新型铜萃取剂对十二烷基苯基羧基甲酮肟的合成及其萃铜性能

Synthesis of a new organic extractant dodecylphenylcarboxymethyl ketone oxime and its application in copper extraction

基于羧羟基与肟基组合的原理,设计了一种新型铜萃取剂对十二烷基苯基羧基甲酮肟合成.采用核磁共振氢谱和红外光谱对合成物十二烷基苯基羧基甲酮肟萃取剂的结构进行了表征分析,并测试了其在应用于从硫酸铜溶液中萃取回收铜的性能.考察了有机相与水相的体积比(V_O∶V_A)、初始pH值、萃取时间等因素对铜回收率的影响,通过紫外-可见分光计测定Cu2+含量并计算得到萃取率.实验结果显示,在较优的条件下,即V_O∶V_A值为1∶2、水相初始pH值为1.5、萃取时间为5 min,萃取率可达99.61%.以硫酸为反萃取剂,对萃取Cu2+后的有机相进行反萃实验研究,结果表明:采用1 mol/L的硫酸在V_O∶V_A值为2∶1的条件下,可反萃回收45.64%的铜.

A new type of organic extractant（dodecylphenylcarboxymethyl ketone oxime） was synthesized based on the principle of combination of carboxy hydroxyl group and oxime group. The structure of the synthesized dodecylphenylcarboxymethyl ketoxime oxime extractant was characterized by 1 H NMR and IR spectra, and its properties were evaluated in the extraction and recovery of copper from copper sulfate solution. The effects of volume ratio（V_O∶V_A） of the organic phase to the aqueous phase, initial pH value and extraction time on the recovery of copper were investigated. The Cu2＋ content was determined by UV-VIS spectrophotometer and the extraction rate was calculated. The experimental results show that under the optimal conditions, V_O∶V_A is 1∶2,the initial pH is 1.5, the extraction time is 5 min, and the extraction rate is up to 99.61 %. The concentrated sulfuric acid was used as stripping agent to recover the Cu2＋ from the organic phase, and the results showed that 45.64 % copper could be recovered by stripping with 1 mol/L sulfuric acid and V_O∶V_A of 2∶1.