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<p>The growth in technology has led to an increase in Waste Electrical and Electronic Equipment, with waste Printed Circuit Boards (wPCBs) accounting for a significant fraction. The epoxy resin layer on wPCBs impedes leaching, necessitating a pretreatment step. This study evaluates the comparative effect of sodium hydroxide (NaOH) soaking and heat pretreatment on three leaching approaches: one-step, two-step, and glycine leaching. Results showed that NaOH pretreatment followed by a two-step leaching process yielded the highest Au recovery (0.275&#xa0;mg/L). In contrast, the highest Pd recovery (0.465&#xa0;mg/L) was obtained under ‘no pretreatment’ conditions. These results emphasize the importance of pretreatment and the selection of an appropriate leaching process for the efficient recovery of precious metals from wPCBs. The study’s findings can serve as a basis for applying similar recovery approaches to other types of e-waste, thereby improving the circularity of precious metals in their supply chains and supporting sustainable e-waste management.</p>

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Performance Assessment of Pretreatment Techniques and Three Leaching Approaches Focusing Au and Pd Recovery from Waste Printed Circuit Boards (wPCBs)

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Vikas Hitendrasinh Rathod,
  • U. Rambabu,
  • Ambika Selvaraj

摘要

The growth in technology has led to an increase in Waste Electrical and Electronic Equipment, with waste Printed Circuit Boards (wPCBs) accounting for a significant fraction. The epoxy resin layer on wPCBs impedes leaching, necessitating a pretreatment step. This study evaluates the comparative effect of sodium hydroxide (NaOH) soaking and heat pretreatment on three leaching approaches: one-step, two-step, and glycine leaching. Results showed that NaOH pretreatment followed by a two-step leaching process yielded the highest Au recovery (0.275 mg/L). In contrast, the highest Pd recovery (0.465 mg/L) was obtained under ‘no pretreatment’ conditions. These results emphasize the importance of pretreatment and the selection of an appropriate leaching process for the efficient recovery of precious metals from wPCBs. The study’s findings can serve as a basis for applying similar recovery approaches to other types of e-waste, thereby improving the circularity of precious metals in their supply chains and supporting sustainable e-waste management.