metals extraction
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Recycling ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 67
Author(s):  
Guadalupe Martinez-Ballesteros ◽  
Jesus Leobardo Valenzuela-García ◽  
Agustin Gómez-Alvarez ◽  
Martin Antonio Encinas-Romero ◽  
Flerida Adriana Mejía-Zamudio ◽  
...  

Reclamation of printed circuit boards (PCBs) to recover metals is gaining growing attention due to minerals being non-renewable resources. Currently, metals extraction from PCBs through an efficient and green method is still under investigation. The present investigation concerns the recycling of printed circuit boards using hydrometallurgical processes. First, the basic metals (Cu, Ni, Zn and Fe) were separated using a sulfuric acid solution at moderate temperatures. The remaining solids were characterized by SEM-EDS, whereby a high content of precious metals (Au, Ag and Pt) was observed. In the second stage, solids were leached with a solution of HCl and NaClO in a 1-L titanium reactor with varied oxygen pressure (0.2, 0.34 and 0.55 MPa), temperature (40, 50 and 80 °C) and concentration of HCl (2 and 4 M), obtaining extractions above 95% at [HCl] = 4 M, P = 0.34 MPa and T = 40 °C. The extraction increased depending on the concentration of HCl. Eh–pH diagrams for Ag–Cl–H2O, Au–Cl–H2O and Pt–Cl–H2O were constructed to know the possible species in the solution.


2020 ◽  
Vol MA2020-02 (15) ◽  
pp. 1414-1414
Author(s):  
Antoine Allanore
Keyword(s):  

2020 ◽  
pp. 125039
Author(s):  
Mohammad A. Al-Ghouti ◽  
Mariam Khan ◽  
Mustafa S. Nasser ◽  
Khalid Al Saad ◽  
Oon Ee Heng

PLoS ONE ◽  
2020 ◽  
Vol 15 (10) ◽  
pp. e0239412
Author(s):  
Mohammad A. Al-Ghouti ◽  
Mariam Khan ◽  
Mustafa S. Nasser ◽  
Khalid Al Saad ◽  
O. O. N. Ee Heng

2020 ◽  
Vol 977 ◽  
pp. 190-194
Author(s):  
Andrey Antonov ◽  
Nikolay Samotaev ◽  
Andreas Tietz ◽  
Denis Veselov ◽  
Andrey Kirichenko

Modern methods of recycling spent automotive catalysts and their main disadvantages in industrial practice are considered. The electrochlorination method is proposed as the basis of the platinum-group metals extraction technology after electric arc melting of ceramic catalysts carrier material. The results of the experimental work on the extraction of platinum, palladium, rhodium are analyzed.


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