高位阻β-二酮从氨性蚀刻废液中萃取铜

采用高位阻β-二酮（1-（4’十二烷基）苯基-3-叔丁基-1,3-丙二酮）作为萃取剂从模拟印刷电路板（PCBs）蚀刻废液中萃取铜。利用离子强度与萃取反应平衡常数的关系校正模拟的萃取等温线,该模拟萃取等温线与实验测得萃取等温线基本相符。通过实验确定萃取剂浓度、相比、萃取级数和反萃级数等萃取工艺参数。结果表明,在室温下对于铜离子浓度为112g/L、总氨浓度为7mol/L的模拟氨性蚀刻废液的最佳萃取条件为：萃取剂浓度为40%,相比为5：4,萃取时间为5min。在此条件下,经过一级萃取,蚀刻废液中铜离子浓度可降低至63.24g/L,能返回到电路板的生产中循环使用。用含铜30g/L,硫酸浓度180g/L的模拟废电解液对负载有机相进行反萃,相比（O/A）为1：2,经一级反萃,铜的反萃率可达98.27%。

Recovery of copper from simulated ammoniacal spent etchant using sterically hindered beta-diketone

The solvent extraction of copper from simulated ammoniacal spent etchant with 1-(4′-dodecyl)-phenyl-3-tertiary butyl- 1, 3-octadione (HR) was studied, and a model of extraction isotherm was proposed and verified with equilibrium extraction constant. The influence of equilibration time, extractant concentration and phase ratio on the extraction of copper was studied at (298±0.5) K. For the spent etching solutions containing 112.98 g/L Cu, 6 mol/L NH₃ and 1 mol/L NH₄⁺, the optimal solvent extraction condition of copper was obtained in one-stage solvent extraction at phase ratio of 5:4 with 40% HR in sulphonated kerosene for 5 min. The copper concentration in the raffinate decreased to 63.24 g/L and raffinate can be favorably recycled to the etching solution. The stripping studies were carried out with the simulated copper spent electrolyte containing 30 g/L Cu and 180 g/L H₂SO₄. The stripping ratio is 98.27% from the loaded organic phase after one-stage stripping at phase ratio of 1:2 at (298±0.5) K.