scholarly journals COPPER AND LEAD RECOVERY FROM DISCARDED PRINTED CIRCUIT BOARDS BY ELECTROLYSING LEACHED SOLUTION

2018 ◽  
Vol 55 (1B) ◽  
pp. 129
Author(s):  
Tran Thi Phuong Thao
Keyword(s):  
Printed Circuit Boards ◽  
Recovery Process ◽  
Xrd Analysis ◽  
Composition Analysis ◽  
Copper Electrodeposition ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Electrochemical Parameters ◽  
Lead Recovery ◽  
Acidic Dissolution

Results of copper and lead recovery from discarded printing circuit boards (PCB) by acidic dissolution and electrodeposition are presented. A preliminary procedure of the recovery process is proposed with the following steps: disposal of the mounted electrical elements, cleaning, grinding, iron separation for grains screening, metal dissolution, and electrolysis. The composition analysis is performed to define suitable electrochemical parameters for recovery. XRF and AAS techniques are used for preliminary estimation of metal content in leached solution. LSV method is implemented to establish parameters for copper electrodeposition. The product quality is evaluated through XRD analysis. The high recovery efficiencies, 97.61% and 96.59 % for copper (in metallic form) and lead (in dioxide form), respectively, were reached.  

scholarly journals Effective Recovery Process of Copper from Waste Printed Circuit Boards Utilizing Recycling of Leachate

JOM ◽  
2020 ◽  
Author(s):  
Joona Rajahalme ◽  
Siiri Perämäki ◽  
Roshan Budhathoki ◽  
Ari Väisänen
Keyword(s):  
Hydrogen Peroxide ◽  
Sulfuric Acid ◽  
Printed Circuit Boards ◽  
Sulfuric Acid Concentration ◽  
Recovery Process ◽  
Copper Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Acid Consumption

AbstractThis study presents an optimized leaching and electrowinning process for the recovery of copper from waste printed circuit boards including studies of chemical consumption and recirculation of leachate. Optimization of leaching was performed using response surface methodology in diluted sulfuric acid and hydrogen peroxide media. Optimum leaching conditions for copper were found by using 3.6 mol L−1 sulfuric acid, 6 vol.% hydrogen peroxide, pulp density of 75 g L−1 with 186 min leaching time at 20°C resulting in complete leaching of copper followed by over 92% recovery and purity of 99.9% in the electrowinning. Study of chemical consumption showed total decomposition of hydrogen peroxide during leaching, while changes in sulfuric acid concentration were minor. During recirculation of the leachate with up to 5 cycles, copper recovery and product purity remained at high levels while acid consumption was reduced by 60%.

Preparation of Cuprous Oxide from Industrial Leaching Liquid Using the Microwave Thermo-Ethanol Method

2009 ◽  
Vol 79-82 ◽  
pp. 2131-2134
Author(s):  
Han Yu Lin ◽  
Chao Yin Kuo ◽  
Chung Hsin Wu ◽  
Tsai Hsung Lin
Keyword(s):  
Cuprous Oxide ◽  
Inductively Coupled Plasma ◽  
Printed Circuit Boards ◽  
Optical Emission ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Circuit Boards ◽  
Prepared Powder ◽  
Printed Circuit ◽  
Inductively Coupled

This study investigates the use of the microwave thermo-ethanol method to recover cuprous oxide from waste liquid that contains heavy metals, formed by the leaching of acid from sludge of printed circuit boards. An XRD analysis yields main peaks of cuprous oxide 2θ = 36.45° and 42.35°. SEM analysis indicates that the cuprous oxide was octahedral when 0.1 M glucose, or a higher concentration, was added to the waste liquid. The purity of prepared powder of cuprous oxide was analyzed using an inductively coupled plasma-optical emission spectrometer (ICP-OES), and the purity of the prepared powder of cuprous oxide was found to exceed 70%. Accordingly, in this study, metallic resources were regenerated.

scholarly journals Development of a Physical Separation Route for the Concentration of Base Metals from Old Wasted Printed Circuit Boards

