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The growth of waste electrical and electronic equipment has intensified the search for effective recovery technologies of valuable metals from printed circuit boards (PCBs). In this study, the hydrometallurgical behavior and recovery potential of nickel from thermally treated PCB were investigated. The PCB waste was subjected to steam gasification as a pretreatment step, followed by mechanical separation and subsequent leaching using different acidic media, including 2 M sulfuric acid, aqua regia, and dilute acids assisted by ultrasonic treatment. The results indicate that thermal pretreatment improves the accessibility of nickel-bearing phases and promotes their dissolution during hydrometallurgical processing. Leaching efficiency depended on the leaching agent and particle size. Ultrasound-assisted leaching with dilute acids further enhanced nickel extraction.
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Ceglińska et al. (2026) studied this question.
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