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废弃电路板中金的浸取研究
Study on Leaching of Gold from Abandoned Circuit Board
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- DOI:
- 作者:
- 石开仪 张凌峰 丁伟丽
SHI Kaiyi;ZHANG Lingfeng;DING Weili
- 作者单位:
- 六盘水师范学院化学与材料工程学院 煤系固体废弃物资源化利用特色重点实验室
Department of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui 553004,China;Characteristic Key Laboratory of Coal Series Solid Waste Recycling Utilization,Liupanshui 553004,China
- 关键词:
- 电子废弃物 浸取 贵金属 金
e-waste leaching precious metal gold
- 摘要:
- 为回收电子废弃物中的贵金属金,先对废弃电路板进行破碎、焚烧得到灰渣,用原子吸收法对灰渣中的金等元素进行测定;然后用盐酸和硝酸对灰渣中的贱金属进行溶解,用盐酸和氯酸钠对金进行溶解;最后用X-射线光电能谱对粉末金进行分析。结果发现,电路板灰渣中金、铅、镉、铬的平均含量分别为0.097 2、5.164 9、0.003 9和0.099 7 mg/g;盐酸和氯酸钠浓度越高,金的提取率越高;当盐酸浓度和氯酸钠浓度分别为3.0 mol/L和12 g/L时,粉末金的提取率为71.40%;粉末金中含有大量纯金和少量主要为SiO2的杂质。In order to recover the precious metal gold in the electronic waste, the waste circuit board was firstly broken and burned to get the ash residue, and the gold and other elements in the ash residue were determined by atomic absorption method. Then hydrochloric acid and nitric acid were used to dissolve the base metal in the ash residue, and hydrochloric acid and sodium chlorate were used to dissolve the gold. Finally, the powder gold was analyzed by X-ray photoelectric spectroscopy. The results show that the average contents of gold, lead, cadmium and chromium in the board slag are 0.0972, 5.1649, 0.0039 and 0.099 7 mg/g, respectively. The higher the concentration of hydrochloric acid and sodium chlorate,the higher the extraction rate of gold. When the concentration of hydrochloric acid and sodium chlorate is 3.0 mol/L and 12 g/L respectively, the extraction rate of gold powder is 71.40%. Powder gold contains a large amount of pure gold and a small amount of impurities mainly SiO2.