大学化学

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实验室含银滴定废物的绿色资源化回收

顾羽昕, 田笑丛, 姚开安   

  1. 南京大学化学学院, 化学国家级实验教学示范中心(南京大学), 江苏 南京 210023
  • 收稿日期:2026-07-03 录用日期:2026-09-10
  • 通讯作者: 姚开安, 田笑丛 E-mail:yaokaian@126.com;tianxc@nju.edu.cn Kaian Yao, Xiaocong Tian
  • 基金资助:
    2026南京大学本科实验教学质量提升计划

Green resource recovery of laboratory silver-containing waste

Yuxin Gu, Xiaocong Tian, Kaian Yao   

  1. National Demonstration Center for Experimental Chemistry Education (Nanjing University), School of Chemistry, Nanjing University, Nanjing 210023, Jiangsu Province, China
  • Received:2026-07-03 Accepted:2026-09-10
  • Contact: Kaian Yao, Xiaocong Tian E-mail:yaokaian@126.com;tianxc@nju.edu.cn

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摘要： 以氯离子-硝酸银滴定后的含银废物为原料，经预处理后采用葡萄糖和40%甲醛水溶液在碱性条件下还原制备粗银粉，并进一步熔铸成银锭，同时对实验中出现的银粉团聚、黑色黏稠物喷溅及绿色熔渣等特殊现象进行分析。X射线荧光光谱(XRF)结果显示产物以银为主，仍含少量氯及金属杂质，说明该方法可用于含银废物的初步资源化回收。

关键词: 氯化银, 银粉回收, 葡萄糖还原, 甲醛还原, 绿色资源化

Abstract: In this work, silver-containing waste generated during the argentometric titration of chloride ions with silver nitrate was used as the raw material. After pretreatment, crude silver powder was prepared under alkaline conditions using glucose and 40% formaldehyde solution as reducing agents, and was further melted and cast into silver ingots. Notable phenomena observed during the experiment, including aggregation of silver powder, splashing of a black viscous substance, and formation of green slag, were also discussed. Xray fluorescence (XRF) spectroscopy showed that the products consisted mainly of Ag, along with small amounts of Cl and metallic impurities, indicating that this method is feasible for the preliminary recovery of silver from silver-containing waste.

Key words: Silver chloride, Silver powder recovery, Glucose reduction, Formaldehyde reduction, Green resource utilization