Recycling of metals from pretreated waste printed circuit boards effectively in stirred tank reactor by a moderately thermophilic culture
Section snippets
A brief procedure description for this study
The main experimental design is shown in Fig. 1. Firstly, powdered PCBs is divided to RPCBs and PPCBs by shaking table separation, and the former containing metal concentrates can be processed by pyrometallurgy directly. Then PPCBs as low-grade material will be bioleached to extract residual metals at a relatively high pulp density by adapted moderate thermophiles.
Pretreatment of PCBs by sharking table separation
The waste printed circuit mother boards were obtained from electronics shop in Changsha, China. No physical or mechanical separation
Pretreatment of PCBs by table separation
For the pretreatment of PCBs, table separator was used to separate the plastics and metals. After separation, most of the metals were concentrated to RPCBs, whereas still a few metals remained in PPCBs. The content of metals in each fraction is shown in Table 2. It can be seen that only 8.83% total metal remained in PPCBs, compared with RPCBs (80.17% total metal). Thus PPCBs is not suitable for pyrometallurgical process, but bioleaching seems to be a feasible way for recycling.
Adaptation of microorganisms in PPCBs
To improve the
Acknowledgments
This work was supported by the National Natural Science Foundation of China (NSFC) (Nos. 31470230 and 51320105006), the Planned Science and Technology Project of Hunan Province, China (No. 2013FJ4068), and Australia CSIRO OCE Science Leader Grant.
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2023, Role of Green Chemistry in Ecosystem Restoration to Achieve Environmental SustainabilityExperimental investigation on the production of hydrogen from discarded circuit boards in supercritical water
2022, International Journal of Hydrogen EnergyCitation Excerpt :The most commonly used waste circuit board treatment technologies are the mechanical physical method [6,7], pyrometallurgy [8,9], hydrometallurgy [10–14], and so forth. Some novel technologies such as biological treatment [9,15], supercritical research using the fluid method [9,16–19], the photocatalysis method [20], the hydrothermal liquefaction [21] and the plasma method [22] have been reported in recent years. Among these reported methods, the supercritical water gasification technology method can be used to recycle both the metals and resins in waste circuit boards, making it a good choice for the disposal of waste circuit boards.