The ultrasonically assisted metals recovery treatment of printed circuit board waste sludge by leaching separation

Multiple heavy metals extraction and recovery from hazardous electroplating sludge waste via ultrasonically enhanced two-stage acid leaching

“…All these studies demonstrated that ultrasonic power could enhance either extraction or leaching rates of metals, while metals themselves, even it leached more effectively, were still co-dissolved in an aqueous solution and were not separated among them so they could not be recovered as reused resource materials. Xie et al [19,20] provided an ultrasonically assisted acid leaching process to recover heavy metals from Print Circuit Board (PCB) waste sludge. The ultrasonically assisted leaching achieved a complete separation between Cu and Fe from the sludge and demonstrated that ultrasonic energy greatly enhanced metal selectivity of an acid leaching process.…”

Ultrasound-intensified Leaching of Gold from a Refractory Ore

“…20,21) The results demonstrated that ultrasound pretreatment with sodium hydroxide is a viable extractive metallurgy technique for the processing of refractory gold ores.…”

Recovery of Cu and Fe from Printed Circuit Board waste sludge by ultrasound: Evaluation of industrial application

“…Unlike prior discussed conventional heavy metal recovery processes, Xie et al [23] presented ultrasonically assisted acid leaching technique that provides a novel approach for the separation of copper and iron in PCB sludge. By using the separation technique, this study discusses a novel cleaner industrial heavy metal recovery process for copper and iron recovery from PCB sludge.…”

“…Impure [23] shows different leaching efficiencies of copper and iron of the PCB sludge processed by the ultrasonic assisted leaching approach after applying an ultrasonic generator of 160 W in 1-l volume at 25 C for 60 min. As Fig.…”

“…In this work, we further applied the technique in an industrial scale to establish a novel cleaner process for industrial recycling of the waste sludge metals. The detailed procedure of the ultrasonic leaching separation of waste sludge metals in a 1-l tank and the affection of the ultrasonic power, leaching time and final leaching pH on the leaching efficiencies were presented in the former paper [23]. Differing from foregoing one, this paper mainly focus on the characters such as recovery efficiency, cost, product, waste discharge, etc., of the whole industrial process for recovery of copper and iron from PCB waste sludge in which the ultrasonic leaching technique is applied as its separation steps.…”