speed of 50 Hz. Based on experimental study, the innovative flowsheet of "mechanical shredding + screening + electrostatic separation + Falcon centrifugal separation" was brought forward to recover metals from discarded PCBs.
Sponsorship	IEEE Comput. Soc., Tech. Comm. on Electron. and the Environ
Starting Page	121
Ending Page	128
File Size	1066189
Page Count	8
File Format	PDF
ISBN	0780389107
ISSN	10952020
DOI	10.1109/ISEE.2005.1437005
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-05-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Printed circuits Electrodes Electrostatics Feeds Power supplies Voltage Corona Recycling Pollution Chemicals
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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