(1. 上海應(yīng)用技術(shù)大學(xué) 材料科學(xué)與工程學(xué)院，上海 201418；
2. 上海應(yīng)用技術(shù)大學(xué) 工程創(chuàng)新學(xué)院，上海 201418)
摘 要: 銅溶劑萃取時(shí)，萃取劑與硫酸溶液接觸將促發(fā)其降解。研究羥肟萃取劑LIX984N的酸解行為及其對(duì)萃取分相性能的影響。結(jié)果表明：酸降解使肟基結(jié)構(gòu)破壞，LIX984N中5-壬基水楊醛肟降解生成2-羥基-5-壬基苯甲醛、2-羥基-5-壬基乙酰苯酮肟降解生成2-羥基-5-壬基苯甲酮；有機(jī)相與濃硫酸溶液接觸30 h后，萃余液表面張力從56.4 mN/m降至38.1 mN/m，銅萃取分相速率明顯降低，萃余液中有機(jī)相夾帶量、溶解量顯著增大，有機(jī)相流失現(xiàn)象加重。研究發(fā)現(xiàn)夾帶是萃余液中有機(jī)相流失的主要形式，接觸50 h時(shí)夾帶量在有機(jī)相流失總量中占61%。
關(guān)鍵字: 銅溶劑萃取；羥肟萃取劑；降解；分相；萃余液夾帶
（1. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China;
(2. School of Engineering Innovation, Shanghai Institute of Technology, Shanghai 201418, China）
Abstract:The degradation of oxime extractants is triggered once contacted with sulfuric acid solution in copper solvent extraction practices. The degradation of LIX984N and its impacts on the phase disengagement in copper solvent extraction were investigated. The results show that the molecular structures of both oximes in LIX984N are broken due to degradation. The 5-nonyl salicyaldehyde oxime and 2-hydroxy-5-nonyl acetophenone oxime degrade to 2-hydroxy-5- nonyl benzaldehyde and 2-hydroxy-5-nonyl acetophenone, respectively. The surface tension of the raffinate decreases from 56.4 mN/m to 38.1 mN/m, and the phase disengagement speed drops down obviously when the organic phase is mixed with the strong sulfuric acid solution for more than 30 h. Meanwhile, the levels of the entrainment and dissolution of organic chemicals in the raffinate increase largely. As a result, the more organic chemicals loses during the course of solvent extraction. It is found that entraining is the main way for the losses of organic chemicals in the raffinate. The amount of organic chemicals loses by entrainment accounted for 61% for the total losses in 50 h.
Key words: copper solvent extraction; oxime extractant; degradation; disengagement; entrainment
