High temperature investigations on optimising the recovery of copper from waste printed circuit boards

2018 ◽  
Vol 73 ◽  
pp. 556-565 ◽  
Author(s):  
R. Cayumil ◽  
M. Ikram-Ul-Haq ◽  
R. Khanna ◽  
R. Saini ◽  
P.S. Mukherjee ◽  
...  
2012 ◽  
Vol 32 (3) ◽  
pp. 568-574 ◽  
Author(s):  
Mingjiang Ni ◽  
Hanxi Xiao ◽  
Yong Chi ◽  
Jianhua Yan ◽  
Alfons Buekens ◽  
...  

2018 ◽  
Vol 78 ◽  
pp. 602-610 ◽  
Author(s):  
R. Khanna ◽  
G. Ellamparuthy ◽  
R. Cayumil ◽  
S.K. Mishra ◽  
P.S. Mukherjee

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1697
Author(s):  
Yongjun Meng ◽  
Yongjie Liao ◽  
Zhirong Liu ◽  
Jing Chen ◽  
Xiaolong Yang ◽  
...  

Improper handling of waste printed circuit boards (PCBs) can cause serious pollution to the water and soil environments. In order to explore a new method of recycling waste PCBs, this study investigated the effect of PCBs and butadiene styrene rubber (SBR) on the rheological properties of neat bitumen. The dynamic shear rheological (DSR) test was used to study the effect of different PCB contents on the high-temperature rheological properties of SBR-modified bitumen. Fluorescence microscopy and Fourier-transform infrared spectroscopy were used to study the microstructure change law and modification mechanism of PCB and SBR composite modified bitumen. Finally, the feasibility of the bitumen properties was verified through a test of the bituminous mixture properties. The DSR test results showed that the addition of PCBs improves the elastic recovery modulus, dynamic shear modulus, and rutting factor of SBR-modified bitumen, indicating that the high-temperature properties were improved. Infrared spectroscopy analysis revealed that a new absorption peak was generated in the infrared spectrum of the compound bitumen after the addition of PCBs, and the intensity of the original absorption peak also changed, indicating that PCBs and SBR-modified bitumen were mainly physically blended and accompanied by a weak chemical reaction. It was further found that the absorption peak of the unsaturated C=C double bond was significantly enhanced, and the increase in the content of the unsaturated bond C=C in the main chain of the polymer significantly increases the stiffness of the bitumen. Macroscopically, the high-temperature rutting resistance was improved to a certain extent. The fluorescence diagram shows that when PCBs do not exceed 10%, the PCBs can form a homogeneous structure and be dispersed in SBR-modified bitumen. The road test of PCBs and SBR composite modified bituminous mixtures showed that PCBs can significantly improve the rutting resistance and water stability of SBR-modified bitumen at high temperatures at the recommended optimum content. The crack resistance at low temperatures is weakened but still meets actual engineering requirements. The correlation analysis between the properties of bitumen and bituminous mixtures is carried out based on grey correlation theory. The results show that the index of modified bitumen has a very good guiding effect on the bituminous mixture properties. The development of PCBs and SBR composite-modified bitumen provides a new practical method for recycling waste PCBs.


2018 ◽  
Vol 199 ◽  
pp. 831-839 ◽  
Author(s):  
Long Meng ◽  
Yiwei Zhong ◽  
Lei Guo ◽  
Zhe Wang ◽  
Kuiyuan Chen ◽  
...  

2013 ◽  
Vol 423-426 ◽  
pp. 904-908 ◽  
Author(s):  
Song Bai Wang ◽  
Chang Ming Cheng ◽  
Wei Lan ◽  
Ren Wu Zhou ◽  
Xian Hui Zhang ◽  
...  

This paper estimates the electrical energy loss on high-temperature plasma processing waste printed circuit boards. Using three plasma torch powers in big output power (60W) and a plasma torch power in relatively small output power (30W), after 4.5 hours of high-temperature plasma incineration, 43 kilograms of waste printed circuit boards was successively fused at high temperature plasma incinerator. After calculating, the total electrical energy loss for four powers was about 1,070 kilowatts hours during sample incineration.


2014 ◽  
Vol 13 (10) ◽  
pp. 2601-2607 ◽  
Author(s):  
Jae-chun Lee ◽  
Manoj Kumar ◽  
Min-Seuk Kim ◽  
Jinki Jeong ◽  
Kyoungkeun Yoo

JOM ◽  
2020 ◽  
Author(s):  
Joona Rajahalme ◽  
Siiri Perämäki ◽  
Roshan Budhathoki ◽  
Ari Väisänen

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%.


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