(1. 中國科學(xué)院 青島生物能源與過程研究所，中國科學(xué)院生物基材料重點實驗室，青島 266100；
2. 青島理工大學(xué) 環(huán)境與市政工程學(xué)院，青島 266520；
3. 北京科技大學(xué) 冶金與生態(tài)工程學(xué)院，北京 100083；
4. 招金礦業(yè)股份有限公司 金翅嶺金礦，招遠 265400；
5. 江西省漢氏貴金屬公司，上饒 334000)
摘 要: 介紹一種鼓泡油膜萃取法處理氰化提金廢水的新方法。結(jié)果表明：鼓泡油膜萃取法不僅可回收廢水中高濃度的銅，還可經(jīng)濟回收極低濃度的金。廢水中銅的脫除率達99%，金的萃取率達99%，氰根脫除率達91.9%。萃余液可返回選礦工藝重復(fù)利用，實現(xiàn)含氰廢水的零排放。負載有機相經(jīng)酸性硫脲反萃后可循環(huán)使用。采用鋅粉置換法回收硫脲反萃余液中的金和銅。鋅粉置換渣采用稀酸溶解法可實現(xiàn)金和銅的分離。金的總回收率達98.06%，銅的總回收率達94.74%。鋅粉置換后液可制備硫化鋅產(chǎn)品，鋅回收率達96%。該工藝成本低，綠色環(huán)保，具有潛在的應(yīng)用推廣前景。
關(guān)鍵字: 金；溶劑萃取；鼓泡；有機液膜；氰化提金廢水
（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
