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Pyrometallurgy coupling bioleaching for recycling of waste printed circuit boards
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2021-11-06 , DOI: 10.1016/j.resconrec.2021.106018
Huichao Chu 1 , Can Qian 1 , Bingyang Tian 1 , Shiyue Qi 1 , Jia Wang 2 , Baoping Xin 1
Affiliation  

The pyrometallurgy coupling indirect bioleaching strategy is proposed for the recycling of WPCBs to avoid the disadvantages of time-consuming, low processing power, and relatively low efficiency of conventional bioleaching. The results show that under the pulp density of 2.5% (w/v), the low content (0.26 wt.%) of Ni in the raw WPCBs is completely extracted by indirect bioleaching, while the release rate of a high content (24.52 wt.%) of Cu is only 46.9%. However, the calcination pretreatment significantly improves Cu release by indirect bioleaching, and 100% Cu extraction is attained from the 600 °C-treated WPCBs at the high pulp density of 5.0% due to the formation of tractable CuO. Conversely, the release of Ni is inhibited by calcination evidently, and the indirect bioleaching efficiency of Ni declines from 34.9% to 10.1% when the pulp density lifts from 2.5% to 10.0% because of the formation of NiO with lower kinetics of acid-dissolution. On the other hand, due to the complete removal of Cu and the formation of insoluble NiO, the toxicity and environmental risk analysis indicates that the bioleaching residue of the 600 °C-treated WPCBs at the pulp density of 5.0% is completely detoxified and can be reused as non-hazardous materials safely, while the combination of the calcination and indirect bioleaching significantly reduces the environmental risk associated with the WPCBs. These findings provide the theoretical basis for a perfect combined process of pyrometallurgy and bioleaching for tackling the WPCBs from a technological perspective.



中文翻译:

火法冶金耦合生物浸出回收废印刷电路板

针对WPCBs的回收利用,提出了火法耦合间接生物浸出策略,避免了传统生物浸出耗时、处理能力低、效率相对较低的缺点。结果表明,在 2.5% (w/v) 的纸浆密度下,WPCBs 原料中低含量 (0.26 wt.%) 的 Ni 被间接生物浸出完全提取,而高含量 (24.52 wt. .%) 的 Cu 仅为 46.9%。然而,煅烧预处理通过间接生物浸出显着改善了铜的释放,并且由于形成了易处理的 CuO,在 5.0% 的高纸浆密度下,600°C 处理的 WPCB 实现了 100% 的铜提取。相反,焙烧明显抑制了Ni的释放,Ni的间接生物浸出效率从34.9%下降到10%。1% 当纸浆密度从 2.5% 提升到 10.0% 时,因为形成了具有较低酸溶解动力学的 NiO。另一方面,由于铜的完全去除和不溶性NiO的形成,毒性和环境风险分析表明,600℃处理的WPCBs在5.0%的纸浆密度下的生物浸出残留物完全脱毒,可以可作为无害材料安全地再利用,而煅烧和间接生物浸出的结合显着降低了与 WPCB 相关的环境风险。这些发现为从技术角度解决 WPCBs 的火法冶金和生物浸出的完美结合提供了理论基础。由于完全去除Cu并形成不溶性NiO,毒性和环境风险分析表明,600°C处理的WPCBs在5.0%纸浆密度下的生物浸出残留物完全脱毒,可作为非危险材料安全,而煅烧和间接生物浸出的结合显着降低了与 WPCB 相关的环境风险。这些发现为从技术角度解决 WPCBs 的火法冶金和生物浸出的完美结合提供了理论基础。由于完全去除Cu并形成不溶性NiO,毒性和环境风险分析表明,600°C处理的WPCBs在5.0%纸浆密度下的生物浸出残留物完全脱毒,可作为非危险材料安全,而煅烧和间接生物浸出的结合显着降低了与 WPCB 相关的环境风险。这些发现为从技术角度解决 WPCBs 的火法冶金和生物浸出的完美结合提供了理论基础。0% 是完全无毒的,可以作为无害材料安全地再利用,而煅烧和间接生物浸出的结合显着降低了与 WPCB 相关的环境风险。这些发现为从技术角度解决 WPCBs 的火法冶金和生物浸出的完美结合提供了理论基础。0% 是完全无毒的,可以作为无害材料安全地再利用,而煅烧和间接生物浸出的结合显着降低了与 WPCB 相关的环境风险。这些发现为从技术角度解决 WPCBs 的火法冶金和生物浸出的完美结合提供了理论基础。

更新日期:2021-11-07
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