Column bioleaching copper and its kinetics of waste printed circuit boards (WPCBs) by Acidithiobacillus ferrooxidans

Chemosphere ◽  
2015 ◽  
Vol 141 ◽  
pp. 162-168 ◽  
Author(s):  
Shu Chen ◽  
Yuankun Yang ◽  
Congqiang Liu ◽  
Faqin Dong ◽  
Bijun Liu
Keyword(s):  
Acidithiobacillus Ferrooxidans ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Kinetics Of

scholarly journals Characteristics of Metals Leached from Waste Printed Circuit Boards Using Acidithiobacillus ferrooxidans

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 224
Author(s):  
Jinsung An
Keyword(s):  
Acidithiobacillus Ferrooxidans ◽  
Printed Circuit Boards ◽  
Cost Effective ◽  
Low Grade ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Iron Oxidizing Bacteria ◽  
Valuable Metals ◽  
Leaching Characteristics

The aim of this study was to compare leaching characteristics of metals from printed circuit boards (PCBs), taken from waste electrical and electronic equipment in the presence and in the absence of the iron-oxidizing bacteria, Acidithiobacillus ferrooxidans. A. ferrooxidans not only increases the leached concentration of Cu from the PCBs, but also inhibits the components of the 0K medium and leached Cu from forming precipitates such as libethenite (Cu2(PO4)(OH)), thereby assisting Cu recovery from the PCBs. In addition, the leached concentration of Pb from PCBs decreased in the presence of A. ferrooxidans, due to Pb forming amorphous precipitates. It is expected that Pb is not highly toxic to A. ferrooxidans. Consequently, A. ferrooxidans can be used as a cost-effective and environmentally friendly way to leach out valuable metals from PCBs as low-grade urban ore.

Kinetic study on the slow pyrolysis of nonmetal fraction of waste printed circuit boards (NMF-WPCBs)

2020 ◽  
Vol 38 (8) ◽  
pp. 903-910 ◽  
Author(s):  
Zhitong Yao ◽  
Jingjing Xiong ◽  
Shaoqi Yu ◽  
Weiping Su ◽  
Weihong Wu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Model Free ◽  
Waste Printed Circuit Boards ◽  
Three Stages ◽  
Fwo Method ◽  
Pyrolysis Behaviour ◽  
Kinetics Of

In this study, the pyrolysis behaviour of nonmetal fraction of waste printed circuit boards (NMF-WPCBs) was studied based on five model-free methods and distributed activation energy model (DAEM). The possible decomposition mechanism was further probed using the Criado method. Thermogravimetric analysis indicated that the NMF-WPCBs pyrolysis process could be divided into three stages with temperatures of 37–330°C, 330–380°C and 380–1000°C. The mass loss at different heating rate was determined as 26.85–29.98%, 13.47–24.21% and 20.43–23.36% for these stages, respectively. The activation energy ( Eα) from various model-free methods first increased with degree of conversion ( α) increasing from 0.05 to 0.275, and then decreased beyond this range. The coefficient ( R) from the Flynn–Wall–Ozawa (FWO) method was higher, and the resulting Eα fell into the range of 214.947–565.660 kJ mol−1. For the DAEM method, the average Eα value was determined as 337.044 kJ mol−1, comparable with 329.664 kJ mol−1 from the FWO method. The thermal decomposition kinetics of NMF-WPCBs could be better described by the second-order reaction.

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