(1. 中国科学院 青岛生物能源与过程研究所，中国科学院生物基材料重点实验室，青岛 266100；
2. 青岛理工大学 环境与市政工程学院，青岛 266520；
3. 北京科技大学 冶金与生态工程学院，北京 100083；
4. 招金矿业股份有限公司 金翅岭金矿，招远 265400；
5. 江西省汉氏贵金属公司，上饶 334000)
摘 要: 介绍一种鼓泡油膜萃取法处理氰化提金废水的新方法。结果表明：鼓泡油膜萃取法不仅可回收废水中高浓度的铜，还可经济回收极低浓度的金。废水中铜的脱除率达99%，金的萃取率达99%，氰根脱除率达91.9%。萃余液可返回选矿工艺重复利用，实现含氰废水的零排放。负载有机相经酸性硫脲反萃后可循环使用。采用锌粉置换法回收硫脲反萃余液中的金和铜。锌粉置换渣采用稀酸溶解法可实现金和铜的分离。金的总回收率达98.06%，铜的总回收率达94.74%。锌粉置换后液可制备硫化锌产品，锌回收率达96%。该工艺成本低，绿色环保，具有潜在的应用推广前景。
关键字: 金；溶剂萃取；鼓泡；有机液膜；氰化提金废水
（1. CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266100, China;
2. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China;
3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
4. Jinchiling Gold Mining, Zhaojin Mining in Dustry Co., Ltd., Zhaoyuan 265400, China;
5. Jiangxi Province Han’s Precious Metals Co., Ltd., Shangrao 334000, China）
Abstract:A new process based on gas bubble supported organic liquid membrane extraction technology was suggested to treat the auro-cyanide wastewaters. The results show that, not only the high-concentration copper(Ⅰ) in the auro-cyanide wastewaters can be recovered satisfactorily, but the very low concentration gold(Ⅰ) can also be extracted efficiently by the suggested gas bubble supported organic liquid membrane extraction technology. The percent recovery of copper(Ⅰ), gold(Ⅰ) and cyanide can reach 99%, 99%, and 91.9%, respectively. The raffinates after bubbling extraction can be returned back to the mineral separation process for reusing and recycling in the factories, so that almost zero discharge of the cyanide wastewaters comes true. The Cu(Ⅰ) and Au(Ⅰ) in the loaded organic phase can be stripped by acidic thiourea, and then the regenerated organic phase can be returned back for reusing. Zinc powder is used to recover gold(？) and copper(？) in the thiourea solutions. Then, gold and copper can be separated by two-steps of dissolving the zinc powder replacement residues with dilute acid. The total percent recovery of gold(Ⅰ) and copper(Ⅰ) can reach 98.06% and 94.74%, respectively. The raffinates after the zinc powder replacement process can be used to produce zinc sulfide products. The total recovery of zinc reaches 96%. The suggested new process based on gas bubble supported organic liquid membrane extraction technology is economical and with a low processing cost. It is also environmental friendly, and might find potential industrial application in the future.
Key words: gold; solvent extraction; bubble; organic liquid membrane; auro-cyanide wastewater