Minerals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1014
Author(s):  
Pedro Jorge Walburga Keglevich de Buzin ◽  
Weslei Monteiro Ambrós ◽  
Irineu Antônio Schadach de Brum ◽  
Rejane Maria Candiota Tubino ◽  
Carlos Hoffmann Sampaio ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Electronic Devices ◽  
Preliminary Evidence ◽  
Composition Analysis ◽  
Base Metals ◽  
Circuit Boards ◽  
Physical Separation ◽  
Printed Circuit ◽  
Processing Circuit

Wastes from old electronic devices represent a significant part of the electronic scrap generated in developing countries, being commonly sold by collectors as low-value material to recycling hubs abroad. Upgrading the quality of this waste type could drive the revenue of recyclers, and thus, boost the recycling market. On this basis, this study investigated the possibility of concentrating metals from old wasted printed circuit boards through a physical separation-based route. Preparation of samples comprised fragmentation, size classification, density, and magnetic separation steps, followed by chemical and macro composition analysis. Cu, Al, Fe, and Sn constituted the major metals encountered in the scraps, including some peak concentrations of Zn, Sb, Pb, Ba, and Mn. Four distinct concentrate products could be obtained after suitable processing: (a) a light fraction composed of plastics and resins; (b) an aluminum concentrate; (c) a magnetic material concentrate, containing mainly iron; (d) a final concentrate containing more than 50% in mass of copper and enriched with nonferrous metals. Preliminary evidence showed that further processes, like the separation of copper wires through drumming, can potentially improve the effectiveness of the proposed processing circuit and should guide future works.

Eco-friendly copper recovery process from waste printed circuit boards using Fe3+/Fe2+ redox system

2015 ◽  
Vol 40 ◽  
pp. 136-143 ◽  
Author(s):  
Szabolcs Fogarasi ◽  
Florica Imre-Lucaci ◽  
Attila Egedy ◽  
Árpád Imre-Lucaci ◽  
Petru Ilea
Keyword(s):  
Printed Circuit Boards ◽  
Recovery Process ◽  
Redox System ◽  
Copper Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

The Status Quo of Mechanical Methods Recycling Waste Printed Circuit Boards

2014 ◽  
Vol 666 ◽  
pp. 383-387
Author(s):  
Ya Wei Yang ◽  
Fu Wei Sun ◽  
Zhan Xu Tie
Keyword(s):  
Printed Circuit Boards ◽  
Electronic Waste ◽  
Recovery Process ◽  
Status Quo ◽  
Circuit Boards ◽  
Mechanical Method ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Mechanical Methods ◽  
The Status

Waste printed circuit boards is one of the main electronic waste,which has serious pollution,it has valuable metal and nometal.So its processing method is a very complex problem.There are a variety of recovery methods since the birth of waste printed circuit boards,and the most widely used method is mechanical method,which is practical and avoids the problem of environmental pollution.This article describes the recovery process of mechanical method of recycling waste printed circuit boards and the equipment used, and summarizes the status quo of mechanical method of recycling waste printed circuit boards in China and abroad.

A Novel Route for Copper Recovery from Waste Printed Circuit Boards via Mechanochemistry

2015 ◽  
Vol 768 ◽  
pp. 569-575
Author(s):  
Zhi Yuan Ou ◽  
Jin Hui Li
Keyword(s):  
Copper Sulfide ◽  
Printed Circuit Boards ◽  
Milling Time ◽  
Iron Sulfide ◽  
Xrd Analysis ◽  
Copper Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
First Time

This paper mainly introduces a novel route for copper recovery from waste printed circuit boards (WPCBs) via mechanochemistry. Copper in the crust is most commonly present as copper-iron-sulfide and copper-sulfide minerals (about 80%) and there exist many methods to extract copper from cooper ores in mineral engineering. It seems an alternative to transform the metallic components in obsolete materials to their corresponding compounds common in nature. By means of mechanochemistry, copper and sulfur were verified to form into copper sulfide in the model experiment, where, meanwhile, the optimal ball milling time was determined (20 minutes). In the real experiment, WPCB fragments and sulfur were mixed and ground for 20 minutes, no copper was detected by XRD analysis but copper sulfide was left. After leaching in sulfuric acid (3M) and hydrogen peroxide (30 wt%), the yield of copper reached nearly 95% and, also, resin was conserved for further utilization. This paper, for the first time, reports the green recovery route combining mechanical activation and sulfurization and may provide an alternative in other studies of metal recovery.

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