Lv Xiang, Wu Qinqin, Huang Xiaobing, Wu Ling Ling, Hu Lin, Fei Peng, Liu Tian Ming, Yu Qing
School of Resources, Environment and Safety Engineering, University of South China, Hengyang421001, China.
Key Discipline Laboratory of Defense Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang421001, China.
ACS Omega. 2023 Jan 5;8(2):2575-2585. doi: 10.1021/acsomega.2c07102. eCollection 2023 Jan 17.
The use of efficient and clean methods for the recycling of waste circuit boards is an ongoing challenge. In this research, the effect of microwave pretreatment on the leaching and enrichment of copper from waste print circuit board (WPCB) was studied. The morphology and chemical structure of WPCB particles before and after microwave pretreatment were analyzed by SEM/EDS and Fourier infrared spectroscopy. Leaching experiments and copper enrichment tests were designed to investigate the effect of different microwave irradiation powers and microwave irradiation times on the copper leaching rate and copper enrichment rate in WPCB. The leaching experiment results showed that microwave pretreatment can effectively improve the leaching rate of WPCB. When the microwave irradiation power was 700 W, the irradiation time was 120 s, and the leaching time was 15 min, the copper leaching rate in WPCB was 57.01%, which was 24.34% higher than that in the untreated condition. The results of copper enrichment experiment show that microwave pretreatment can effectively improve the copper enrichment of WPCB. After microwave pretreatment, copper was effectively enriched in the 4-2 and 2-1 mm particle sizes. When the microwave irradiation time was 120 s, the copper enrichment rates in the 4-2 and 2-1 mm particle sizes were 1.74 and 1.66, which increased by 0.63 and 0.32, respectively, compared to the untreated condition. Microwave pretreatment enables the effective separation of metallic copper from non-metallic components in WPCB, increasing the exposure area of copper and promoting the monomer separation of copper, thus improving the leaching and enrichment of copper.
采用高效清洁的方法回收废电路板是一项持续的挑战。本研究考察了微波预处理对废印刷电路板（WPCB）中铜浸出和富集的影响。通过扫描电子显微镜/能谱仪（SEM/EDS）和傅里叶红外光谱对微波预处理前后WPCB颗粒的形貌和化学结构进行了分析。设计浸出实验和铜富集试验，研究不同微波辐射功率和微波辐射时间对WPCB中铜浸出率和铜富集率的影响。浸出实验结果表明，微波预处理能有效提高WPCB的浸出率。当微波辐射功率为700W、辐射时间为120s、浸出时间为15min时，WPCB中铜的浸出率为57.01%，比未处理时提高了24.34%。铜富集实验结果表明，微波预处理能有效提高WPCB的铜富集效果。微波预处理后，铜有效地富集在粒径为4-2mm和2-1mm的颗粒中。当微波辐射时间为120s时，粒径为4-2mm和2-1mm颗粒的铜富集率分别为1.74和1.66，与未处理时相比分别提高了0.63和0.32。微波预处理能够使WPCB中的金属铜与非金属成分有效分离，增加铜的暴露面积，促进铜的单体解离，从而提高铜的浸出和富集效果。
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