Abstract The generation of electronic waste (e-waste) is an issue with global consequences and therefore the proper management and recycling of e-waste are of increasing importance. Printed circuit boards (PCBs), which are a common component of e-waste, have a high valuable metal content which also makes this material an important secondary resource. In this study, biohydrometallurgical extraction of metals from PCBs was investigated as a potential alternative to conventional hydrometallurgical or pyrometallurgical processing options. An indirect non-contact leaching approach using ferric iron generated by Acidithiobacillus ferrooxidans was compared to chemical ferric sulfate leaching of Cu, Ni, Zn and Al from milled high-grade PCBs at 1% pulp density at Fe3+ concentrations of 5–20 g L−1 and at a pH range of 0.6–1.2. The roles of redoxolysis and acidolysis were examined by comparing ferric leaching with sulfuric acid leaching conducted at initial pH values of 0.8–1.4. Results showed that the supplementation of ferric iron significantly (p

中文翻译：

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使用生物和化学助滤剂从印刷电路板中浸出金属的潜力

摘要 电子垃圾（e-waste）的产生是一个具有全球影响的问题，因此对电子垃圾的适当管理和回收变得越来越重要。印刷电路板 (PCB) 是电子垃圾的常见组成部分，其有价值的金属含量很高，这也使这种材料成为重要的二次资源。在这项研究中，研究了从多氯联苯中生物湿法冶金提取金属作为传统湿法冶金或火法冶金加工方案的潜在替代方案。使用由氧化亚铁硫杆菌产生的三价铁的间接非接触浸出方法与化学硫酸铁从研磨的高级 PCB 中以 1% 的纸浆密度在 5–20 g L− 的 Fe3+ 浓度下浸出 Cu、Ni、Zn 和 Al 的方法进行了比较1 且 pH 值范围为 0.6–1.2。通过比较在 0.8-1.4 的初始 pH 值下进行的三价铁浸出和硫酸浸出，研究了氧化还原和酸解的作用。结果表明，三价铁的补充显着（p