Martina Laubertová, Bora Derin, Jarmila Trpčevská, Klaudia Šándorová, Emília Sminčáková
Metals Recovery: Study of the Kinetic Aspects of Copper Acidic Leaching Waste Printed Circuit Boards from Discarded Mobile Phones
Číslo: 3/2019
Periodikum: Acta Montanistica Slovaca
Klíčová slova: copper, metallurgy, leaching, discarded mobile phones
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Anotace:
This study was performed to investigate the possibility of copper recovery from the waste printed circuit boards (WPCBs) of waste
mobile phones using a hydrometallurgical route as cleaner technology for environmental protection. In recycling, elements such as copper
and aluminium are recovered, as well as the precious metals gold, silver, platinum and palladium, which can be recouped profitably from
electronic waste and make this waste very valuable for recycling. In the experiments, the conventional agitated acid leaching method was
used for mechanically pre-treated WPCBs with a mean Cu content of 19.09 wt % in a sulphuric acid medium with the presence of Fe3+ as an
oxidant. The effects of Fe2(SO4)3 concentration, leaching time, temperature and the ratio of liquid to solid phase on the recovery of copper
from the solutions were studied. The highest Cu extraction was achieved at 363 K after 15 min of leaching, and a liquid to solid ratio (L/S)
of 20. The value of activation energy (Ea), which was found to be ~14.87 kJ.mol-1, indicates that this process is diffusion controlled. The
apparent order of reaction with regard to the initial Fe2(SO4)3 concentration at 313 K was calculated as 0.55. The proposed scheme of
copper recovery from WPCBs of mobile phones was designed.
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mobile phones using a hydrometallurgical route as cleaner technology for environmental protection. In recycling, elements such as copper
and aluminium are recovered, as well as the precious metals gold, silver, platinum and palladium, which can be recouped profitably from
electronic waste and make this waste very valuable for recycling. In the experiments, the conventional agitated acid leaching method was
used for mechanically pre-treated WPCBs with a mean Cu content of 19.09 wt % in a sulphuric acid medium with the presence of Fe3+ as an
oxidant. The effects of Fe2(SO4)3 concentration, leaching time, temperature and the ratio of liquid to solid phase on the recovery of copper
from the solutions were studied. The highest Cu extraction was achieved at 363 K after 15 min of leaching, and a liquid to solid ratio (L/S)
of 20. The value of activation energy (Ea), which was found to be ~14.87 kJ.mol-1, indicates that this process is diffusion controlled. The
apparent order of reaction with regard to the initial Fe2(SO4)3 concentration at 313 K was calculated as 0.55. The proposed scheme of
copper recovery from WPCBs of mobile phones was designed.