Biotechnology Group, Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran.
J Environ Manage. 2021 Feb 15;280:111642. doi: 10.1016/j.jenvman.2020.111642. Epub 2020 Dec 5.
Improving the bioleaching efficiency of metals from spent mobile phone printed circuit boards (PCBs) in a short time has been of major interest in recent years. In this paper, a novel cheap catalyst (oak wood biochar) was used to improve the copper and nickel bioleaching efficiency from spent mobile phone PCBs. The biochar was derived from oak wood through slow pyrolysis at a low temperature of 500 °C for 1h. The results of RSM optimization indicated that the optimum conditions to maximize copper and nickel recovery were 1.6 g/L biochar and 16 g/L pulp density. The findings indicated that compared to without the presence of biochar, the leach yields of copper and nickel were high. As much as 98% of copper and 82% of nickel were leached by indirect bioleaching under optimum conditions. The better performance in the presence of biochar is due to both galvanic interactions between biochar and solid waste. The biochemical characterization of bioleaching solution suggested that the high concentration of biochar (> 1.6 g/L) led to copper absorption by functional groups on the surface of biochar. Compared to chemical leaching, the bioleaching has better performance. Under optimum conditions, the copper and nickel recovery by indirect bioleaching was 36% and 64% more than that by chemical leaching. Also, it is found that biochar has a positive effect on the chemical leaching process. Therefore, in this paper, the function of biochar was elaborated not only in bio-hydrometallurgy but also in the hydrometallurgy process.
近年来，如何在短时间内提高从废旧手机印刷电路板（PCB）中浸取金属的生物浸出效率一直是研究的重点。本文使用一种新型廉价催化剂（橡木生物炭）来提高从废旧手机 PCB 中浸取铜和镍的效率。生物炭是通过在 500°C 的低温下缓慢热解 1 小时从橡木中得到的。响应面法优化结果表明，最大限度地提高铜和镍回收率的最佳条件是 1.6 g/L 生物炭和 16 g/L 浆体密度。结果表明，与不存在生物炭相比，铜和镍的浸出率较高。在最佳条件下，间接生物浸出可浸出高达 98%的铜和 82%的镍。在生物炭存在下表现出更好的性能是由于生物炭和固体废物之间的电偶相互作用。生物浸出液的生物化学特性表明，生物炭浓度较高（>1.6 g/L）会导致铜被生物炭表面的官能团吸收。与化学浸出相比，生物浸出具有更好的性能。在最佳条件下，间接生物浸出回收的铜和镍比化学浸出分别多 36%和 64%。此外，还发现生物炭对化学浸出过程有积极影响。因此，在本文中，不仅阐述了生物炭在生物湿法冶金中的作用，还阐述了其在湿法冶金过程中的作用。
