Bioleaching waste printed circuit boards by Acidithiobacillus ferrooxidans and its kinetics aspect

Comparative study on copper leaching from waste printed circuit boards by typical ionic liquid acids

“…3, further increasing hydrogen peroxide, copper leaching rate decreases, especially for [BSO 3 HMIm]HSO 4 , which decrease from 65.01% to around 1% when hydrogen peroxide adding amount increases from 5 mL to 10 or 15 mL. This is quite different from other inorganic acid leaching system (Yang et al, 2011(Yang et al, , 2014. Overdosed hydrogen peroxide may cause the oxidation of IL acid since it decomposes to release fresh oxygen.…”

“…Since WPCBs contain many kinds of metals, such as Fe, Ni, Sn, Pb, Ag, et al, these metals may play a significant role in copper leaching process. For example, if Fe content is high, once it is leached to the solution as Fe 3+ , copper leaching rate would be accelerated by Fe 3+ , which is one of the main reasons that microbes can leaching copper out (Yang et al, 2014). Therefore, copper leaching kinetics of IL acids should be further studied.…”

“…Therefore, both traditional and advanced methods, such as mechanical-physical approaches, especially corona electrostatic separation which has obtained great success in China (Li and Xu, 2010), hydrometallurgy (Kim et al, 2011), pyrometallurgy (Zhan and Xu, 2008), bioleaching (Yang et al, 2014) and sub/supercritical fluid (Xiu and Zhang, 2010), are widely discussed for the recovery of metals form WPCBs. Among these processes, hydrometallurgic processes offer high metal selectivity and recovery with a flexible mode of operation and suitability for small scale applications, making it an attractive alternative for the treatment of WPCBs.…”

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

“…The bacterium used in this study was A. ferrooxidans SW-02 (A. ferrooxidans) (Yang et al, 2014). This bacterium was provided by the Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education (Southwest University of Science and Technology).…”

Bioleaching of copper from waste printed circuit boards by bacteria-free cultural supernatant of iron–sulfur-oxidizing bacteria

“…The toxicity of the PCBs which can affect the growth of bacteria has been thought to be the major reason of low-efficient leaching (Yang et al 2014 (Bryan et al 2015). The presence of non-metallic components in PCBs showed the bacterial toxicity in the bioleaching process .…”