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| 中性环境中硫氰酸盐浸取废旧线路板中的金 |
| Gold Leaching from Waste Circuit Boards with Thiocyanate in Neutral Environment |
| 投稿时间：2015-05-07 |
| DOI： |
| 中文关键词: 有色金属冶金 废印刷线路板 金 硫氰酸盐 双氧水 |
| 英文关键词: nonferrous metallurgy waste PCBs gold thiocyanate hydrogen peroxide |
| 基金项目:山东省自然科学基金项目(ZR2013EEM008)；清华大学固体废物处理重点实验室项目(swmes 2011-02)。 |
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| 中文摘要: |
| 由于贵金属资源稀缺，从二次资源中回收利用金等贵金属成为趋势。研究了一种在中性环境中提取废旧线路板(WPCBs)中金的新方法。将预处理(去除铜等贱金属)后的废旧线路板粉末加入到0.8 mol/L的络合剂硫氰酸铵溶液中，调pH至中性，通过添加氧化剂30%双氧水，在固液比为1:40，双氧水用量为1.5 mL，温度为20℃、振荡速度300 r/min、反应1 h条件下，金浸出率可达96%。 |
| 英文摘要: |
| Because of the increasing scarce of precious metals, recycling gold and other precious metals from secondary resources has become a trend. A new method to extract gold from waste printed circuit boards (WPCBs) in neutral environment was explored. After pretreatment (removal of copper and other base metals), the waste PCBs powder was mixed with 0.8 mol/L ammonium thiocyanate solution, and then pH of the solution was adjusted to neutral. Ammonium thiocyanate served as a complexing agent. The gold leaching rate reached 96%, when the solid-liquid ratio was 1:40, the dosage of hydrogen peroxide was 1.5 mL, the temperature was 20, the oscillation speed was 300 r/min, and the reaction time was 1 h. |
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