Reverse flotation efficiency and mechanism of various collectors for recycling waste printed circuit boards. (15th February 2020)

• Record Type: Journal Article
• Authors: Yao, Yake; Bai, Qiang; He, Jingfeng; Zhu, Lingtao; Zhou, Kui; Zhao, Yuemin
• Is Part Of: Waste management. Volume 103(2020)
• Page Start: 218
• Page End: 227
• Publication Date: 2020-02-15
• Subjects: Waste printed circuit boards -- Reverse flotation -- Environmental disposal -- Separation mechanism -- Metals recovery; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2019.12.030
• Languages: English
• ISSNs: 0956-053X

Abstract

Graphical abstract: Highlights: Reverse flotation was introduced to process waste printed circuit boards. Effects of various operational factors on flotation efficiency were investigated. The separation mechanism of reverse flotation was clarified. Reverse flotation presented feasible and environmental advantages. Abstract: Reverse flotation was used to recover metal components from waste printed circuit boards (PCBs). The micro-morphology and chemical composition analysis of raw materials indicated that waste PCBs are mainly composed of glass fibers, ceramics and valuable metals. The effects of collector dosage and temperature on flotation efficiency were investigated and evaluated. The flotation results using various collectors showed that the efficient recovery of metal components could be achieved via reverse flotation with the diesel oil (DO) dosage of 370–1110 g/t, composite collector (CC) dosage of 370–740 g/t and laurylamine (LAM) dosage of 740 g/t, respectively. The suitable temperature should be controlled at around 20 °C for these collectors. The results also indicated that the selectivity of DO for nonmetal particles was stronger than that of CC and LAM. In summary, reverse flotation is a feasible and environmental approach for disposal of waste PCBs.